Ntlm authentication vulnerability.

Ntlm authentication vulnerability Feb 14, 2025 · On January 13, 2025, a critical elevation of privilege vulnerability, CVE-2025-21311, was discovered in the NTLMv1 authentication protocol used by Windows. However, over the years, several vulnerabilities and Apr 23, 2020 · New vulnerabilities that expose the network to NTLM Relay are constantly being discovered. Legacy Systems : For businesses still relying on older applications or systems that only support NTLM, this change could necessitate updates or replacements. This will reduce the risk of fallback scenarios where NTLM is unintentionally used. NTLM Relay is an attack that exploits the inability to provide mutual authentication. Mar 6, 2024 · Akamai security researcher Tomer Peled recently discovered a spoofing vulnerability in Microsoft Themes. While this technique has been known among pentesters and security professionals for years, its recent public disclosure by the 0patch team highlights the urgency for organizations to address the risks posed by legacy protocols like NTLM. Feb 14, 2023 · GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. NTLM relay is a common attack technique where an attacker that compromises one machine can move laterally to other machines by using NTLM authentication directed at the compromised server. This vulnerability enables remote exploitation over the internet, allowing attackers with minimal knowledge of the system to exploit it. NTLM blocking is also required for forcing an organization's authentication to Kerberos, which is more secure because it verifies identities with its ticket system and Organizations running outdated Windows systems or relying on NTLM authentication face significant risks from unpatched vulnerabilities. 1. There are different ways to exploit duplicate challenges, including: (i) An attacker A can eavesdrop network traffic looking for NTLM authentication messages exchanged between client C and server S ('SMB Negotiate Protocol Requests' packets and 'SMB Negotiate Protocol Responses' packets), storing challenges and their corresponding responses. Apr 18, 2025 · “This vulnerability is triggered when a user extracts a ZIP archive containing a malicious . Nov 21, 2024 · In the face of Microsoft’s limited action on NTLM vulnerabilities, businesses must take steps to protect themselves. A critical 0-click remote authentication bypass vulnerability in Microsoft Telnet Server that allows attackers to gain access as any user, including Administrator, without requiring valid credentials. is a legacy authentication protocol that Microsoft includes A new zero-day vulnerability in NTLM discovered by researchers at 0patch allows attackers to steal NTLM credentials by having a user view a specially crafted malicious file in Windows Explorer Feb 17, 2021 · This blog post will explain NTLM’s main security weaknesses. Microsoft has disclosed a high-severity vulnerability affecting Office 2016 that could expose NTLM hashes to a remote attacker. As recently as February, for instance, Microsoft issued a patch for an NTLM that has disclosure vulnerability CVE-2025-21377. NTLM Background. This typically prevents the authentications coerced via the PrinterBug or Petit Potam from being relayed. Mar 24, 2023 · CVE-2023-23397 is a critical zero-day vulnerability with a CVSS score of 9. Mar 24, 2023 · To address this vulnerability, you must install the Outlook security update, regardless of where your mail is hosted (e. Over time, the protocol evolved with the emergence of NTLMv2, attempting to address growing vulnerabilities in the original version. ” The vulnerability arises from a misconfiguration in how the Telnet server handles NTLM authentication processes. This is the most severe combination of security factors that exists and it is extremely important to find it on your network and fix it as soon as possible. certipy relay -ca ca. Coerced authentication is a procedure where the attackers trigger a remote authentication to a compromised machine. There are several authentication mechanisms that the SMB protocol uses to ensure secure and authorized access to shared resources. It’s been discovered that someone can crack any password under 8 characters through an NTLM vulnerability. One of the analyzed samples contained the following crucial code snippet: Apr 30, 2025 · There is a 0-Click NTLM Authentication Bypass vulnerability in the Microsoft Telnet Server. NTLM Relay Attack. Apr 30, 2025 · There is a 0-Click NTLM Authentication Bypass vulnerability in the Microsoft Telnet Server. The vulnerability affects a wide range of Windows editions from Windows 7 and Server 2008 R2 up to the latest iterations of Windows 11 and Windows Server. Though Microsoft has been urging customers to jettison NTLM because of its flaws, many Jun 23, 2022 · In this scenario, we assume the client trusts the site requesting authentication and sends an NTLM NEGOTIATE_MESSAGE through the “Authorization” header. 1 at the endpoint https: Apr 16, 2025 · Both vulnerabilities highlight persistent weaknesses in NTLM authentication, despite Microsoft’s efforts to bolster security with NTLMv2, which mitigates older risks like pass-the-hash and rainbow table attacks. In large organizations, a single NTLM vulnerability has the potential to compromise entire trust domains, eroding the fundamental security boundaries on which network segments and access policies depend. In its essence, the flaw is triggered when a user opens a specially crafted file in Windows Explorer. The flaw could expose NTLM credentials, putting users at risk. Related: Microsoft Improving Windows Authentication, Disabling NTLM. To prevent NTLM Relay Attacks on networks with NTLM enabled, domain administrators must ensure that services that permit NTLM authentication make use of protections such as Extended Protection for Authentication (EPA) or signing features such as SMB signing. Jan 14, 2025 · Specifically, the vulnerability arises from how specific /Launch actions are processed by Adobe Reader and Foxit Reader. library-ms and SCF (Shell Command File) files. , by opening a shared folder or USB disk The second zero-day vulnerability found in Windows NTLM in the past two months paves the way for relay attacks and credential theft. Relaying the authentication against a vulnerable target. Feb 9, 2010 · Workarounds for SMB NTLM Authentication Lack of Entropy Vulnerability - CVE-2010-0231. 0, multiple out-of-bounds reads when decoding NTLM fields can trigger a denial of service. Regular updates and patching are critical for protecting against security threats, particularly for preventing exploitation of NTLM weaknesses. Apr 30, 2025 · A dangerous vulnerability in Microsoft’s Telnet Server has surfaced, and it’s a doozy for anyone still running older Windows systems. When the attackers capture the network login on the compromised machine, they can use this authentication to perform: Oct 22, 2024 · Successfully exploiting CVE-2024-43532 results into a new way to carry out a NTLM relay attack, one that leverages the WinReg component to relay authentication details that could lead to domain Dec 8, 2024 · This zero-day NTLM authentication exploit isn't the only one found and reported to Microsoft by 0Patch recently — 0Patch also mentions three non-NTLM zero-day vulnerabilities and three other Jan 14, 2025 · CVE-2025-21217 is a NTLM Spoofing Vulnerability. The NTLM authentication protocol does not support multi-factor authentication (MFA), so it is sufficient to retrieve a password hash. Apr 22, 2025 · NTLM’s reliance on the challenge-response process minimizes the risk of transmitting plaintext passwords but does not fully eliminate credential vulnerabilities, as it is still susceptible to attacks like NTLM relay, where an attacker intercepts the authentication handshake and uses the client’s response to authenticate to the server. For Windows NT, two options are supported for challenge response authentication in network logons: LAN Manager (LM) challenge response and Windows NT challenge response (also known as NTLM version 1 challenge response). Aug 15, 2024 · Explore the critical security risks of NTLM as Microsoft phases out this outdated protocol. The new vulnerability is tracked as CVE-2023-35636. On October 8, 2019, aka Patch Tuesday, Microsoft released patches for CVE 2019-1166 and CVE-2019-1338 — two important vulnerabilities discovered by Preempt (now CrowdStrike): CVE 2019-1166: This vulnerability allows attackers to bypass the MIC (message integrity code) protection on NT LAN Manager (NTLM) authentication and thereby modify Dec 10, 2024 · In a chilling turn of events for Windows users and IT administrators alike, a new zero-day vulnerability has been discovered within the Windows NTLM authentication protocol. An NTLM relay attack typically involves two steps: Coercing a victim to authenticate to an arbitrary endpoint. Since NLTM is based on passwords, it’s unable to provide authentication for Multi-Factor Authentication (MFA) and smart cards. Nov 28, 2023 · Should the victim open the file and click the linked table, the victim client contacts the attacker-controlled server for authentication, enabling the latter to pull off a relay attack by launching an authentication process with a targeted NTLM server in the same organization. It has been assigned an ‘important’ severity rating by Microsoft, which fixed it with its December 2023 Patch Tuesday Dec 20, 2024 · NTLM has long been a staple in Windows' authentication mechanism, dating back to the early days of Windows NT (1993). According to ACROS Security, this new vulnerability is similar to CVE-2024-38030 and could enable hackers to launch authentication coercion attacks. Apr 26, 2021 · Authentication will be relayed to a privileged resource such as LDAP, SMB, HTTP or other. Once attackers obtain NTLM hashes, they can impersonate users without needing plaintext passwords. Microsoft no longer recommends deployment of NTLM in modern systems, yet Mar 15, 2023 · Among the latest set of patches released by Microsoft, a fix for CVE-2023-23397 is available to fix an NTLM vulnerability in Outlook for Windows clients. In less geeky terms, it’s a bug that lets attackers trick NTLM authentication systems into believing a fraudulent source is legitimate. Perform Patching and System Updates Regularly: Ensure all systems and applications are consistently updated to address security vulnerabilities, including those affecting NTLM authentication. Related: New NTLM Hash Leak Attacks Target Outlook, Windows Programs. Encapsulate and forward the authentication in a protocol already implemented and supported in ntlmrelayx[12], e. 8 that affects Microsoft Outlook, allowing an attacker to access a user's Net-NTLMv2 challenge-response authentication hash and impersonate the user leveraging the NTLM Relay attack technique [4]. NTLM is an older authentication method that has its roots in earlier Windows systems, and while it's still in use today, Microsoft recommends migrating to more secure alternatives like Kerberos. Imagine handing our trusty NTLM security guard a photocopied ID card. Request a user certificate for further authentication in the domain. NT LAN Manager (NTLM) - NTLM, an outdated authentication protocol, is used in legacy Windows and SMB versions. Jan 22, 2024 · Data security firm Varonis has disclosed a new vulnerability and three attack methods for obtaining NTLM v2 hashes by targeting Microsoft Outlook and two Windows programs. PetitPotam and NTLM Relay. If exploited by a malicious actor, these behaviors could enable the theft of NTLM information a key authentication mechanism in Windows networks. " Dec 9, 2024 · NTLM relaying is a popular attack method used by threat actors that allows for identity compromise. Feb 21, 2025 · This is why Microsoft announced last year that the NTLM authentication protocol won’t be supported in future versions of Windows 11. The server then responds with a Challenge message, which includes a random number (the challenge) for the client to hash using its credentials. It was assigned CVE-2024-21320 with a CVSS score of 6. The vulnerability could have allowed an attacker to leak the NTLM credentials of the OPA server's local user account to a remote server, potentially allowing the attacker to relay the authentication or crack the password. The vulnerability presented in this article is especially dangerous, as any server that configured to use NTLMv1 authentication is expose to it. The vulnerability exploits a misconfiguration in the NTLM Authentication processes of the Telnet MS Aug 23, 2024 · Blocking NTLM authentication prevents tricking clients into sending NTLM requests to malicious servers, which counteracts brute force, cracking, relay, and pass-the-hash attacks. Prior to version 1. This marks the second such flaw identified in the past two months, and it poses significant risks for corporate networks. Mar 24, 2025 · The NTLM protocol doesn't, however, guarantee server identity. NTLM relay has always been a popular attack technique. NTLM’s outdated cryptography and lack of modern security features make it susceptible to attacks that include credential theft and relay attacks and pose a PetitPotam is a coerced authentication vulnerability. Sep 5, 2019 · The Preempt research team found two critical vulnerabilities in Microsoft, sourced in three logical flaws in NTLM, Microsoft’s authentication protocol. I discovered that the patch for CVE-2024-38200 was not applied correctly. 0 CVSS Version 3. While NTLMv2 offers improved security over earlier versions, vulnerabilities still exist, especially when attackers can manipulate how hashes are transmitted or disclosed. Sep 15, 2022 · Without this signature, the authentication will fail. This blog was originally published on October 8, 2019. This can be done by unchecking "Integrated Windows Authentication" within "Authentication Method" under "Directory Security" in "Default Web Site Properties". Dec 6, 2024 · A new zero-day vulnerability has been discovered that allows attackers to capture NTLM credentials by simply tricking the target into viewing a malicious file in Windows Explorer. Jan 16, 2025 · To mitigate the risk posed by NTLMv1, it's essential to enable audit logs for all NTLM authentication in the domain and keep an eye out for vulnerable applications that request clients to use NTLMv1 messages. 6. 5. However, NTLM overall has increasingly become a legacy feature. Here we had two paths that we could have followed: Implement in ntlmrelayx a “minimalistic” RPC server with the impacket libs [11]. Jan 17, 2025 · Researchers discovered a new NTLM vulnerability exploited by Russian threat actors that allows attackers to leverage weaknesses in NTLM authentication to deliver the Spark RAT malware. NTLM is a rather veteran authentication protocol and quite vulnerable for relatively easy to initiate attacks. Dec 6, 2024 · As we have seen in the past, using NTLM for authentication comes with significant vulnerabilities that are actively exploited in various cyber attacks. library-ms files is now actively exploited by hackers in phishing campaigns targeting government entities and private companies. Resolves a vulnerability in the Microsoft Telnet service protocol that could allow an attacker to use credentials obtained to log back into affected systems. All versions of Windows clients, from Windows 7 through current Windows 11 versions, contain a 0-day vulnerability that could allow attackers to capture NTLM authentication hashes from users of Mar 24, 2023 · This blog post details the findings of our tests, along with the background information about Window’s NTLM required for context. NTLM relay attack. 20114 and determined that the vulnerability can still be exploited as shown below CVE-2024-43609. g. Nov 6, 2024 · How It Works: The vulnerability arises when an attacker can position themselves in the network to intercept and relay NTLM authentication attempts. May 14, 2022 · Raphael John, who Microsoft attributes for the discovery of the new NTLM Relay vulnerability, says that he discovered that PetitPotam was still working when conducting pentests in January and March. The update closes a hole where attackers can use specially formatted messages to force NTLM credentials to be sent outside the organization. Mar 26, 2025 · A critical vulnerability affecting all Windows operating systems from Windows 7 and Server 2008 R2 through the latest Windows 11 v24H2 and Server 2025. Mar 4, 2024 · The stolen NTLM hashes could potentially be exploited for password cracking or to facilitate “Pass-The-Hash” attacks within targeted organizations. This zero-day NTLM authentication exploit isn't the only one found and reported to Microsoft by 0Patch recently — 0Patch also mentions three non-NTLM zero-day vulnerabilities and three other NTLM authentication protocol is susceptible to relay attacks. Using NTLM relay techniques, they can then For example, by default, Windows XP and Windows Server 2003 both support NTLMv1 authentication. After the patch was published, I tested the vulnerability against Office 2019 Volume Licensed: Version 1808 (Build 10413. Nov 12, 2024 · This vulnerability allows attackers to potentially spoof NTLM hash values, which could lead to unauthorized access to sensitive resources. Exploitation in the Wild Nov 26, 2024 · Suspected NTLM authentication tampering (external ID 2039) Severity: Medium. 20020) and Microsoft 365 MSO 2408 Build 16. NTLM is Microsoft’s suite of security protocols that provide authentication, integrity, and confidentiality to end users. A 32-bit integer overflow condition can lead to incorrect checks of consistency of length of internal buffers. The vulnerability can trigger an authentication coercion — an attack in which a victim is coerced into sending credentials (usually in the form of NTLM hashes over SMB) to an attacker’s machine. By downgrading the HTTP protocol from HTTP/2 to HTTP/1. Mar 27, 2025 · Because, Kolsek explained, his researchers uncovered a vulnerability that “allows an attacker to obtain user's NTLM credentials by having the user view a malicious file in Windows Explorer. Despite known vulnerabilities, NTLM remains widely deployed even on new systems in order to maintain compatibility with legacy clients and servers. Vulnerability Description. Understanding the Vulnerability This zero-day takes advantage of how Windows handles NTLM authentication. The child signature, 35364, is looking for an SMB Negotiate (0x72) request. Still, all organizations should understand the vulnerabilities in the Kerberos authentication process and take steps to block, detect and recover from attacks involving the protocol. Jan 17, 2025 · NTLM (New Technology LAN Manager) is an authentication protocol widely used in Windows environments. 0patch's Response and What Users Should Do In light of the imminent risk posed by this zero-day, 0patch has decided not to release specific technical details about the vulnerability until Apr 27, 2025 · The reach of CVE-2025-24054 extends across all environments where NTLM lingers as part of the authentication stack. As mentioned previously, when a web server prompts Internet Explorer and Edge for NTLM credentials, in its default configuration it will do the challenge-response authentication procedure and send the logged-in user’s hash to the requesting server, provided the site’s domain is sitting in the corporate intranet or is Dec 7, 2024 · “The vulnerability allows an attacker to obtain user's NTLM credentials by simply having the user view a malicious file in Windows Explorer,” Mitja Kolsek, founder of Acros security which Nov 21, 2023 · SMB authentication methods. Relay the credentials to the Active Directory Certificate Services (ADCS). Here are several recommendations: Restrict NTLM Usage: Use Group Policy to limit or disable NTLM authentication (Network security: Restrict NTLM). The flaw stems from the external control of file names or paths influencing the NTLM authentication process, thereby allowing an attacker to leak the victim Aug 3, 2021 · In general, to prevent NTLM relay attacks on networks with NTLM enabled, domain administrators should ensure that services that permit NTLM authentication make use of protections such as Extended Protection for Authentication (EPA) coupled with “Require SSL” for affected virtual sites, or signing features such as SMB signing. Oct 22, 2024 · This insecure configuration allows attackers to intercept and relay the client’s NTLM authentication details. This event will trigger Windows Explorer to initiate an SMB authentication request to a remote server and, as a result, it leaks the user’s NTLM hash without any user interaction,” the cybersecurity firm notes. The attacker would then acquire user rights on a system. 17928. , Exchange Online, Exchange Server, some other platform) or your organization’s support for NTLM authentication. . What is the scope of the vulnerability? This is an elevation of privilege vulnerability. Microsoft has not identified any workarounds for this vulnerability. Dec 10, 2024 · “The vulnerability allows an attacker to obtain user’s NTLM credentials by simply having the user view a malicious file in Windows Explorer – e. Nov 30, 2021 · Simply put, NTLM authentication is a huge security vulnerability that’s still being exploited in organizations around the world — and a risk you can minimize or even eliminate in pretty short order. Dec 6, 2024 · The NTLM protocol, used for authentication in Windows environments, is susceptible to “pass-the-hash” attacks. 0patch's Response and What Users Should Do In light of the imminent risk posed by this zero-day, 0patch has decided not to release specific technical details about the vulnerability until Apr 21, 2023 · In this guide on NTLM, Microsoft's authentication protocol, we explore its three-step process and delve into various attacks like 'Pass the Hash' and NTLM Relay. However, its first version, NTLMv1, is known for its severe security vulnerabilities, including susceptibility to brute-force attacks, credential theft, and relay attacks. Apr 21, 2023 · In this guide on NTLM, Microsoft's authentication protocol, we explore its three-step process and delve into various attacks like 'Pass the Hash' and NTLM Relay. Apr 29, 2025 · According to the report, “a critical 0-click remote authentication bypass vulnerability in Microsoft Telnet Server allows attackers to gain access as any user, including Administrator, without requiring valid credentials. Attackers that successfully exploit this vulnerability have the ability to downgrade NTLM security features and successfully create authenticated session on behalf of other account. It also goes without saying that organizations are recommended to keep their systems up-to-date. Apr 27, 2025 · Anatomy of the Windows NTLM Vulnerability CVE-2025-24054 NTLM, once a ubiquitous authentication protocol in Windows networks, is known for several inherent security weaknesses that have been long recognized by security professionals. These vulnerabilities remain unpatched on fully updated Windows systems and pose a potential risk to organizations using NTLM authentication. The issue was identified while patching another vulnerability also Oct 31, 2024 · NTLM relay attack method. Jan 16, 2025 · The process begins with the client sending a Negotiate message to the server, indicating its intent to use NTLM for authentication and providing information about supported authentication options. Since NTLM is a binary protocol the message is both encoded with base64 so it can be transported over an HTTP connection and prefaced with NTLM to specify the authentication protocol used. Jan 14, 2025 · Microsoft has disclosed a new vulnerability under the identifier CVE-2025-21311, which specifically targets the security mechanism within NTLMv1 (NT LAN Manager version 1), leading to something we tech nerds call "elevation of privilege. Learn why transitioning to secure authentication methods like Kerberos is crucial for protecting your organization against modern cyber threats, and how gaining visibility into NTLM usage within your network can enhance your security posture. This could allow a malicious user to obtain another user's NTLM authentication credentials without the user's knowledge. Vulnerabilities in IIS Allows BASIC and/or NTLM Authentication is a Low risk vulnerability that is also high frequency and high visibility. By exploiting this vulnerability, an attacker can: Intercept the NTLM authentication attempt. Over the years, Microsoft has developed several mitigations for thwarting such NTLM relay attacks. Jan 16, 2021 · disable NTLM authentication for your Web server. 2. This week, Acros Security reported the discovery of a SCF File NTLM Hash Disclosure Vulnerability (zero-day) resulting in NTLM hash leaks. 0. The fact that it is not secure, doesn’t make it easier to move to a better protoco Mar 14, 2023 · To address this vulnerability, you must install the Outlook security update, regardless of where your mail is hosted (e. Sep 26, 2018 · Microsoft Windows SMB NTLM Authentication Lack of Entropy Vulnerability: If a session has same source and same destination but triggers our child signature, 35364, 20 times in 10 seconds, we call it a possible a brute force attempt. Jun 26, 2024 · Tracked as CVE-2024-5806, the vulnerability has a CVSS score of 9. corp. The recent PetitPotam attack is a good example. Related: Organizations Warned About DoS Flaws in Popular Open Source Message Brokers. May 31, 2024 · The attack involves relaying NTLM authentication from a compromised machine to an AD CS server, which can be done using tools like Certipy. Let’s break this down: Feb 2, 2024 · An authentication relay attack is a type of attack in which the threat actor intercepts an NTLM v2 authentication request and forwards it to a different server. Oct 31, 2024 · for admins running Windows 10 or 11, see Network security: Restrict NTLM: Outgoing NTLM traffic to remote servers Network security: Restrict NTLM: Add remote server exceptions for NTLM authentication. In Mar 25, 2025 · Free unofficial patches are available for a new Windows zero-day vulnerability that can let remote attackers steal NTLM credentials by tricking targets into viewing malicious files in Windows No support for multi-factor authentication . Dec 18, 2017 · Scenario #2: XSS: alert(1) is boring, let’s get some Net-NTLM hashes. For example, by default, Windows XP and Windows Server 2003 both support NTLMv1 authentication. Dec 13, 2024 · This change will significantly reduce the attack surface and prevent potential exploits that could otherwise take advantage of NTLM's vulnerabilities. A second factor such as an authenticator app, a hardware OTP token or an SMS is generally not used. NTLM has been extensively exploited Sep 5, 2019 · The Preempt research team found two critical vulnerabilities in Microsoft, sourced in three logical flaws in NTLM, Microsoft’s authentication protocol. local Sep 5, 2024 · The CVE-2024-30081 vulnerability reported in Microsoft’s Security Update Guide highlights a critical security flaw in the NTLM authentication protocol used by Windows. This zero-day flaw enables attackers to capture users’ NTLM authentication credentials simply by having them view a malicious file in Windows Explorer. 0patch currently protects about 40% of its users against both zero-days and vulnerabilities Microsoft no longer supports. Sep 14, 2000 · A vulnerability exists because the client will, by default, perform NTLM authentication when connecting to the remote telnet server. NTLM authentication is also vulnerable to NTLM A steady stream of NTLM-related vulnerabilities has exacerbated the issue. While NTLM is still supported by Microsoft, it has been replaced by Kerberos as the default authentication protocol in Windows 2000 and subsequent Active Directory (AD) domains. In this blog, I’ll explain what NTLM authentication is and the security concerns that come with using it. The signature cannot be stripped in transit due to NTLM including a Message Integrity Code (MIC) for the full NTLM negotiation. From common attack techniques to specific vulnerabilities. A proof of concept (PoC) has since been published, but there is no patch. This primarily defends against brute-force or dictionary attacks on NTLM credentials and protects Windows environments from unauthorized access. Implementing Jul 17, 2019 · Specifically, when “man-in-the-middle” attacks are able to successfully bypass NTLM MIC (Message Integrity Check) protection. The attacker can then use the obtained certificate to authenticate to services that require NTLM signing, overcoming the limitations of NTLM relay attacks. As with all protocols that use NTLM for authentication, an attacker with access to a domain-joined computer's machine account could invoke the domain controller to compute an NTLM session-key and impersonate the server. The linked article headlines in the screenshot above that Microsoft Telnet is vulnerable to a 0-click vulnerability and requires immediate action. 0 Sep 9, 2021 · While NTLM relay attacks are far from new, researchers and malicious actors continue to find novel ways to exploit this authentication protocol. Hope you have a nice day : ) Gloria ===== Apr 17, 2025 · A Windows vulnerability that exposes NTLM hashes using . The SMB implementation in the Server service in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 does not use a sufficient source of entropy, which allows remote attackers to obtain access to files and other SMB resources via a large number of authentication requests Oct 29, 2024 · Free unofficial patches are now available for a new Windows Themes zero-day vulnerability that allows attackers to steal a target's NTLM credentials remotely. Oct 9, 2019 · Two security vulnerabilities in Microsoft's NTLM authentication protocol allow attackers to bypass the MIC (Message Integrity Code) protection and downgrade NTLM security features leading to full Jan 14, 2025 · Internal information disclosure using hidden NTLM authentication. Mar 8, 2020 · NTLM authentication can be found embedded in alternate application protocols such as: The recommended remediation for this vulnerability is to disable NTLM authentication over HTTP in the IIS All versions of Windows clients, from Windows 7 through current Windows 11 versions, contain a 0-day vulnerability that could allow attackers to capture NTLM authentication hashes from users of Mar 19, 2025 · The threat of NTLM hash leakage in both consumer and enterprise settings adds a new dimension to the ongoing debate about modernizing authentication protocols. Mar 18, 2025 · The zero‑day vulnerability exploits a long‑standing weakness in Windows’ NTLM (NT LAN Manager) protocol—a core component used to authenticate and secure network communications. Description:. It uses a challenge-response system, with the server sending a random Feb 13, 2024 · NTLM (NT LAN Manager) is a suite of Microsoft security protocols that provides authentication, integrity, and confidentiality to users. In June 2019, Microsoft published Security Vulnerability CVE-2019-1040, announcing discovery of a new tampering vulnerability in Microsoft Windows, when a "man-in-the-middle" attack is able to successfully bypass NTLM MIC (Message Integrity Check) protection. Active exploitation in the wild has been observed since March 19, 2025 , potentially allowing attackers to leak NTLM hashes or user passwords and compromise systems. This flaw highlights ongoing risks tied to NTLM’s inherent vulnerabilities. Apr 16, 2025 · NTLM is a suite of authentication protocols developed by Microsoft to verify user identities and secure network communications. Mar 31, 2023 · One of the most significant security vulnerabilities of NTLM authentication is its susceptibility to relay attacks. This is an improper authentication vulnerability that exists in the SFTP module of the MOVEit Transfer. Feb 10, 2010 · Description . HTTP. Dubbed the “0-Click NTLM Authentication Bypass,” this flaw lets attackers remotely sidestep authentication and take full control of a system, no password needed. library-ms file. The vulnerabilities potential outcome is allowing remote execution of malicious code on any Windows machine in all versions. Related: Microsoft Word subDoc Feature Allows Password Theft Aug 9, 2024 · Update with further information from Microsoft. Detailed Authentication Information: Logon Process: NtLmSsp Authentication Package: NTLM Transited Services: - Package Name (NTLM only): NTLM V1 Key Length: 128 When I set the registry value to 3 or higher on the client server prior to connection, the Package Name value becomes NTLM V2. Users are recommended to follow these steps Jul 27, 2021 · Such attacks take advantage of the security vulnerabilities in NTLM as a method for authentication. FAQ for SMB NTLM Authentication Lack of Entropy Vulnerability - CVE-2010-0231. Dec 6, 2024 · The team also highlighted three NTLM-related vulnerabilities, PetitPotam, PrinterBug/SpoolSample, and DFSCoerce that are publicly known but classified as “won’t fix” by Microsoft. Dec 10, 2024 · The vulnerability has yet to be patched by Microsoft. The victim's machine will then send the authentication response to the attacker's server, and the attacker can use that information to authenticate to the victim's intended server. NTLM-based authentication is disabled by default. Apr 27, 2025 · The NTLM Vulnerability: Technical Insights and Threat CVE-2025-24054 involves an NTLM hash-leaking vulnerability tied to Windows handling of . 4 Exploiting duplicate challenges. Mar 31, 2025 · The SMB NTLM Authentication Rate Limiter is a security feature in Windows that limits NTLM-based authentication traffic over the Server Message Block (SMB) protocol. Indicators suggest the use of the open-source toolkit Impacket on the SMB servers, a practice uncommon in standard SMB environments. Oct 22, 2024 · Tenable Research discovered an SMB force-authentication vulnerability in Open Policy Agent (OPA) that is now fixed in the latest release of OPA. Successful exploitation of the vulnerability may lead to an authentication bypass. ” Jan 14, 2025 · Windows NTLM V1 Elevation of Privilege Vulnerability Metrics CVSS Version 4. In a relay attack, an attacker intercepts the NTLM authentication messages sent between the client and server and relays them to a third-party server, such as a domain controller, to gain access to network resources. Jun 30, 2022 · In this blog, we detail the fix, the remaining issues and an enhancement to Falcon Identity Protection's existing NTLM relay detection, which detects exploitation of the PetitPotam vulnerability and similar authentication coercion techniques. x CVSS Version 2. Understanding the Windows SMB NTLM Authentication Weak Nonce Vulnerability BlackHat USA 2010 Vulnerability Information ‣ Flaws in Windows’ implementation of NTLM-attackers can access SMB service as authorized user-leads to read/write access to files, SMB shared resources in general and remote code execution ‣ Published February 2010 On Patch Tuesday, January 12, 2021, Microsoft released a patch for CVE-2021-1678, an important vulnerability discovered by CrowdStrike® researchers. This vulnerability allows for potential spoofing attacks, making systems that rely on NTLM verification susceptible to unauthorized access and data breaches. MOVEit Transfer is a managed file transfer (MFT) solution available in an on-premises Jan 3, 2022 · Discontinuing use of NTLM in favor of Kerberos authentication is a proven way to improve the security of your IT environment. Mar 26, 2025 · Key points of the vulnerability: It stems from how NTLM hashes are handled in SCF files. NTLM (New Technology LAN Manager) is a suite of authentication protocols from Microsoft that many organizations use to enable single sign-on to enterprise applications and services. Techniques like reconnaissance, credential validation, and hash retrieval are examined, highlighting NTLM's role in network security. Critics of NTLM have long pointed out its inherent vulnerabilities; CVE-2025-24071 reinforces the need for updating legacy protocols and applying holistic security measures. This vulnerability allows an attacker to relay NTLM authentication sessions to an attacked machine, and use a printer spooler MSRPC interface to remotely execute code on the attacked machine. Sep 25, 2023 · To mitigate NTLM vulnerabilities, consider adopting these proactive measures: Surveillance of NTLM Usage: Regularly scrutinize NTLM authentication logs, pinpointing irregularities or Apr 16, 2025 · CVE-2025-24054 is a vulnerability related to NTLM hash disclosure via spoofing, which can be exploited using a maliciously crafted . jchjqx axvica vthf ahhgfvi ywlt gesilp qhfwrjrc vsqh mgwrq kwce
  • Contact
  • Accessibility Policy