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Microsoft NTLM Zero-Day to Remain Unpatched Until April
Winsage
December 10, 2024

Microsoft NTLM Zero-Day to Remain Unpatched Until April

Microsoft has issued new guidance to help organizations defend against NTLM relay attacks following the discovery of a zero-day vulnerability affecting all versions of Windows Workstation and Server, from Windows 7 to Windows 11. This vulnerability allows attackers to capture NTLM credentials by tricking users into opening a malicious file. Microsoft has classified the vulnerability as having moderate severity and expects a fix to be rolled out in April. This is the second NTLM credential leak zero-day reported to Microsoft by ACROS Security since October. Microsoft has updated its guidance on enabling Extended Protection for Authentication (EPA) by default on LDAP, AD CS, and Exchange Server to mitigate NTLM-related vulnerabilities.
Critical Windows Zero-Day Alert: No Patch Available Yet for Users
Winsage
December 10, 2024

Critical Windows Zero-Day Alert: No Patch Available Yet for Users

A newly identified zero-day vulnerability in Windows allows attackers to steal NTLM credentials through methods such as opening a malicious file in Windows Explorer. This vulnerability affects multiple versions of Windows, including Windows Server 2022, Windows 11 (up to v24H2), Windows 10, Windows 7, and Server 2008 R2. The exploitation requires minimal user interaction, such as accessing shared folders or USB disks. In response, 0patch is providing a complimentary micropatch to registered users until Microsoft issues an official fix. The vulnerability is part of a larger trend of unresolved issues in Windows, and cybersecurity experts emphasize the need for enterprises to adopt robust security measures beyond automated patch management.
New Windows 7 To 11 Warning As Zero-Day With No Official Fix Strikes
Winsage
December 7, 2024

New Windows 7 To 11 Warning As Zero-Day With No Official Fix Strikes

A zero-day vulnerability has been discovered by researchers at Acros Security, affecting all versions of Windows from 7 to 11 and Windows Server 2008 R2 and later. This vulnerability targets the Windows NT LAN Manager and allows attackers to obtain a user's NTLM credentials by having the user view a malicious file in Windows Explorer. Currently, there is no official patch from Microsoft. The 0patch platform has released a free "micropatch" for users to protect their systems until an official fix is available.
Micropatchers share fix for NTLM hash leak flaw in Windows
Winsage
December 7, 2024

Micropatchers share fix for NTLM hash leak flaw in Windows

Acros Security has identified an unpatched NTLM vulnerability in Microsoft Windows, affecting versions from Windows 7 to Windows 11 v24H2, which risks credential theft. The vulnerability can be exploited through Windows Explorer when users view a malicious file, exposing their NTLM hash to remote attackers. Acros plans to release a micropatch to mitigate the risk and has contacted Microsoft regarding the issue. Historically, Acros has reported several zero-day vulnerabilities to Microsoft. The micropatching industry aims to provide more permanent solutions to security flaws, though it may introduce complications. As Windows 10 approaches retirement, IT managers may increasingly consider micropatching for system protection. Mainstream support for Windows 7 ended in 2015, with extended support concluding in 2020.
New Windows Theme Zero-Day Vulnerability Let Attackers Steal Credentials
Winsage
October 31, 2024

New Windows Theme Zero-Day Vulnerability Let Attackers Steal Credentials

Security researchers at Acros have identified a new zero-day vulnerability (CVE-2024-38030) related to Windows theme files that can lead to the potential exposure of NTLM credentials. This vulnerability affects multiple Windows platforms, including Windows 11 (version 24H2). The issue arises when a theme file specifies a network file path for certain properties, causing Windows to send authenticated network requests to remote hosts, which can result in credential leaks if a malicious theme file is used. Microsoft issued a patch for an earlier related vulnerability (CVE-2024-21320), but researchers found it insufficient for systems that had stopped receiving updates. A more comprehensive patch has been developed by researchers to address all execution paths that could lead to credential leaks, and users of the micropatch service 0patch are currently protected against this vulnerability. The micropatches are available for all supported Windows versions and some legacy versions, specifically for Windows Workstation, and not for Windows Server.
Windows Themes 0-day opens door to NTLM credential theft
Winsage
October 31, 2024

Windows Themes 0-day opens door to NTLM credential theft

A new zero-day vulnerability has been identified that targets Windows Themes, allowing attackers to steal NTLM credentials. Acros Security has released a complimentary micropatch to address this issue. The vulnerability, identified as CVE-2024-38030, allows exploitation through a malicious theme file that tricks users into transmitting their NTLM credentials. This flaw affects all fully updated Windows versions, including Windows 11 24H2. Acros Security has reported the vulnerability to Microsoft and has created micropatches for both legacy and currently supported Windows versions. User interaction is required for the exploit to be successful, such as downloading the malicious theme file from an email or website. Users are advised to apply the micropatches promptly to improve their security.
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