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KDC Proxy

Microsoft warns of 66 flaws to fix for this Patch Tuesday
Winsage
June 11, 2025

Microsoft warns of 66 flaws to fix for this Patch Tuesday

Microsoft has announced a significant update addressing 66 vulnerabilities, including a zero-day vulnerability disclosed on the same day. Ten critical patches have been identified, with two currently being exploited. Microsoft is also patching older platforms like Windows Server 2008 and Internet Explorer. One critical vulnerability, CVE-2025-33053, has been exploited by the Stealth Falcon hacking group since March, allowing remote code execution via the WebDAV extension. Another critical vulnerability, CVE-2025-5419, affects the Chromium V8 JavaScript engine in Microsoft Edge. CVE-2025-33073 is an escalation of privilege vulnerability in the Windows SMB Client, with a CVSS score of 8.8. Four critical vulnerabilities in Microsoft Office include CVE-2025-47162, CVE-2025-47164, CVE-2025-47167, and CVE-2025-47953. Four critical remote code execution vulnerabilities include CVE-2025-47172, CVE-2025-29828, CVE-2025-32710, and CVE-2025-33071. Two elevation-of-privilege flaws are CVE-2025-47966 and CVE-2025-33070. Adobe has prioritized fixes for Adobe Commerce and Adobe's Experience Manager, addressing 254 CVEs. Adobe Acrobat users will receive ten fixes, including four critical ones. Fortinet has patched CVE-2023-42788 in FortiAnalyzer 7.4. SAP resolved 14 issues, with CVE-2025-42989 being the only critical patch, associated with the NetWeaver Application Server and a CVSS score of 9.6.
Zero Day Initiative — CVE-2024-43639: Remote Code Execution in Microsoft Windows KDC Proxy
Winsage
March 5, 2025

Zero Day Initiative — CVE-2024-43639: Remote Code Execution in Microsoft Windows KDC Proxy

Integer overflows and memory corruption errors have been identified during the encoding of the kerb-message OCTET STRING field in the KDC Proxy. The ASN1encoder.buf is allocated a buffer of size 1,024, while ASN1encoder.current points to ASN1_encoder.buf + 4. The KDC Proxy accepts Kerberos responses with a maximum size of 4,294,967,295. When a Kerberos response is sent with a length from 4,294,967,291 to 4,294,967,295, an overflow occurs due to the addition being stored in a 4-byte unsigned variable, leading to a heap buffer overflow when ASN1BEREncCharString() calls memcpy(). Similarly, for responses with lengths between 4,294,966,267 and 4,294,967,290, an overflow occurs during reallocation, causing an out-of-bounds write or heap buffer overflow. An edge case arises when passing 0 as the new size to LocalReAlloc(), leading to an access violation. A remote, unauthenticated attacker could exploit this vulnerability for arbitrary code execution. Detection involves monitoring traffic on UDP port 389 and TCP port 88, focusing on Kerberos responses. If a response exceeds 0x80000000 bytes, it should be flagged as suspicious. The vulnerability was patched in November, and only KDC servers are at risk; domain controllers are unaffected. Immediate patching of all instances of the KPSSVC server is recommended.
Windows KDC Proxy RCE Vulnerability Let Attackers Control The Server Remotely
Winsage
March 5, 2025

Windows KDC Proxy RCE Vulnerability Let Attackers Control The Server Remotely

A critical remote code execution vulnerability, designated as CVE-2024-43639, has been identified in Microsoft’s Windows Key Distribution Center (KDC) Proxy. This flaw arises from an integer overflow due to a missing validation check for Kerberos response lengths, allowing unauthenticated remote attackers to execute arbitrary code with the privileges of the target service. The vulnerability specifically affects KDC Proxy servers and was addressed in a November 2024 security update by implementing necessary length validation checks. Organizations using remote authentication services reliant on the KDC Proxy, such as RDP Gateway or DirectAccess, are particularly at risk. Immediate patching is advised, and monitoring for potential exploitation attempts is recommended.
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