{"id":85549,"date":"2025-11-03T14:54:06","date_gmt":"2025-11-03T14:54:06","guid":{"rendered":""},"modified":"2025-11-11T11:04:05","modified_gmt":"2025-11-11T17:04:05","slug":"cve-2025-54895-critical-integer-overflow-vulnerability-in-windows-spnego-extended-negotiation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-54895-critical-integer-overflow-vulnerability-in-windows-spnego-extended-negotiation\/","title":{"rendered":"CVE-2025-54895: Critical Integer Overflow Vulnerability in Windows SPNEGO Extended Negotiation<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The vulnerability in focus, CVE-2025-54895, is a critical security flaw affecting the Windows Security Provider Negotiator (SPNEGO) Extended Negotiation. The vulnerability arises due to an integer overflow or wraparound, which could be exploited by an authorized attacker to elevate privileges locally. This vulnerability, while requiring local access, could potentially lead to system<\/a> compromise or data leakage, highlighting the importance of rapid mitigation.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-54895
\nSeverity: High (7.8)
\nAttack Vector: Local
\nPrivileges Required: Low
\nUser Interaction: None
\nImpact: System compromise or data leakage due to local privilege escalation<\/a><\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Windows SPNEGO | All previous versions prior to patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit leverages an integer overflow or wraparound in the Windows<\/a> SPNEGO Extended Negotiation. This flaw allows an authorized local attacker to manipulate the overflow to corrupt memory, elevate their privileges, and execute arbitrary code<\/a>. This could lead to unauthorized system access, potential system compromise, or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual example of how the vulnerability might be exploited. This pseudocode demonstrates the manipulation of the integer overflow to elevate privileges.<\/p>\n

#include \nint main() {\n\/\/ Initialize SPNEGO negotiation\nSPNEGOHandle handle = SPNEGO_Init();\n\/\/ Create integer overflow\nint overflow = INT_MAX + 1;\n\/\/ Use overflow to corrupt memory and elevate privileges\nSPNEGO_Negotiate(handle, overflow);\n\/\/ Execute arbitrary code with elevated privileges\nsystem(\"malicious_command\");\nreturn 0;\n}<\/code><\/pre>\n
Mitigation Guidance<\/strong><\/p>\n
Users are advised to apply the latest vendor patches as soon as possible to remediate this vulnerability. If patches cannot be applied immediately, the use of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) may offer temporary mitigation. However, these are not long-term solutions as they do not address the underlying vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The vulnerability in focus, CVE-2025-54895, is a critical security flaw affecting the Windows Security Provider Negotiator (SPNEGO) Extended Negotiation. The vulnerability arises due to an integer overflow or wraparound, which could be exploited by an authorized attacker to elevate privileges locally. This vulnerability, while requiring local access, could potentially lead to system compromise or […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-85549","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft","attack_vector-privilege-escalation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t