{"id":80288,"date":"2025-10-02T06:35:30","date_gmt":"2025-10-02T06:35:30","guid":{"rendered":""},"modified":"2025-10-28T17:39:13","modified_gmt":"2025-10-28T23:39:13","slug":"cve-2025-53154-privilege-escalation-via-null-pointer-dereference-in-windows-ancillary-function-driver","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53154-privilege-escalation-via-null-pointer-dereference-in-windows-ancillary-function-driver\/","title":{"rendered":"CVE-2025-53154: Privilege Escalation via Null Pointer Dereference in Windows Ancillary Function Driver<\/strong>"},"content":{"rendered":"

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

The cybersecurity community has recently identified a significant vulnerability in the Windows Ancillary Function Driver for WinSock, a critical component of the Windows operating system. This vulnerability, designated as CVE-2025-53154, is a null pointer dereference issue that potentially allows an authorized attacker to escalate their privileges, thereby gaining control over system resources or leaking sensitive data. This vulnerability is particularly concerning given the widespread use of Windows<\/a> systems in personal, professional, and enterprise environments. In this post, we will delve into the details of this vulnerability, including its impact, how it works, and how to mitigate it.<\/p>\n

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

CVE ID: CVE-2025-53154
\nSeverity: High, CVSS score 7.8
\nAttack Vector: Local
\nPrivileges Required: Low
\nUser Interaction: None
\nImpact: Potential system compromise<\/a> or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Windows Ancillary Function Driver<\/a> | All versions prior to the patch<\/p>\n

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

This exploit takes advantage of a null pointer dereference<\/a> in the Windows Ancillary Function Driver for WinSock. An attacker with authorized access to the system can trigger this vulnerability<\/a> by sending a specially crafted sequence of packets to the driver. This sequence, if executed correctly, can cause the driver to dereference a null pointer, leading to a system<\/a> crash or other undefined behavior. In some cases, the attacker can leverage this undefined behavior to escalate their privileges<\/a> on the system and perform unauthorized actions.<\/p>\n

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

While the specific details of the exploit are complex and beyond the scope of this post, the following pseudocode provides a conceptual understanding of how an attacker might trigger the null pointer dereference:<\/p>\n

\/\/ initiate connection to the driver\ndriver = connect_to_driver('Windows Ancillary Function Driver')\n\/\/ craft the malicious packet sequence\npacket_sequence = craft_malicious_packet_sequence()\n\/\/ send the packet sequence to the driver\nsend_to_driver(driver, packet_sequence)\n\/\/ if the driver crashes, try to escalate privileges\nif driver.has_crashed():\nescalate_privileges()<\/code><\/pre>\n
This code is a simplification and does not represent an actual exploit. It is intended only to illustrate the general process an attacker might follow to exploit this vulnerability.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
Microsoft has released a patch to address this vulnerability<\/a>, and all users are strongly urged to apply this patch as soon as possible. If immediate patching is not feasible, users can mitigate the risk by implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block exploit attempts. However, these measures should be considered temporary, as they may not fully protect against all potential exploit techniques.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity community has recently identified a significant vulnerability in the Windows Ancillary Function Driver for WinSock, a critical component of the Windows operating system. This vulnerability, designated as CVE-2025-53154, is a null pointer dereference issue that potentially allows an authorized attacker to escalate their privileges, thereby gaining control over system resources or leaking […]<\/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-80288","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