{"id":64160,"date":"2025-08-19T04:53:06","date_gmt":"2025-08-19T04:53:06","guid":{"rendered":""},"modified":"2025-09-10T12:13:45","modified_gmt":"2025-09-10T18:13:45","slug":"cve-2025-49694-null-pointer-dereference-vulnerability-in-microsoft-brokering-file-system","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-49694-null-pointer-dereference-vulnerability-in-microsoft-brokering-file-system\/","title":{"rendered":"CVE-2025-49694: Null Pointer Dereference Vulnerability in Microsoft Brokering File System<\/strong>"},"content":{"rendered":"

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

The CVE-2025-49694 is a critical security vulnerability in the Microsoft Brokering File System. This vulnerability allows an authorized attacker to exploit a null pointer dereference, leading to an elevation of privileges on a local level. As a cybersecurity issue, it poses a serious risk to all users, particularly those operating in enterprise environments where sensitive data might be accessible<\/a>. This vulnerability, if left unpatched, could lead to potential<\/a> system compromise or data leakage, which underscores the importance of immediate action and mitigation.<\/p>\n

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

CVE ID: CVE-2025-49694
\nSeverity: High (CVSS: 7.8)
\nAttack Vector: Local
\nPrivileges Required: Low
\nUser Interaction: Required
\nImpact: Elevation of privileges<\/a>, potential system compromise, or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Microsoft Brokering File<\/a> System | All current versions<\/p>\n

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

The exploit works by an authenticated attacker sending a specially crafted file to a vulnerable version of the Microsoft<\/a> Brokering File System. This file triggers a null pointer dereference that can be leveraged by the attacker to execute arbitrary code with elevated privileges<\/a> on the affected system, potentially leading to a full 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. Note that this is pseudocode and it’s only intended to demonstrate the exploit conceptually:<\/p>\n

#!\/usr\/bin\/env python\nimport requests\nimport json\n# Prepare the malicious payload\nmalicious_payload = {\n\"file\": {\n\"name\": \"exploit.txt\",\n\"content\": \"NULL_POINTER_DEREFERENCE_TRIGGER\"\n}\n}\n# Send the malicious payload to the vulnerable system\nresponse = requests.post(\n\"http:\/\/target.example.com\/vulnerable\/endpoint\",\nheaders={\"Content-Type\": \"application\/json\"},\ndata=json.dumps(malicious_payload)\n)\n# Check the response\nif response.status_code == 200:\nprint(\"Exploit successful!\")\nelse:\nprint(\"Exploit failed.\")<\/code><\/pre>\n
The above code demonstrates how an attacker might craft and send a malicious file<\/a> to the vulnerable endpoint. If the exploit is successful, the attacker would be able to execute arbitrary code<\/a> with elevated privileges on the target system.
\nIn order to mitigate this vulnerability<\/a>, it is advised to apply the vendor’s security patch as soon as possible or use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary measure.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The CVE-2025-49694 is a critical security vulnerability in the Microsoft Brokering File System. This vulnerability allows an authorized attacker to exploit a null pointer dereference, leading to an elevation of privileges on a local level. As a cybersecurity issue, it poses a serious risk to all users, particularly those operating in enterprise environments where […]<\/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":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64160","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft"],"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