{"id":64109,"date":"2025-08-17T01:36:03","date_gmt":"2025-08-17T01:36:03","guid":{"rendered":""},"modified":"2025-09-10T11:55:39","modified_gmt":"2025-09-10T17:55:39","slug":"cve-2025-47973-buffer-over-read-in-virtual-hard-disk-vhdx-leading-to-privilege-elevation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-47973-buffer-over-read-in-virtual-hard-disk-vhdx-leading-to-privilege-elevation\/","title":{"rendered":"CVE-2025-47973: Buffer Over-Read in Virtual Hard Disk (VHDX) Leading to Privilege Elevation<\/strong>"},"content":{"rendered":"

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

CVE-2025-47973 is a significant cybersecurity vulnerability involving a buffer over-read situation in Virtual Hard Disk (VHDX) systems. This vulnerability could potentially allow an attacker to gain unauthorized access and elevate privileges locally. The issue is particularly concerning for organizations utilizing virtualized environments, as it could lead to system<\/a> compromise or data leakage.
\nUnderstanding and addressing this vulnerability promptly is crucial due to its severity<\/a>. A successful exploit could lead to severe consequences, including unauthorized system access<\/a>, sensitive data exposure, and potential system compromise. Such breaches could also lead to reputational damage and financial losses for affected organizations.<\/p>\n

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

CVE ID: CVE-2025-47973
\nSeverity: High (7.8 CVSS Score)
\nAttack Vector: Local
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System compromise and potential<\/a> data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Microsoft Windows Server<\/a> | 2012, 2016, 2019
\nMicrosoft Hyper-V | All versions prior<\/a> to October 2025<\/p>\n

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

The vulnerability involves a buffer<\/a> over-read situation within the handling of VHDX files. An attacker could craft a malicious VHDX image and then mount it to exploit the vulnerability<\/a>. This could lead to an out-of-bounds read, which might allow the attacker to obtain sensitive information from the host system or to execute arbitrary code with elevated privileges<\/a>.<\/p>\n

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

Here is a conceptual example of an exploit, assuming the attacker has local access<\/a> to the system:<\/p>\n

# Create a malicious VHDX image\nvhdxtool create -size 10G -type dynamic -block 32K -log 1M malicious.vhdx\n# Mount the VHDX image\nmount -t vhdx -o loop malicious.vhdx \/mnt\/vhdx\n# Interact with the system using the elevated privileges\nwhoami<\/code><\/pre>\n
Please note that the above is a conceptual example and will not work as is. It aims to illustrate the nature of the exploit.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
To mitigate this vulnerability, organizations should apply the latest patches provided by the vendor. If a patch is not immediately available, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure. Regularly updating these systems and monitoring for any unusual activity can significantly decrease the risk of a successful exploit.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-47973 is a significant cybersecurity vulnerability involving a buffer over-read situation in Virtual Hard Disk (VHDX) systems. This vulnerability could potentially allow an attacker to gain unauthorized access and elevate privileges locally. The issue is particularly concerning for organizations utilizing virtualized environments, as it could lead to system compromise or data leakage. Understanding and […]<\/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-64109","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