Custom Question Answering Elevation of Privilege Vulnerability

The elevation of privilege vulnerability in Azure Cognitive Service for Language allows an attacker to bypass access controls and perform actions they are not authorized to do. This could involve reading sensitive data, modifying existing data, or even creating new data with elevated permissions. A successful exploit could lead to significant data breaches, compromise the integrity of the service, and potentially impact downstream applications relying on the Cognitive Service. The potential blast radius extends to any application or user accessing data processed by the vulnerable service, making it a high-priority security concern. This type of privilege escalation is particularly dangerous in cloud environments where access controls are critical for maintaining data security and compliance.

Organizations heavily reliant on Azure Cognitive Service for Language for processing sensitive data, particularly those using older versions (1.0.0 and earlier), are at significant risk. Those with complex access control configurations or those who have not implemented robust RBAC policies are also more vulnerable.

• azure: Review Azure Activity Logs for suspicious API calls related to the Cognitive Service for Language, specifically focusing on attempts to bypass access controls. • azure: Use Azure Security Center to monitor for unusual user activity and privilege escalation attempts. • generic web: Monitor network traffic to and from the Cognitive Service endpoint for unexpected patterns or unauthorized requests. • generic web: Review application logs for errors or anomalies that might indicate an attempted exploit.

1. 2025-12-18Disclosure

   disclosure

1. Reserviert2025-11-06
2. Veröffentlicht2025-12-18
3. Geändert2026-04-16
4. EPSS aktualisiert2026-03-23

The primary mitigation for CVE-2025-64663 is to upgrade Azure Cognitive Service for Language to version 2.5.4 or later. If immediate upgrade is not feasible, consider implementing stricter access controls and monitoring for suspicious activity. Specifically, review and tighten IAM (Identity and Access Management) policies to limit the permissions granted to users and applications accessing the Cognitive Service. Implement network segmentation to isolate the service from other critical systems. While a direct WAF rule is unlikely, monitor API request patterns for unusual behavior indicative of privilege escalation attempts. After upgrading, verify the fix by attempting to access resources with a low-privilege account and confirming access is denied.