Guanghui Xia

**Name of the Vulnerable Software and Affected Versions** Microsoft Streaming Service Proxy versions prior to the fixed version **Description** The issue is related to an elevation-of-privilege vulnerability in the Microsoft Streaming Service Proxy, which allows attackers to gain system-level rights. This vulnerability is associated with a buffer overflow in memory. The estimated number of potentially affected devices is not specified. There have been reports of real-world incidents where this issue was exploited, including limited exploitation in the wild. Technical details about exploitation include the involvement of the MSKSSRV.SYS driver. **Recommendations** For versions prior to the fixed version, apply the patch issued on September 12, 2023, to resolve the issue. As a temporary workaround, consider restricting access to the MSKSSRV.SYS driver until a patch is applied. Avoid using the vulnerable Microsoft Streaming Service Proxy until the issue is resolved.