SB2022080925 - Multiple vulnerabilities in Microsoft Windows Hyper-V

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authorization (CVE-ID: CVE-2022-35751)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper authorization logic in vhdmp.sys driver when accessing VHD files. A local user can execute arbitrary code with SYSTEM privileges.

2) Race condition (CVE-ID: CVE-2022-34696)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to a race condition in the Windows Hyper-V. A remote user can exploit the race and gain unauthorized access to sensitive information and execute arbitrary code on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-35751
• https://www.zerodayinitiative.com/advisories/ZDI-22-1070/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-34696