SB2022081548 - Multiple vulnerabilities in Microsoft Windows Defender Credential Guard

Description

This security bulletin contains information about 2 vulnerabilities.

1) Security features bypass (CVE-ID: CVE-2022-35822)

CWE-ID: CWE-254 - Security Features

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

The vulnerability allows a local user to bypass implemented security restrictions.

the vulnerability exists due to unspecified error in Windows Defender Credential Guard. A local user can bypass Kerberos protection.

2) Buffer overflow (CVE-ID: CVE-2022-34711)

CWE-ID: CWE-119 - Memory corruption

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 a boundary error in Windows Defender Credential Guard. A local user can trigger memory corruption and execute arbitrary code with SYSTEM privileges.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-35822
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-34711