SB2023021510 - Privilege escalation in Microsoft Windows Graphics Component

Description

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2023-21804)

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 within the XPS document writer feature in Windows Graphics Component. A local user can trigger memory corruption and execute arbitrary code with SYSTEM privileges.

2) Use-after-free (CVE-ID: CVE-2023-21822)

CWE-ID: CWE-416 - Use After Free

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 win32kfull driver in Windows Graphics Component. A local user can trigger a use-after-free error and execute arbitrary code with SYSTEM privileges.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21804
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21822
• https://www.zerodayinitiative.com/advisories/ZDI-23-163/