SB2019100923 - Multiple vulnerabilities in Microsoft Windows Update Client

Description

This security bulletin contains information about 3 vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-1323)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/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 Windows Update Client does not properly handle privileges. A local authenticated user can run a specially crafted application and run processes in an elevated context.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-1336)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/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 Windows Update Client does not properly handle privileges. A local authenticated user can run a specially crafted application and run processes in an elevated context.

3) Out-of-bounds read (CVE-ID: CVE-2019-1337)

CWE-ID: CWE-125 - Out-of-bounds read

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

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to Windows Update Client fails to properly handle objects in memory. A local authenticated user can use a specially crafted application to trigger out-of-bounds read error and read contents of an elevated process.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1323
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1336
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1337