SB2017091232 - Two vulnerabilities in Microsoft Windows

Description

This security bulletin contains information about 2 vulnerabilities.

1) Privilege escalation (CVE-ID: CVE-2017-8702)

CWE-ID: CWE-20 - Improper input validation

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

An elevation of privilege vulnerability exists in Windows Error Reporting (WER) when WER handles and executes files. A local user can execute arbitrary code on the target system with elevated privileges.

2) Security restrictions bypass (CVE-ID: CVE-2017-8716)

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

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

The vulnerability allows a local attacker to bypass security restrictions on the target system.

The vulnerability exists due to mishandling of objects in memory by Windows Control Flow Guard. A local attacker can run a specially crafted application and bypass security restrictions.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8702
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8716