SB2017080805 - Two vulnerabilities in Win32k.sys driver in Microsoft Windows

Description

This security bulletin contains information about 2 vulnerabilities.

1) Memory corruption (CVE-ID: CVE-2017-8593)

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 execute arbitrary code on the target system.

The vulnerability exists due to boundary error in Win32k.sys driver. A local user can execute arbitrary code on vulnerable system with elevated privileges.

2) Memory corruption (CVE-ID: CVE-2017-8666)

CWE-ID: CWE-119 - Memory corruption

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

The vulnerability allows a local user to obtain potentially sensitive information.

The vulnerability exists due to a boundary error when handling objects in memory in Win32k.sys driver. A local user can gain access to potentially sensitive information.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8593
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8666