SB2017080815 - Two vulnerabilities in Windows Subsystem for Linux

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2017-8622)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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 elevate privileges on the system.

The vulnerability exists due to an error in the way that the Windows Subsystem for Linux handles NT pipes. A local user could exploit this vulnerability to execute code with elevated permissions.

Successful exploitation of the vulnerability may allow a local user to execute code with elevated privileges on the system.

2) Memory corruption (CVE-ID: CVE-2017-8627)

CWE-ID: CWE-119 - Memory corruption

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

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to boundary error within Windows Subsystem for Linux. A local user could exploit this vulnerability to perform a denial of service attack.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8622
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8627