SB2017061317 - Windows Kernel Information Disclosure Vulnerability

Description

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2017-8491)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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:P/U:Clear

The vulnerability allows a local authenticated attacker to obtain potentially sensitive information on the target system.

The weakness exists due to improper initialization of objects in memory by the Windows kernel. A local attacker can run a specially crafted application and obtain information to perform further attacks.

Successful exploitation of the vulnerability results in information disclosure.

2) Information disclosure (CVE-ID: CVE-2017-8472)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

An information disclosure vulnerability exists when the Windows kernel improperly initializes objects in memory within win32k.sys system driver. A local user can obtain portions of potentially sensitive information from system memory.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8491
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8472