SB2016082604 - Privilege escalation in Linux Kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Privilege escalation (CVE-ID: CVE-2016-7097)

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

CVSSv4: 8.5 [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]

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to the setgid bit being preserved during a setxattr call by the filesystem implementation. A local attacker can leverage the existence of a setgid program to gain group privileges.

Successful exploitation of the vulnerability results in privileges escalation.

Remediation

Install update from vendor's website.

References

• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.37