SB2013042404 - Permissions, Privileges, and Access Controls in Linux kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-1958)

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

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote non-authenticated attacker to manipulate data.

The scm_check_creds function in net/core/scm.c in the Linux kernel before 3.8.6 does not properly enforce capability requirements for controlling the PID value associated with a UNIX domain socket, which allows local users to bypass intended access restrictions by leveraging the time interval during which a user namespace has been created but a PID namespace has not been created.

Remediation

Install update from vendor's website.

References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=92f28d973cce45ef5823209aab3138eb45d8b349
• http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6
• http://www.openwall.com/lists/oss-security/2013/04/16/11
• https://github.com/torvalds/linux/commit/92f28d973cce45ef5823209aab3138eb45d8b349