SB2013070205 - Permissions, Privileges, and Access Controls in FreeBSD

Description

This security bulletin contains information about 1 vulnerability.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-2171)

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

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

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The vm_map_lookup function in sys/vm/vm_map.c in the mmap implementation in the kernel in FreeBSD 9.0 through 9.1-RELEASE-p4 does not properly determine whether a task should have write access to a memory location, which allows local users to bypass filesystem write permissions and consequently gain privileges via a crafted application that leverages read permissions, and makes mmap and ptrace system calls.

Remediation

Install update from vendor's website.

References

• http://svnweb.freebsd.org/base?view=revision&revision=251901
• http://www.debian.org/security/2013/dsa-2714
• http://www.freebsd.org/security/advisories/FreeBSD-SA-13:06.mmap.asc