Resource exhaustion in OpenBSD - CVE-2016-6239

Vulnerability identifier: #VU161

CSH Severity: Medium

CVSS v4.0: 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:U/U:Green

CVE-ID: CVE-2016-6239

CWE-ID: CWE-400

Exploitation vector: Local access

Exploit availability: No public exploit available

Vendor: OpenBSD

Affected software:
OpenBSD

The vulnerability allows a local user to cause denial of service conditions on the target system.

The vulnerability exists due to resource error in OpenBSD. A local user can cause excessive resource consumption and a system crash by invoking the __MAP_NOFAULT mmap extension to trigger a flaw in sys_mmap().

Successful exploitation of this vulnerability may result in denial of service.

The vendor has issued a patch, available at:

http://ftp.openbsd.org/pub/OpenBSD/patches/5.8/common/020_mmap.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/5.9/common/016_mmap.patch.sig

• http://www.openbsd.org/errata59.html