FreeBSD : xen-kernel -- use after free in FIFO event channel code (4bf57137-ba4d-11e6-ae1b-002590263bf5)

This script is Copyright (C) 2016 Tenable Network Security, Inc.

Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

The Xen Project reports :

When the EVTCHNOP_init_control operation is called with a bad guest
frame number, it takes an error path which frees a control structure
without also clearing the corresponding pointer. Certain subsequent
operations (EVTCHNOP_expand_array or another EVTCHNOP_init_control),
upon finding the non-NULL pointer, continue operation assuming it
points to allocated memory.

A malicious guest administrator can crash the host, leading to a DoS.
Arbitrary code execution (and therefore privilege escalation), and
information leaks, cannot be excluded.

See also :

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 7.2

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 95503 ()

Bugtraq ID:

CVE ID: CVE-2016-7154

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