FreeBSD : xen-tools -- cirrus_bitblt_cputovideo does not check if memory region is safe (8cbd9c08-f8b9-11e6-ae1b-002590263bf5)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

The Xen Project reports :

In CIRRUS_BLTMODE_MEMSYSSRC mode the bitblit copy routine
cirrus_bitblt_cputovideo fails to check whether the specified memory
region is safe. A malicious guest administrator can cause an out of
bounds memory write, very likely exploitable as a privilege
escalation.

See also :

http://xenbits.xen.org/xsa/advisory-209.html
http://www.nessus.org/u?85fe80fe

Solution :

Update the affected package.

Risk factor :

High

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 97312 ()

Bugtraq ID:

CVE ID: CVE-2017-2620

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