FreeBSD : qemu -- denial of service vulnerability in Rocker switch emulation (1384f2fd-b1be-11e5-9728-002590263bf5)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing one or more security-related
updates.

Description :

Prasad J Pandit, Red Hat Product Security Team, reports :

Qemu emulator built with the Rocker switch emulation support is
vulnerable to an off-by-one error. It happens while processing
transmit(tx) descriptors in 'tx_consume' routine, if a descriptor was
to have more than allowed (ROCKER_TX_FRAGS_MAX=16) fragments.

A privileged user inside guest could use this flaw to cause memory
leakage on the host or crash the Qemu process instance resulting in
DoS issue.

See also :

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205813
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205814
http://www.openwall.com/lists/oss-security/2015/12/28/6
https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg04629.html
http://www.nessus.org/u?75884ff2
http://www.nessus.org/u?3ca6c124
http://www.nessus.org/u?9b4fe30a

Solution :

Update the affected packages.

Risk factor :

Low / CVSS Base Score : 2.1
(CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 87686 ()

Bugtraq ID:

CVE ID: CVE-2015-8701

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