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

medium Nessus Plugin ID 87686

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.

Solution

Update the affected packages.

See Also

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205813

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205814

https://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?696c2bf0

http://www.nessus.org/u?3ca6c124

http://www.nessus.org/u?8884fec2

Plugin Details

Severity: Medium

ID: 87686

File Name: freebsd_pkg_1384f2fdb1be11e59728002590263bf5.nasl

Version: 2.7

Type: local

Published: 1/4/2016

Updated: 1/4/2021

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:qemu, p-cpe:/a:freebsd:freebsd:qemu-devel, p-cpe:/a:freebsd:freebsd:qemu-sbruno, p-cpe:/a:freebsd:freebsd:qemu-user-static, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 1/3/2016

Vulnerability Publication Date: 12/28/2015

Reference Information

CVE: CVE-2015-8701