Debian DLA-654-1 : libxfixes security update

critical Nessus Plugin ID 94075


The remote Debian host is missing a security update.


It was discovered that there was a integer overflow in libxfixes, a library providing a client interface to the X11 'XFIXES' extension.

The 32 bit field 'rep.length' was not checked for validity, which allowed an integer overflow on 32 bit systems. A malicious server could send INT_MAX as 'length' which was then multiplied by the size of XRectangle. In this case the client would not read the whole data from server, getting out of sync.

For Debian 7 'Wheezy', this issue has been fixed in libxfixes version 1:5.0-4+deb7u2.

We recommend that you upgrade your libxfixes packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade the affected packages.

See Also

Plugin Details

Severity: Critical

ID: 94075

File Name: debian_DLA-654.nasl

Version: 2.7

Type: local

Agent: unix

Published: 10/17/2016

Updated: 1/11/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libxfixes-dev, p-cpe:/a:debian:debian_linux:libxfixes3, p-cpe:/a:debian:debian_linux:libxfixes3-dbg, p-cpe:/a:debian:debian_linux:libxfixes3-udeb, cpe:/o:debian:debian_linux:7.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 10/14/2016

Reference Information

CVE: CVE-2016-7944