Debian DLA-691-1 : libxml2 security update

Critical Nessus Plugin ID 94448

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VPR Score: 6.7

Synopsis

The remote Debian host is missing a security update.

Description

CVE-2016-4658 Namespace nodes must be copied to avoid use-after-free errors. But they don't necessarily have a physical representation in a document, so simply disallow them in XPointer ranges.

CVE-2016-5131 The old code would invoke the broken xmlXPtrRangeToFunction. range-to isn't really a function but a special kind of location step. Remove this function and always handle range-to in the XPath code. The old xmlXPtrRangeToFunction could also be abused to trigger a use-after-free error with the potential for remote code execution.

For Debian 7 'Wheezy', these problems have been fixed in version 2.8.0+dfsg1-7+wheezy7.

We recommend that you upgrade your libxml2 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.

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2016/10/msg00048.html

https://packages.debian.org/source/wheezy/libxml2

Plugin Details

Severity: Critical

ID: 94448

File Name: debian_DLA-691.nasl

Version: 2.4

Type: local

Agent: unix

Published: 2016/11/01

Updated: 2020/03/12

Dependencies: 12634

Risk Information

Risk Factor: Critical

VPR Score: 6.7

CVSS v2.0

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

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: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libxml2, p-cpe:/a:debian:debian_linux:libxml2-dbg, p-cpe:/a:debian:debian_linux:libxml2-dev, p-cpe:/a:debian:debian_linux:libxml2-doc, p-cpe:/a:debian:debian_linux:libxml2-utils, p-cpe:/a:debian:debian_linux:libxml2-utils-dbg, p-cpe:/a:debian:debian_linux:python-libxml2, p-cpe:/a:debian:debian_linux:python-libxml2-dbg, cpe:/o:debian:debian_linux:7.0

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/10/31

Reference Information

CVE: CVE-2016-4658, CVE-2016-5131