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Vulnerability of libxml2: infinite loop of xmlStringGetNodeList

Synthesis of the vulnerability 

An attacker can generate an infinite recursion in xmlStringGetNodeList() of libxml2, in order to trigger a denial of service.
Vulnerable software: Blue Coat CAS, ProxyAV, ProxyRA, ProxySG par Blue Coat, SGOS by Blue Coat, Debian, BIG-IP Hardware, TMOS, Junos OS, Junos Space, libxml, McAfee Web Gateway, openSUSE, openSUSE Leap, Solaris, RHEL, Splunk Enterprise, Nessus, Ubuntu.
Severity of this announce: 1/4.
Creation date: 21/03/2016.
Revision date: 03/05/2016.
Références of this computer vulnerability: 1989337, 1991909, 1991910, 1991911, 1991913, 1991997, 762100, bulletinjul2016, CERTFR-2017-AVI-012, CVE-2016-3627, DLA-503-1, DSA-3593-1, JSA10770, JSA10916, JSA11023, openSUSE-SU-2016:1298-1, openSUSE-SU-2016:1446-1, openSUSE-SU-2016:1594-1, RHSA-2016:1292-01, SA129, SB10170, SOL54225343, SPL-119440, SPL-121159, SPL-123095, TNS-2017-03, USN-2994-1, VIGILANCE-VUL-19201.

Description of the vulnerability 

The xmllint tool of libxml2 has the option "--recover" to try to decode a malformed XML document.

However, a malformed document triggers an infinite recursion in the xmlStringGetNodeList() function, which depletes the stack.

An attacker can therefore generate an infinite recursion in xmlStringGetNodeList() of libxml2, in order to trigger a denial of service.
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This vulnerability note impacts software or systems such as Blue Coat CAS, ProxyAV, ProxyRA, ProxySG par Blue Coat, SGOS by Blue Coat, Debian, BIG-IP Hardware, TMOS, Junos OS, Junos Space, libxml, McAfee Web Gateway, openSUSE, openSUSE Leap, Solaris, RHEL, Splunk Enterprise, Nessus, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity vulnerability is low.

The trust level is of type confirmed by the editor, with an origin of document.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this computer threat note.

Solutions for this threat 

libxml2: version 2.9.4.
The version 2.9.4 is fixed:
  http://xmlsoft.org/downloads.html

libxml2: patch for xmlStringGetNodeList.
A patch is indicated in information sources.

libxml2: workaround for xmlStringGetNodeList.
A workaround is to not use the "--recover" option.

Blue Coat: solution for libxml2.
The solution is indicated in information sources.

Debian 7: new libxml2 packages.
New packages are available:
  Debian 7: libxml2 2.8.0+dfsg1-7+wheezy6

Debian: new libxml2 packages.
New packages are available:
  Debian 8: libxml2 2.9.1+dfsg1-5+deb8u2

F5 BIG-IP: solution for libxml2.
The solution is indicated in information sources.

IBM BigFix Compliance Analytics: version 1.9.
The version 1.9 is fixed.

Junos OS: fixed versions for libxml2.
Fixed versions are indicated in information sources.

Junos Space: version 16.1R1.
The version 16.1R1 is fixed:
  https://www.juniper.net/

Junos Space: version 20.1R1.
The version 20.1R1 is fixed:
  https://www.juniper.net/support/downloads/

McAfee Web Gateway: versions 7.5.2.11 and 7.6.2.4.
Versions 7.5.2.11 and 7.6.2.4 are fixed:
  https://contentsecurity.mcafee.com/software_mwg7_download

openSUSE 13.2: new libxml2 packages (16/06/2016).
New packages are available:
  openSUSE 13.2: libxml2 2-2.9.4-7.17.1

openSUSE 13.2: new libxml2 packages (31/05/2016).
New packages are available:
  openSUSE 13.2: libxml2 2-2.9.3-7.11.1

openSUSE Leap 42.1: new libxml2 packages.
New packages are available:
  openSUSE Leap 42.1: libxml2 2-2.9.1-16.1

RHEL: new libxml2 packages.
New packages are available:
  RHEL 6: libxml2 2.7.6-21.el6_8.1
  RHEL 7: libxml2 2.9.1-6.el7_2.3

Solaris: patch for third party software of July 2016 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

Splunk Enterprise: versions 6.4.2, 6.3.6, 6.2.11, 6.1.11, 6.0.12 and 5.0.16.
Versions 6.4.2, 6.3.6, 6.2.11, 6.1.11, 6.0.12 and 5.0.16 are fixed:
  http://www.splunk.com/en_us/download.html

Tenable Nessus: version 6.10.
The version 6.10 is fixed.

Ubuntu: new libxml2 packages (07/06/2016).
New packages are available:
  Ubuntu 16.04 LTS: libxml2 2.9.3+dfsg1-1ubuntu0.1
  Ubuntu 15.10: libxml2 2.9.2+zdfsg1-4ubuntu0.4
  Ubuntu 14.04 LTS: libxml2 2.9.1+dfsg1-3ubuntu4.8
  Ubuntu 12.04 LTS: libxml2 2.7.8.dfsg-5.1ubuntu4.15
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