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Vulnerability of libxml2: infinite loop of xmlParserEntityCheck

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, VNX Operating Environment, VNX Series, BIG-IP Hardware, TMOS, Junos OS, Junos Space, libxml, McAfee Web Gateway, openSUSE, openSUSE Leap, RHEL, Splunk Enterprise, SLES, Nessus, Ubuntu.
Severity of this announce: 2/4.
Creation date: 03/05/2016.
Références of this computer vulnerability: 765207, CERTFR-2017-AVI-012, CVE-2016-3705, DLA-503-1, DSA-2019-197, DSA-3593-1, JSA10770, JSA10916, JSA11023, openSUSE-SU-2016:1446-1, openSUSE-SU-2016:1594-1, openSUSE-SU-2016:1595-1, RHSA-2016:1292-01, SA129, SB10170, SOL54225343, SPL-119440, SPL-121159, SPL-123095, SUSE-SU-2016:1538-1, SUSE-SU-2016:1604-1, TNS-2017-03, USN-2994-1, VIGILANCE-VUL-19513.

Description of the vulnerability 

The libxml2 library includes an XML parser.

However, a malformed document triggers an infinite recursion in the xmlParserEntityCheck(), xmlParseEntityValue() and xmlParseAttValueComplex() functions, 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 security weakness impacts software or systems such as Blue Coat CAS, ProxyAV, ProxyRA, ProxySG par Blue Coat, SGOS by Blue Coat, Debian, VNX Operating Environment, VNX Series, BIG-IP Hardware, TMOS, Junos OS, Junos Space, libxml, McAfee Web Gateway, openSUSE, openSUSE Leap, RHEL, Splunk Enterprise, SLES, Nessus, Ubuntu.

Our Vigil@nce team determined that the severity of this threat bulletin is medium.

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 threat.

Solutions for this threat 

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

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

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

Dell EMC VNXe: version MR4 Service Pack 5.
The version MR4 Service Pack 5 is fixed:
  https://www.dell.com/support/

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

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 2-2.9.1-19.1

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

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

SUSE LE: new libxml2 packages.
New packages are available:
  SUSE LE 12 SP1: libxml2 2-2.9.1-24.1
  SUSE LE 11 SP4: libxml2 2.7.6-0.44.1
  SUSE LE 11 SP3: libxml2 2.7.6-0.44.1
  SUSE LE 11 SP2: libxml2 2.7.6-0.44.1

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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