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Vulnerability of libxml2: denial of service via xz_head

Synthesis of the vulnerability 

An attacker can generate a fatal error via xz_head() of libxml2, in order to trigger a denial of service.
Impacted software: Debian, Junos OS, libxml, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Nessus, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 09/04/2018.
Références of this announce: bulletinapr2019, CERTFR-2018-AVI-288, CVE-2017-18258, DLA-1524-1, DLA-2369-1, JSA10916, openSUSE-SU-2018:3107-1, RHSA-2020:1190-01, SUSE-SU-2018:3081-1, TNS-2018-08, USN-3739-1, USN-3739-2, VIGILANCE-VUL-25798.

Description of the vulnerability 

An attacker can generate a fatal error via xz_head() of libxml2, in order to trigger a denial of service.
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This computer weakness impacts software or systems such as Debian, Junos OS, libxml, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Nessus, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability note is medium.

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

An attacker with a expert ability can exploit this cybersecurity threat.

Solutions for this threat 

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

Debian 8: new libxml2 packages.
New packages are available:
  Debian 8: libxml2 2.9.1+dfsg1-5+deb8u7

Debian 9: new libxml2 packages.
New packages are available:
  Debian 9: libxml2 2.9.4+dfsg1-2.2+deb9u3

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

Nessus: version 7.1.1.
The version 7.1.1 is fixed:
  https://www.tenable.com/downloads/nessus

openSUSE Leap 42.3: new libxml2 packages.
New packages are available:
  openSUSE Leap 42.3: libxml2 2-2.9.4-18.1

Oracle Solaris: patch for third party software of April 2019 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 7: new libxml2 packages.
New packages are available:
  RHEL 7.0-7.7: libxml2 2.9.1-6.el7.4

SUSE LE 12 SP3: new libxml2 packages.
New packages are available:
  SUSE LE 12 SP3: libxml2 2-2.9.4-46.15.1

Ubuntu: new libxml2 packages.
New packages are available:
  Ubuntu 18.04 LTS: libxml2 2.9.4+dfsg1-6.1ubuntu1.2
  Ubuntu 16.04 LTS: libxml2 2.9.3+dfsg1-1ubuntu0.6
  Ubuntu 14.04 LTS: libxml2 2.9.1+dfsg1-3ubuntu4.13
  Ubuntu 12.04 ESM: libxml2 2.7.8.dfsg-5.1ubuntu4.21
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