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Vulnerability of libxml2: out-of-bounds memory reading via htmlParseTryOrFinish

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via htmlParseTryOrFinish() of libxml2, in order to trigger a denial of service, or to obtain sensitive information.
Impacted systems: Debian, Fedora, libxml, openSUSE Leap, Slackware, Nessus.
Severity of this alert: 2/4.
Creation date: 11/05/2017.
Références of this alert: 775200, CERTFR-2018-AVI-288, CVE-2017-8872, DLA-2369-1, FEDORA-2018-a6b59d8f78, FEDORA-2018-db610fff5b, openSUSE-SU-2017:2190-1, SSA:2017-266-01, TNS-2018-08, VIGILANCE-VUL-22709.

Description of the vulnerability 

An attacker can force a read at an invalid address via htmlParseTryOrFinish() of libxml2, in order to trigger a denial of service, or to obtain sensitive information.
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This computer threat announce impacts software or systems such as Debian, Fedora, libxml, openSUSE Leap, Slackware, Nessus.

Our Vigil@nce team determined that the severity of this computer vulnerability 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 alert.

Solutions for this threat 

libxml2: version 2.9.5.
The version 2.9.5 is fixed:
  ftp://xmlsoft.org/libxml2/

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

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

Fedora: new libxml2 packages (31/01/2018).
New packages are available:
  Fedora 27: libxml2 2.9.7-1.fc27
  Fedora 26: libxml2 2.9.7-1.fc26

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

openSUSE Leap: new libxml2 packages.
New packages are available:
  openSUSE Leap 42.2: libxml2 2-2.9.4-5.17.1
  openSUSE Leap 42.3: libxml2 2-2.9.4-12.1

Slackware: new libxml2 packages.
New packages are available:
  Slackware 14.0: libxml2 2.9.5-*-1_slack14.0
  Slackware 14.1: libxml2 2.9.5-*-1_slack14.1
  Slackware 14.2: libxml2 2.9.5-*-1_slack14.2
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