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Vulnerability of Apache Tomcat: privilege escalation via FORM authentication session fixation

Synthesis of the vulnerability

An attacker can bypass restrictions via FORM authentication session fixation of Apache Tomcat, in order to escalate his privileges.
Severity of this weakness: 1/4.
Creation date: 19/12/2019.
Références of this bulletin: CERTFR-2019-AVI-643, CVE-2019-17563, DSA-4596-1, openSUSE-SU-2020:0038-1, SUSE-SU-2020:0029-1, VIGILANCE-VUL-31188.

Description of the vulnerability

An attacker can bypass restrictions via FORM authentication session fixation of Apache Tomcat, in order to escalate his privileges.
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This security bulletin impacts software or systems such as Tomcat, Debian, openSUSE Leap, SLES.

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

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

An attacker with a expert ability can exploit this vulnerability alert.

Solutions for this threat

Apache Tomcat: version 9.0.30.
The version 9.0.30 is fixed:
  https://tomcat.apache.org/whichversion.html

Apache Tomcat: version 8.5.50.
The version 8.5.50 is fixed:
  https://tomcat.apache.org/whichversion.html

Apache Tomcat: version 7.0.99.
The version 7.0.99 is fixed:
  https://tomcat.apache.org/whichversion.html

Debian 9: new tomcat8 packages.
New packages are available:
  Debian 9: tomcat8 8.5.50-0+deb9u1, tomcat-native 1.2.21-1~deb9u1

openSUSE Leap 15.1: new tomcat packages.
New packages are available:
  openSUSE Leap 15.1: tomcat 9.0.30-lp151.3.6.1

SUSE LE 15 SP1: new tomcat packages.
New packages are available:
  SUSE LE 15 SP1: tomcat 9.0.30-4.10.1
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