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Vulnerability of Apache Shiro: privilege escalation via Dynamic Controllers

Synthesis of the vulnerability 

An attacker can bypass restrictions via Dynamic Controllers of Apache Shiro, in order to escalate his privileges.
Impacted software: Debian, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 08/07/2020.
Références of this announce: CVE-2020-11989, DLA-2273-1, USN-4740-1, VIGILANCE-VUL-32752.

Description of the vulnerability 

An attacker can bypass restrictions via Dynamic Controllers of Apache Shiro, in order to escalate his privileges.
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This weakness impacts software or systems such as Debian, Ubuntu.

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

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 threat bulletin.

Solutions for this threat 

Debian 9: new shiro packages.
New packages are available:
  Debian 9: shiro 1.3.2-1+deb9u1

Ubuntu: new libshiro-java packages.
New packages are available:
  Ubuntu 20.04 LTS: libshiro-java 1.3.2-4ubuntu0.1
  Ubuntu 18.04 LTS: libshiro-java 1.3.2-3~18.04.1
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