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Vulnerability of Ruby OpenID: privilege escalation via Discovery URL Change

Synthesis of the vulnerability 

An attacker can bypass restrictions via Discovery URL Change of Ruby OpenID, in order to escalate his privileges.
Impacted software: Debian.
Severity of this computer vulnerability: 2/4.
Creation date: 11/10/2019.
Références of this announce: CVE-2019-11027, DLA-1956-1, VIGILANCE-VUL-30598.

Description of the vulnerability 

An attacker can bypass restrictions via Discovery URL Change of Ruby OpenID, in order to escalate his privileges.
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This security alert impacts software or systems such as Debian.

Our Vigil@nce team determined that the severity of this security weakness is medium.

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

An attacker with a expert ability can exploit this security announce.

Solutions for this threat 

Debian 8: new ruby-openid packages.
New packages are available:
  Debian 8: ruby-openid 2.5.0debian-1+deb8u1
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