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Vulnerability of Rack: privilege escalation via Cookie Prefix

Synthesis of the vulnerability 

An attacker can bypass restrictions via Cookie Prefix of Rack, in order to escalate his privileges.
Vulnerable products: Debian, SLES, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 14/07/2020.
Références of this bulletin: CVE-2020-8184, DLA-2275-1, SUSE-SU-2020:3036-1, USN-4561-1, VIGILANCE-VUL-32796.

Description of the vulnerability 

An attacker can bypass restrictions via Cookie Prefix of Rack, in order to escalate his privileges.
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This weakness impacts software or systems such as Debian, SLES, 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 internet client.

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

Solutions for this threat 

Debian 9: new ruby-rack packages.
New packages are available:
  Debian 9: ruby-rack 1.6.4-4+deb9u2

SUSE LE 15 SP2: new rmt-server packages.
New packages are available:
  SUSE LE 15 SP2: rmt-server 2.6.5-3.3.1

Ubuntu 18.04: new ruby-rack packages.
New packages are available:
  Ubuntu 18.04 LTS: ruby-rack 1.6.4-4ubuntu0.2

Wind River Linux: version 10.19.45.13.
The version 10.19.45.13 is fixed:
  https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=24&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list
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