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Vulnerability of Rack: directory traversal via Rack-Directory

Synthesis of the vulnerability 

An attacker can traverse directories via Rack::Directory of Rack, in order to read a file outside the service root path.
Vulnerable products: Debian.
Severity of this weakness: 2/4.
Creation date: 25/05/2020.
Références of this bulletin: CVE-2020-8161, DLA-2216-1, DLA-2275-1, VIGILANCE-VUL-32328.

Description of the vulnerability 

An attacker can traverse directories via Rack::Directory of Rack, in order to read a file outside the service root path.
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This computer threat impacts software or systems such as Debian.

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

Solutions for this threat 

Debian 8: new ruby-rack packages.
New packages are available:
  Debian 8: ruby-rack 1.5.2-3+deb8u3

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