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Vulnerability of Firejail: privilege escalation via OverlayFS

Synthesis of the vulnerability 

An attacker can bypass restrictions via OverlayFS of Firejail, in order to escalate his privileges.
Vulnerable products: Debian, openSUSE Leap.
Severity of this weakness: 2/4.
Creation date: 10/02/2021.
Références of this bulletin: CVE-2021-26910, DLA-2554-1, DSA-4849-1, openSUSE-SU-2021:0271-1, VIGILANCE-VUL-34542.

Description of the vulnerability 

An attacker can bypass restrictions via OverlayFS of Firejail, in order to escalate his privileges.
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This computer weakness bulletin impacts software or systems such as Debian, openSUSE Leap.

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

The trust level is of type confirmed by the editor, with an origin of user shell.

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

Solutions for this threat 

Debian 10: new firejail packages.
New packages are available:
  Debian 10: firejail 0.9.58.2-2+deb10u2

Debian 9: new firejail packages.
New packages are available:
  Debian 9: firejail 0.9.44.8-2+deb9u2

openSUSE Leap 15.2: new firejail packages (11/02/2021).
New packages are available:
  openSUSE Leap 15.2: firejail 0.9.64.4-lp152.3.6.1
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