Vigil@nce - Docker Engine: privilege escalation via file descriptors
January 2017 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker, inside a guest system, can use file descriptor
inherited via the debug support of Docker Engine, in order to
escalate his privileges on the host system.
Impacted products: Docker Engine, Fedora, RHEL.
Severity: 1/4.
Creation date: 11/01/2017.
DESCRIPTION OF THE VULNERABILITY
The Docker Engine product offers cross container debugging support.
However, file descriptors inherited by new processes are not
filtered, so an attacker can access files opened by a process in
another container.
An attacker, inside a guest system, can therefore use file
descriptor inherited via the debug support of Docker Engine, in
order to escalate his privileges on the host system.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Docker-Engine-privilege-escalation-via-file-descriptors-21551