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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/...




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