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Vigil@nce - Debian: NULL pointer dereference via AUFS fcntl

September 2016 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

A local attacker can force a NULL pointer to be dereferenced on an
AUFS filesystem via fcntl() on Debian, in order to trigger a
denial of service.

 Impacted products: Debian.
 Severity: 1/4.
 Creation date: 31/08/2016.

DESCRIPTION OF THE VULNERABILITY

The Debian product has a specific kernel patch for the AUFS file
system.

However, when the F_SETFL option of fcntl(), which changes the
states of a descriptor, is called on a directory, it dereferences
a NULL pointer.

A local attacker can therefore force a NULL pointer to be
dereferenced on an AUFS filesystem via fcntl() on Debian, in order
to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Debian-NULL-pointer-dereference-via-AUFS-fcntl-20492


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