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Vigil@nce - Linux kernel: denial of service via Ceph

July 2013 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A remote attacker can send an invalid Ceph auth_reply message to
the Linux kernel, in order to trigger a denial of service.

Impacted products: Fedora, Linux, MBS

Severity: 2/4

Creation date: 03/07/2013

DESCRIPTION OF THE VULNERABILITY

The Ceph technology stores objects/files on a distributed network.
The experimental Ceph module can be enabled during the compilation
of the Linux kernel, with the CONFIG_CEPH_LIB option.

The auth_reply message is used during the authentication procedure
to Ceph. However, if this message is incomplete, the kernel
dereferences a NULL function pointer ("build_request").

A remote attacker can therefore send an invalid Ceph auth_reply
message to the Linux kernel, in order to trigger a denial of
service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-Ceph-13044


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