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Vigil@nce: Linux kernel, integer overflow via InfiniBand

January 2011 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can use an InfiniBand Userspace Verb query, in
order to generate an integer overflow, leading to a memory
corruption.

 Severity: 1/4
 Creation date: 07/01/2011

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The InfiniBand technology is used for communication with external
devices.

The ib_uverbs module implements InfiniBand Userspace Verb. Users
can thus directly access to InfiniBand.

The ib_uverbs_poll_cq() function of the drivers/infiniband/core/uverbs_cmd.c
file processes Userspace Verb queries. However, if the number of
queries is too high, an integer overflow occurs.

A local attacker can therefore use an InfiniBand Userspace Verb
query, in order to generate an integer overflow, leading to a
memory corruption.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-integer-overflow-via-InfiniBand-10254


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