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Vigil@nce - Linux kernel: information disclosure via genlock_dev_ioctl

November 2013 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can use GENLOCK_IOC_EXPORT on the Linux kernel,
to read a kernel memory fragment, in order to obtain sensitive
information.

Impacted products: Linux

Severity: 1/4

Creation date: 25/11/2013

DESCRIPTION OF THE VULNERABILITY

The genlock API provides locking features.

The GENLOCK_IOC_EXPORT ioctl is used to export a lock. The
genlock_dev_ioctl() function implements this ioctl. However, it
does not reset a kernel memory area before returning it to the
user.

A local attacker can therefore use GENLOCK_IOC_EXPORT on the Linux
kernel, to read a kernel memory fragment, in order to obtain
sensitive information.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-information-disclosure-via-genlock-dev-ioctl-13825


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