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Vigil@nce - FreeBSD: unreachable memory reading via vt

March 2015 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can force a read at an invalid address with a vt
of FreeBSD, in order to trigger a denial of service.

Impacted products: FreeBSD

Severity: 1/4

Creation date: 25/02/2015

DESCRIPTION OF THE VULNERABILITY

The support of virtual devices (vt) can be enabled on FreeBSD.

However, if a user requests a negative vt index, the
sys/dev/vt/vt_core.c file tries to read a memory area which is not
reachable, which triggers a fatal error.

A local attacker can therefore force a read at an invalid address
with a vt of FreeBSD, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/FreeBSD-unreachable-memory-reading-via-vt-16254


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