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Vigil@nce - libtiff: unreachable memory reading via bmp2tiff

December 2014 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can force a read at an invalid address in bmp2tiff of
libtiff, in order to trigger a denial of service.

Impacted products: LibTIFF

Severity: 1/4

Creation date: 23/12/2014

DESCRIPTION OF THE VULNERABILITY

The bmp2tiff tool of the libtiff suite converts a BMP image to a
TIFF image.

However, the tif_packbits.c file tries to read a memory area which
is not reachable, which triggers a fatal error.

An attacker can therefore force a read at an invalid address in
bmp2tiff of libtiff, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/libtiff-unreachable-memory-reading-via-bmp2tiff-15873


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