Vigil@nce - FreeBSD: memory corruption via bsdiff
September 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can generate a memory corruption via bsdiff of
FreeBSD, in order to trigger a denial of service, and possibly to
run code.
Impacted products: FreeBSD, openSUSE, openSUSE Leap.
Severity: 2/4.
Creation date: 25/07/2016.
DESCRIPTION OF THE VULNERABILITY
The FreeBSD product offers a bspatch tool using bsdiff to generate
a file from a difference file.
However, if the difference file contains a number too large, data
are written in the heap memory of the process.
An attacker can therefore generate a memory corruption via bsdiff
of FreeBSD, in order to trigger a denial of service, and possibly
to run code.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/FreeBSD-memory-corruption-via-bsdiff-20211