Actu
Vigil@nce - OpenBSD: denial of service via unaligned memory access
October 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can used an OpenBSD program using unaligned
addresses, in order to trigger a denial of service.
Impacted products: OpenBSD
Severity: 1/4
Creation date: 20/10/2014
DESCRIPTION OF THE VULNERABILITY
The exec system call of OpenBSD is used to start running a new
program.
The executable file includes an header that states the addresses
and sizes of the code area and the data one. The processor
requires that addresses are aligned. However, a attacker can
create a file header with unaligned addresses in order to trigger
an alignment exception in the kernel, which leads to a kernel
panic.
A local attacker can therefore used an OpenBSD program using
unaligned addresses, in order to trigger a denial of service.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/OpenBSD-denial-of-service-via-unaligned-memory-access-15505
