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Vigil@nce - FreeBSD: denial of service via mmap
January 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can enlarge the size of the stack of a FreeBSD
application, in order to stop the kernel.
Impacted products: FreeBSD
Severity: 1/4
Creation date: 16/01/2014
DESCRIPTION OF THE VULNERABILITY
An application can enlarge the size of its stack by calling mmap()
with the MAP_STACK flag.
However, the kernel then tries to coalesce adjacent memory
regions, which triggers an assertion error in the vm_map_stack()
function.
A local attacker can therefore enlarge the size of the stack of a
FreeBSD application, in order to stop the kernel.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/FreeBSD-denial-of-service-via-mmap-14100
