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Vigil@nce - OpenBSD on hppa plateforms: integer overflow in the sti graphic driver
June 2017 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can generate an integer overflow in the sti driver of
OpenBSD, in order to trigger a denial of service.
– Impacted products: OpenBSD.
– Severity: 1/4.
– Creation date: 13/06/2017.
DESCRIPTION OF THE VULNERABILITY
OpenBSD includes a video card driver sti.
However, in the function sti_ioctl(), a caller controlled variable
is used in a comparison is such a way that the user can bypass a
check and then trigger a kernel crash.
An attacker can therefore generate an integer overflow in the sti
driver of OpenBSD, in order to trigger a denial of service.
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