Vigil@nce - OpenBSD: denial of service via httpd
July 2015 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can preform a quick error query on httpd of OpenBSD,
in order to trigger a denial of service.
Impacted products: OpenBSD
Severity: 2/4
Creation date: 04/05/2015
DESCRIPTION OF THE VULNERABILITY
The OpenBSD product offers a web service.
This service logs events. However, the logging buffer is allocated
too late in the server_accept() function. If the httpd service
tries to log too soon, it then dereferences a NULL pointer.
An attacker can therefore preform a quick error query on httpd of
OpenBSD, in order to trigger a denial of service.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/OpenBSD-denial-of-service-via-httpd-16810