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Vigil@nce - Apache httpd: buffer overflow of mod_status
August 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can generate a buffer overflow in mod_status of Apache
httpd, in order to trigger a denial of service, and possibly to
execute code.
Impacted products: Apache httpd, Debian, Fedora, MBS, RHEL,
Slackware, Ubuntu
Severity: 2/4
Creation date: 17/07/2014
DESCRIPTION OF THE VULNERABILITY
The mod_status module can be enabled on Apache httpd:
SetHandler server-status
Require host example.com
Its access is usually restricted.
The ScoreBoard of httpd stores information related to current
processes and sessions. The mod_status module reads the
ScoreBoard. However, data are not correctly synchronized: when two
queries are sent on /server-status and a normal page, the size of
data (client, request, vhost) can be inconsistent.
An attacker can therefore generate a buffer overflow in mod_status
of Apache httpd, in order to trigger a denial of service, and
possibly to execute code.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Apache-httpd-buffer-overflow-of-mod-status-15066
