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Vigil@nce - Apache httpd: denial of service via mod_deflate

August 2014 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can send special data to Apache httpd with mod_deflate
as an Input Filter, in order to trigger a denial of service.

Impacted products: Apache httpd, Debian, Fedora, MBS, RHEL,
Slackware, Ubuntu

Severity: 2/4

Creation date: 17/07/2014

DESCRIPTION OF THE VULNERABILITY

The mod_deflate module of Apache httpd compresses/uncompresses
data.

The decompression of the HTTP body is for example enabled with:

SetInputFilter DEFLATE

However, in this case, special data lead to the consumption of
several resources.

An attacker can therefore send special data to Apache httpd with
mod_deflate as an Input Filter, in order to trigger a denial of
service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Apache-httpd-denial-of-service-via-mod-deflate-15067


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