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Vigil@nce: Apache httpd, denial of service of mod_proxy

June 2008 by Emmanuelle Lamandé

A malicious web server can return several interim responses in
order to consume the memory of the mod_proxy module.

 Gravity: 2/4
 Consequences: denial of service of service
 Provenance: internet server
 Means of attack: no proof of concept, no attack
 Ability of attacker: expert (4/4)
 Confidence: confirmed by the editor (5/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 11/06/2008
 Identifier: VIGILANCE-VUL-7889

IMPACTED PRODUCTS

Apache httpd [confidential versions]

DESCRIPTION

The mod_proxy module permits to use Apache httpd as a proxy server.

The ap_proxy_http_process_response() function handles answers
provided by web servers. However, if a server returns several
intermediary answers (code 100) the proxy stores them with no
limit, which progressively saturates its memory.

A malicious web server can therefore return several interim
responses in order to progressively consume the memory of the
mod_proxy module.

CHARACTERISTICS

 Identifiers: CVE-2008-2364, VIGILANCE-VUL-7889
 Url: https://vigilance.aql.fr/tree/1/7889


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