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vulnerability alert 9411
ModSecurity: denials of service

Synthesis of the vulnerability
An attacker can generate several denials of service in the ModSecurity module for Apache httpd.
Severity: 2/4.
Consequences: denial of service of service.
Provenance: internet client.
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).
Number of vulnerabilities in this bulletin: 4.
Creation date: 08/02/2010.

Impacted products

Description of the vulnerability
The ModSecurity module can be installed on Apache httpd, in order to filter queries. It is impacted by several vulnerabilities.

An attacker can use a complex url, in order to force the regular expression engine to consume resources. [severity:2/4; >]

ModSecurity does not detect complex path exiting from the root. [severity:2/4; >]

Some MIME multipart separators are not correctly analyzed. [severity:2/4; >]

An attacker can use a malformed cookie, in order to generate a memory leak during its analysis. [severity:2/4; >]

A remote attacker can therefore generate a denial of service on ModSecurity.

Characteristics
Title: ModSecurity: denials of service
Identifiers: BID-38156, FEDORA-2010-1862, FEDORA-2010-1903, MDVSA-2010:050, VIGILANCE-VUL-9411.
Url: https://vigilance.fr/tree/1/9411

Information sources
Publications and announces

Solutions for this vulnerability
Patch or workaround

Supplements

Vulnerability : PCRE
An attacker can use a complex url, in order to force the regular expression engine to consume resources.
Severity: 2/4.

Vulnerability : path normalization
ModSecurity does not detect complex path exiting from the root.
Severity: 2/4.

Vulnerability : multipart
Some MIME multipart separators are not correctly analyzed.
Severity: 2/4.

Vulnerability : cookie parser
An attacker can use a malformed cookie, in order to generate a memory leak during its analysis.
Severity: 2/4.



















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