#VU43809 Input validation error in ModSecurity - CVE-2009-5031

Vulnerability identifier: #VU43809

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2009-5031

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ModSecurity
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Trustwave

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

ModSecurity before 2.5.11 treats request parameter values containing single quotes as files, which allows remote attackers to bypass filtering rules and perform other attacks such as cross-site scripting (XSS) attacks via a single quote in a request parameter in the Content-Disposition field of a request with a multipart/form-data Content-Type header.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ModSecurity: 2.0.0 - 2.0.4, 2.1.0 - 2.1.6, 2.5.0 - 2.5.9

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External links
https://blog.ivanristic.com/2012/06/modsecurity-and-modsecurity-core-rule-set-multipart-bypasses.html
https://lists.opensuse.org/opensuse-updates/2013-08/msg00020.html
https://lists.opensuse.org/opensuse-updates/2013-08/msg00025.html
https://lists.opensuse.org/opensuse-updates/2013-08/msg00031.html
https://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/branches/2.6.x/CHANGES
https://secunia.com/advisories/49576
https://www.openwall.com/lists/oss-security/2012/06/22/1
https://www.openwall.com/lists/oss-security/2012/06/22/2
https://www.securityfocus.com/bid/54156
https://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf
https://www.modsecurity.org/fisheye/browse/modsecurity/m2/branches/2.5.x/apache2/msc_multipart.c?r2=1419&r1=1366

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.