What’s Vulnerable › Vulnerabilities

CVE-2012-2751

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-07-22 · updated 2026-06-16

Description

ModSecurity before 2.6.6, when used with PHP, does not properly handle single quotes not at the beginning of a request parameter value in the Content-Disposition field of a request with a multipart/form-data Content-Type header, which allows remote attackers to bypass filtering rules and perform other attacks such as cross-site scripting (XSS) attacks. NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-5031.

Affected products

• Debian Linux: 6.0, 7.0
• Opensuse: 11.4, 12.2, 12.3
• Oracle Corporation Oracle HTTP Server: 11.1.1.6.0
• Trustwave Modsecurity: before 2.6.6 — fixed in 2.6.6

How to fix

Upgrade to a fixed version: Trustwave Modsecurity 2.6.6. Check the vendor advisory for mitigations.

References

• http://blog.ivanristic.com/2012/06/modsecurity-and-modsecurity-core-rule-set-multipart-bypasses.html
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00020.html
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00025.html
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00031.html
• http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/branches/2.6.x/CHANGES
• http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/CHANGES?r1=1920&r2=1919&pathrev=1920
• http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/apache2/msc_multipart.c?r1=1918&r2=1917&pathrev=1918
• http://secunia.com/advisories/49576
• http://secunia.com/advisories/49782
• http://www.debian.org/security/2012/dsa-2506
• http://www.mandriva.com/security/advisories?name=MDVSA-2012:118
• http://www.mandriva.com/security/advisories?name=MDVSA-2013:150

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