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Modsecurity CVE-2012-2751

MEDIUM
2012-07-22 secalert@redhat.com
XSS Debian Oracle Debian Linux Http Server Modsecurity Opensuse Trustwave
4.3
CVSS 2.0 · NVD
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Vulnerability Assessment

Impact

CVSS score of 4.3 (MEDIUM). Attack characteristics: network attack vector, M complexity. EPSS exploitation probability: 1.94%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 1.9% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

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 include: Trustwave Modsecurity, Opensuse, Debian Debian Linux, Oracle Http Server. Version information: before 2.6.6.

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Severity by source

NVD PRIMARY 4.3 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
M
Confidentiality
None
Integrity
P
Availability
None

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score
1.9%
Top 16% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 1.9%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

24
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)CVE.org

cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:http_server:11.1.1.6.0:*:*:*:*:*:*:*

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References

Advisories & patches
REF http://blog.ivanristic.com/2012/06/modsecurity-and-modsecurity-core-rule-set-multipart-bypasses.html REF http://lists.opensuse.org/opensuse-updates/2013-08/msg00020.html REF http://lists.opensuse.org/opensuse-updates/2013-08/msg00025.html REF http://lists.opensuse.org/opensuse-updates/2013-08/msg00031.html REF http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/branches/2.6.x/CHANGES REF http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/CHANGES?r1=1920&r2=1919&pathrev=1920 REF http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/apache2/msc_multipart.c?r1=1918&r2=1917&pathrev=1918 REF http://secunia.com/advisories/49576 REF http://secunia.com/advisories/49782 REF http://www.debian.org/security/2012/dsa-2506 REF http://www.mandriva.com/security/advisories?name=MDVSA-2012:118 REF http://www.mandriva.com/security/advisories?name=MDVSA-2013:150 REF http://www.openwall.com/lists/oss-security/2012/06/22/1 REF http://www.openwall.com/lists/oss-security/2012/06/22/2 REF http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html REF http://www.securityfocus.com/bid/54156

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