Permissions, Privileges, and Access Controls in Trustwave ModSecurity

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU43224

Risk: Medium

CVSSv4.0: 5.5 [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:P/U:Green]

CVE-ID: CVE-2012-4528

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

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

The mod_security2 module before 2.7.0 for the Apache HTTP Server allows remote attackers to bypass rules, and deliver arbitrary POST data to a PHP application, via a multipart request in which an invalid part precedes the crafted data.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ModSecurity: 2.0.0 - 2.6.8

CPE2.3

• cpe:2.3:a:trustwave:modsecurity:2.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:trustwave:modsecurity:2.1.6:*:*:*:*:*:*:*
• cpe:2.3:a:trustwave:modsecurity:2.5.13:*:*:*:*:*:*:*
• cpe:2.3:a:trustwave:modsecurity:2.6.8:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2012-November/093011.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/2.7.x/CHANGES
https://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/apache2/msc_multipart.c?sortby=date&r1=2081&r2=2080&pathrev=2081
https://mod-security.svn.sourceforge.net/viewvc/mod-security?view=revision&sortby=date&revision=2081
https://seclists.org/fulldisclosure/2012/Oct/113
https://www.openwall.com/lists/oss-security/2012/10/18/14
https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20121017-0_mod_security_ruleset_bypass.txt

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.