Permissions, Privileges, and Access Controls in Trustwave ModSecurity

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU41813

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-2013-5705

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

Exploit availability: No

Description

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

apache2/modsecurity.c in ModSecurity before 2.7.6 allows remote attackers to bypass rules by using chunked transfer coding with a capitalized Chunked value in the Transfer-Encoding HTTP header.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ModSecurity: 2.0.0 - 2.7.4

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:*:*:*:*:*:*:*
• cpe:2.3:a:trustwave:modsecurity:2.7.4:*:*:*:*:*:*:*

External links

https://martin.swende.se/blog/HTTPChunked.html
https://www.debian.org/security/2014/dsa-2991
https://github.com/SpiderLabs/ModSecurity/commit/f8d441cd25172fdfe5b613442fedfc0da3cc333d

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.