Check Point Advisories

Trustwave Holdings ModSecurity Chunked Transfer Encoding Policy Bypass (CVE-2013-5705)

Check Point Reference: CPAI-2014-1850
Date Published: 22 Oct 2014
Severity: High
Last Updated: Wednesday 22 October, 2014
Source:
Industry Reference:CVE-2013-5705
Protection Provided by:

Security Gateway
R77

  • R76
  • R75

    		•
    Who is Vulnerable? Trustwave: SpiderLabs ModSecurity prior to 2.7.6
    Vulnerability Description A policy bypass vulnerability has been reported in ModSecurity that could allow remote attackers to bypass Web Application Firewall (WAF) filters. The vulnerability is due to improper comparison of the user supplied input of the HTTP Transfer-encoding header field. A remote, unauthenticated attacker could exploit this vulnerability by sending a crafted HTTP request to send malicious payloads and bypass firewall filter policies.

    Protection Overview

    Security Gateway R77 / R76 / R75 / R71 / R70

    1. In the IPS tab, click Protections and find the Trustwave Holdings ModSecurity Chunked Transfer Encoding Policy Bypass protection using the Search tool and Edit the protection's settings.
    2. Install policy on all modules.

    SmartView Tracker will log the following entries:

    Attack Name:  Web Server Enforcement Violation.
    Attack Information:  Trustwave Holdings ModSecurity Chunked Transfer Encoding Policy Bypass

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