Check Point Advisories

Apache2 PHP Component Chunked Transfer Encoding Policy Bypass (CVE-2013-5705; CVE-2018-17082)

Check Point Reference: CPAI-2014-1850
Date Published: 1 Oct 2014
Severity: High
Last Updated: 21 Oct 2018
Industry Reference:CVE-2013-5705
Protection Provided by:

Security Gateway
R80, R77, R75

Who is Vulnerable? Trustwave: SpiderLabs ModSecurity prior to 2.7.6
Apache2 component in PHP before 5.6.38, 7.0.x before 7.0.32, 7.1.x before 7.1.22, and 7.2.x before 7.2.10
Vulnerability Description A cross-site scripting vulnerability exists in Apache2 PHP component. 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. Successful exploitation of this vulnerability would allow remote attackers to inject an arbitrary web script into the affected system.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Apache2 PHP Component Chunked Transfer Encoding Policy Bypass protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Web Server Enforcement Violation.
Attack Information:  Apache2 PHP Component Chunked Transfer Encoding Policy Bypass

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