Check Point Advisories

ProFTPD SReplace Function Buffer Overflow (CVE-2006-5815)

Vulnerability
Protection

Check Point Reference:	CPAI-2006-276
Date Published:	12 Oct 2009
Severity:	Medium
Last Updated:	Monday 12 October, 2009
Source:
Industry Reference:	CVE-2006-5815
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	The ProFTPD server is a full featured File Transfer Protocol (FTP) server mainly used in Linux distributions. Aside from the standard FTP features, the server supports a number of extensions. There exists a buffer overflow vulnerability in ProFTPD FTP server. The vulnerability is due to improper boundary checks in the SReplace function. A remote authenticated user can exploit the vulnerability by sending specially crafted commands to the FTP server. Exploitation may cause memory corruption, which in turn may result in injection and execution of arbitrary code. If the attack is not successful in code injection and execution, the instance of the target ProFTPD server process will terminate upon exploitation. This will result in termination of the connection on which the attack attempt has been made. The FTP service, however, will remain responsive and will continue to operate normally as it. This is due to the fact that for each new connection a new instance of the process is forked to handle the session. If an attack results in successful code injection and its subsequent execution, the behaviour of the target host will depend on the intention of the attacker. Note that any code execution will be within the security context of the affected service, normally a non-privileged user.

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

In the IPS tab, click Protections and find the ProFTPD SReplace Function Buffer Overflow protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: FTP Enforcement Violation.
Attack Information: ProFTPD SReplace function buffer overflow