Check Point Advisories

Novell NetWare OpenSSH Buffer Overflow

Vulnerability
Protection

Check Point Reference:	CPAI-2010-411
Date Published:	13 Sep 2010
Severity:	High
Last Updated:	Monday 13 September, 2010
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	The Secure Shell (SSH) protocol is a well-established method of secure communication in a client and server architectural model. SSH is based on the idea of a public key exchange, where a server offers a client its public key. The client then uses this key to encrypt all communication between the two machines, including its own encryption key. A buffer stack-based overflow vulnerability exists in Novell Netware OpenSSH. The vulnerability is due to a boundary error in SSHD.NLM and SFTP-SVR.NLM modules when processing user sessions. A remote attacker may exploit this issue to inject and execute arbitrary code with admin privileges via sending an overly long string argument to the affected service. Successful exploitation could allow the attacker to execute arbitrary code on the affected service and may terminate abnormally.

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 Novell NetWare OpenSSH 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: SSH Protection Violation.
Attack Information: Novell NetWare OpenSSH buffer overflow