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Check Point Advisories

Multiple Vendors BSD telnetd Encryption Key Buffer Overflow (CVE-2011-4862)

Check Point Reference: CPAI-2012-177
Date Published: 14 May 2012
Severity: Critical
Last Updated:
Source: CVE-2011-4862
Protection Provided by:

Security Gateway
R75

Who is Vulnerable? FreeBSD Project telnetd various
OpenBSD Project telnetd various
Red Hat telnetd various
Vulnerability Description A buffer overflow vulnerability has been reported in telnetd, an implementation of the Telnet daemon.
Vulnerability DetailsThe vulnerability is due to lack of validation of key length while copying an encryption key into a fixed-length buffer. A remote attacker could exploit this vulnerability by sending a specially crafted packet to telnetd. Successful exploitation would allow attackers to execute arbitrary code in the security context of the affected service.

Protection Overview

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

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

Security Gateway R75 / R71 / R70

  1. In the IPS tab, click Protections and find the Multiple Vendors BSD telnetd Encryption Key Buffer Overflow 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: Telnet Enforcement Violation
Attack Information: Multiple Vendors BSD telnetd Encryption Key Buffer Overflow

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