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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the telnet packages
Detailed Explanation for this Vulnerability Assessment
Updated telnet packages that fix two buffer overflow vulnerabilities are
This update has been rated as having important security impact by the Red
Hat Security Response Team.
The telnet package provides a command line telnet client. The telnet-server
package includes a telnet daemon, telnetd, that supports remote login to
the host machine.
Two buffer overflow flaws were discovered in the way the telnet client
handles messages from a server. A possible hacker may be able to execute
arbitrary code on a victim's machine if the victim can be tricked into
connecting to a malicious telnet server. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the names CVE-2005-0468
and CVE-2005-0469 to these issues.
Additionally, the following bugs have been fixed in these erratum packages
for Red Hat Enterprise Linux 2.1 and Red Hat Enterprise Linux 3:
- telnetd could loop on an error in the child side process
- There was a race condition in telnetd on a wtmp lock on some occasions
- The command line in the process table was sometimes too long and caused
bad output from the ps command
- The 8-bit binary option was not working
Users of telnet should upgrade to this updated package, which contains
backported patches to correct these issues.
Red Hat would like to thank iDEFENSE for their responsible disclosure of
Solution : http://rhn.redhat.com/errata/RHSA-2005-327.html
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Tenable Network Security
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