Vulnerability Assessment & Network Security Forums
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
Attempts to log in as -fbin
Detailed Explanation for this Vulnerability Assessment
It is possible to log into the remote system using telnet without
supplying any credentials
The remote version of telnet does not sanitize the user-supplied
'USER' environement variable. By supplying a specially malformed
USER environment variable, a possible hacker may force the remote
telnet server to believe that the user has already authenticated.
For instance, the following command :
telnet -l '-fbin' targethost
Will result in obtaining a shell with the rights of the 'bin'
Install patches 120068-02 (sparc) or 120069-02 (i386)
which are available from Sun.
Filter incoming to this port or disable the telnet service
and use SSH instead, or use inetadm to mitigate this
problem (see the link below).
See also :
Network Security Threat Level:
Critical / CVSS Base Score : 10
Networks Security ID: 22512
Vulnerability Assessment Copyright: This script is Copyright (C) 2007 Tenable Network Security, Inc.
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