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Vulnerability Assessment & Network Security Forums |
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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. Home >> Browse Vulnerability Assessment Database >> Misc. >> OpenSSH Reverse DNS Lookup bypass Vulnerability Assessment Details
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OpenSSH Reverse DNS Lookup bypass |
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Checks for the remote SSH version Detailed Explanation for this Vulnerability Assessment You are running OpenSSH-portable 3.6.1 or older. There is a flaw in this version which may permit a possible hacker to bypass the access controls set by the administrator of this server. OpenSSH features a mechanism which can restrict the list of hosts a given user can log from by specifying a pattern in the user key file (ie: *.mynetwork.com would let a user connect only from the local network). However there is a flaw in the way OpenSSH does reverse DNS lookups. If a possible hacker configures his DNS server to send a numeric IP address when a reverse lookup is performed, he may be able to circumvent this mechanism. Solution : Upgrade to OpenSSH 3.6.2 when it comes out Network Security Threat Level: Low Networks Security ID: 7831 Vulnerability Assessment Copyright: This script is Copyright (C) 2003-2006 Tenable Network Security |
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Cables, Connectors |
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