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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.

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Vulnerability Assessment Details

icmp leak

Vulnerability Assessment Summary
icmpleak check

Detailed Explanation for this Vulnerability Assessment

The remote host is vulnerable to an 'icmp leak' of
potentially confidential data. That is, when the
host generates an ICMP error packet other than
'destination unreachable', the error packet is
supposed to only contain the original message or
a portion of the original message.

Due to a bug in the remote TCP/IP stack, these ICMP
error messages will also contain fragments of the content
of the remote kernel memory.

A possible hacker may use this flaw to remotely sniff what is going into
the host's memory, especially network packets that it sees, and
obtain useful information such as POP passwords, HTTP authentication
fields, and so on.

Solution : Contact your vendor for a fix. If the remote host is running
Linux 2.0, upgrade to Linux 2.0.40.
See also :
Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 2003 Tenable Network Security

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