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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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Sendmail ETRN command DOS

Vulnerability Assessment Summary Checks the version number Detailed Explanation for this Vulnerability Assessment The remote sendmail server, according to its version number, permits remote attackers to cause a denial of service by sending a series of ETRN commands then disconnecting from the server, while Sendmail continues to process the commands after the connection has been terminated. Solution : Install sendmail version 8.10.1 and higher, or install a vendor supplied patch. Network Security Threat Level: Medium Networks Security ID: 904 Vulnerability Assessment Copyright: This script is Copyright (C) 2003 Xue Yong Zhi

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