Rule:

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Sid:
664

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Summary:
This event is generated when maliciously formatted "rcpt to" text is supplied to Sendmail.

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Impact:
Attempted administrator access.  A successful attack can allow remote execution of commands with root privleges.

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Detailed Information:
A vulnerability exists in older versions of Sendmail that incorrectly parses message headers.  This can allow a malicious user to execute arbitrary commands as root.

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Affected Systems:
Sendmail versions prior to 8.6.10 and any version based on 5.x.

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Attack Scenarios:
An attacker can craft a malicious mail header that executes a command.

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Ease of Attack:
Easy.  Use a maliciously formatted header.

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False Positives:
None Known.

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False Negatives:
None Known.

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Corrective Action:
Upgrade to version 8.6.10 or higher of Sendmail.

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Contributors:
Original rule written by Max Vision <vision@whitehats.com>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0203

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