Rule:

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Sid:
655

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Summary:
This event is generated when a buffer overflow is attempted on a Sendmail 8.6.9 server.

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Impact:
Attempted administrator access.  A successful buffer overflow attack can allow a remote attacker access to the Sendmail server at the privilege level of the user ID associated with Sendmail.

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Detailed Information:
A vulnerability exists in Sendmail version 8.6.9 that can be exploited by a buffer overflow attack.  This allows the attacker access to the Sendmail server at the privilege level of the user ID associated with Sendmail.  This attack can occur when a Sendmail server connects back to the ident service of the client requesting the Sendmail connection.  Because it is improperly validated by the Sendmail server, a malicious response can cause a buffer overflow. 

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Affected Systems:
Sendmail version 8.6.9.

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Attack Scenarios:
An attacker can request a connection to a Sendmail server, listen for the request for the ident service, and respond with a malicious payload to exploit the vulnerability.

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Ease of Attack:
Easy.  Exploit code is available.

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False Positives:
None Known.

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False Negatives:
None Known.

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Corrective Action:
Apply the appropriate patch or upgrade to a Sendmail version greater than 8.6.9.

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Contributors:
Original rule written by Max Vision <vision@whitehats.com>
Rule updated by Brian Caswell <bmc@sourcefire.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-1999-0204


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