Rule:

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Sid:
2087

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Summary:
This event is generated when an attempt is made to exploit a known vulnerability in Sendmail.

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Impact:
The remote attacker can gain access to a machine with the credentials of the user running the Sendmail daemon, usually 'root'.

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Detailed Information:
A vulnerability exists in the Sendmail MTA Daemon that could allow an attacker the opportunity to gain root access.

A programming error exists such that a buffer overflow can be caused using the header fields in an SMTP session. Using the '<' and '>' characters in the 'from' field, an attacker can increment a counter to the extent that the buffer exceeds it's limit.

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Affected Systems:
All systems using Sendmail prior to version 8.12.8
	
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Attack Scenarios:
The attacker can craft an email message that contains a "from" header with enough sequences of "<>" to cause a counter to exceed it's maximum size thus causing the buffer overflow.

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Ease of Attack:
Simple

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
All users of Sendmail should upgrade to the latest non-affected version as soon as possible.

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Contributors:
Sourcefire Vulnerability Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

CERT:
http://www.cert.org/advisories/CA-2003-07.html

Sendmail:
http://www.sendmail.org/8.12.8.html

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