Rule:

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Sid:
1550

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Summary:
This event is generated when an external attacker attempts to exploit a buffer overflow vulnerability in the ETRN command in NetWin DMail.

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Impact:
Severe. Remote execution of arbitrary code, leading to remote root compromise. 

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Detailed Information:
Some versions of NetWin DMail SMTP server contain a buffer overflow vulnerability in the ETRN command. An attacker can use an overly long string in an ETRN argument to cause a buffer overflow condition. This allows the attacker to crash the mail server or execute arbitrary code with root access. 

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Affected Systems:
Systems running NetWin DMail 2.8a-h or lower or NetWin DMail 2.7q or lower.

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Attack Scenarios:
An attacker sends an ETRN command with an overly long argument to a NetWin DMail SMTP server. The attacker can then crash the mail server or execute arbitrary code with root access. 

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Ease of Attack:
Simple. Exploits exist.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Upgrade to NetWin DMail 2.7r or 2.8i.

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Contributors:
Original rule written by Brian Caswell <bmc@sourcefire.com>
Sourcefire Research Team
Sourcefire Technical Publications Team
Jen Harvey <jennifer.harvey@sourcefire.com>

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Additional References:
CVE
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0204

Bugtraq
http://www.securityfocus.com/bid/1297

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