File: 1550.txt

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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:
	NetWin DMail 2.8a-h and prior
	NetWin DMail 2.7q and prior

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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:
Apply the appropriate vendor supplied patches

Upgrade to the latest non-affected version of the software

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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:

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