Rule:

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Sid:
2449

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Summary:
This event is generated when an attempt is made to exploit a buffer 
overflow vulnerability associated with Ipswitch WS FTP ALLO command.

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Impact:
Remote access.  A successful attack may permit the remote execution of 
arbitrary commands with system privileges. A Denial of Service (DoS)
attack may also be possible.

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Detailed Information:
Ipswitch WS FTP is an FTP server. A vulnerability exists with the ALLO 
command that can cause a buffer overflow and permit the execution of 
arbitrary commands with system privileges. The buffer overflow can be 
caused by supplying an overly long argument to the ALLO command.

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Affected Systems:
	Ipswitch WS FTP Server 1.0.1 through 1.0.5, 2.0 through 2.0.4, 
	3.0 1, 3.0, 3.1, 3.1.1, 3.1.2, 3.1.3, 3.4, 4.0 2, 4.0 1 and 4.0
	Ipswitch WS_FTP Pro 6.0, 7.5, 8.0 3, 8.0 2

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Attack Scenarios:
An attacker can use one of the publicly available exploit scripts to
cause the overflow to occur.

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Ease of Attack:
Simple.  Many 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 the latest non-affected version of the software.

Use scp as an alternative to ftp

Disallow ftp access to internal resources from external sources

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

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Additional References:

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