SID:
349
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Rule:
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Summary:
This event is generated when an attack attempt is made against an ftp server possibly running a vulnerable ftpd

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Impact:
Possible execution of commands on the affected server as with elevated user privileges

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Detailed Information:
The Washington University ftp daemon (wu-ftpd) has a problem with very  log directory names. There is insufficent checking on directories created by users allowing possible insertion of data into the stack.This can lead to execution of code with root / elevated user privileges.

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Affected Systems:
NcFTP Software NcFTPD 2.3.5
Washington University wu-ftpd 2.4.2 (beta 18) VR10 
RedHat wu-ftpd 2.4.2 b18-2 
Washington University wu-ftpd 2.4.2 academ[BETA-18] 
Probably others as well, susspect anything under Washington University wu-ftpd 2.6.0 for this particular exploit.

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Attack Scenarios:
A local attacker will attempt to create long named directories on the ftp server wich are not checked correctly in the server code. This can allow commands to be executed with elevated user privileges

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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:
Upgrade to newest version of wuftpd, or replace with something more secure.

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Contributors:
Snort documentation contributed by matthew harvey <indexone@yahoo.com>
Original Rule Writer Unknown
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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References:

OSVDB:
http://www.osvdb.org/248
http://www.osvdb.org/9163

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