1888.txt

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Rule:

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Sid:
1888

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

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Impact:
Serious. Execution of arbitrary code is possible.

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Detailed Information:
Executing  site cpwd with an specially crafted argument can cause a buffer overflow in WS_FTP that would allow arbitrary code to be run on the ftp server.

The 'site cpwd' command seems to be unique to ws_ftp. This command is used to allow users to change there passwords while using an ftp session. It is possible to execute 'site cpwd' with an specially crafted argument can cause a buffer overflow in WS_FTP. This would allow arbitrary code to be run on the ftp server. This requires that the user be logged into the ftp server before executing the 'site cpwd' command.

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Affected Systems:
WS_FTP up to an including 3.12

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Attack Scenarios:
An attacker needs to authenticate to an ftp server running the affected software then supply a specially crafted command to cause the buffer overflow condition to occur.

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Ease of Attack:
Simple.

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False Positives:
'site cpwd' is a valid command on ws_ftp and users may be allowed to change their passwords.

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False Negatives:
None Known

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Corrective Action:
Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

Consider using scp as a secure replacement for ftp.

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Contributors:
Original rule writer unknown
Snort documentation contributed by Ian Macdonald
Sourcefire Vulnerability Research Team
Nigel Houghton <[e-mail]>

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Additional References:

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