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From: Jared DeMott (demottjamsu.edu)
Date: Thu Aug 23 2007 - 17:17:01 CDT
VDA Labs Advisory:
Ipswitch FTP XSS leads to FTP server compromise. The Vendor has been
notified, and given the PoC.
There is XSS vulnerability when the WS_FTP server logs client FTP
commands. All user commands are logged. When the FTP command is invalid
(error), special characters are converted to HTML chars (< = <, > =
>), and logged. However, when the FTP command is valid, there is no
the log file.
The WS_FTP administration interface (IIS web application written in ASP)
has a view log option. When logs are viewed, it is possible to steal
the administrator cookie, or even better, DIRECTLY create a new user (or
admin) account for FTP server.
We've created a little PoC that will create a new system administrator
account when the admin view logs. The PoC is simple and injects an
<iframe> that leads to another html file that creates the new account.
John Harwold, VDA Labs, LLC
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