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wsftp802.txt

wsftp802.txt
Posted Mar 16, 2004
Authored by John Layman

WS_FTP Pro versions 8.02 and below suffer from a buffer overrun when ASCII mode directory data is passed to the client from the server. If the data exceeds 260 bytes without a terminating CR/LF, the application will crash. Arbitrary code execution is possible.

tags | advisory, overflow, arbitrary, code execution
SHA-256 | 053fdbe09d3248b0bcb77193ec1300cfa9c274c9284e37fa1da31338c10879d8

wsftp802.txt

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Product: WS_FTP Pro v8.02 and probably earlier versions.
Vendor: Ipswitch

Vendor's Product Description:

WS_FTP Pro is the market leader in Windows-based FTP (file transfer protocol) client software. It enables users and organizations to move files between local and remote systems while enjoying the utmost in:

Problem:

WS_FTP Pro suffers a buffer over-run when ASCII mode directory data is passed to the client from the server, and this data exceeds 260 bytes without a terminating CR/LF. The application crashes with an error stating "instruction at 0xNNNNNNNN has addressed memory at ..." where 0xNNNNNNNN is a value in the overflowed buffer; suggesting that it is possible to cause WS_FTP Pro to continue execution at another location in memory - arbitrary code execution (?)

This problem can be demonstrated by creation of a long filename or directory name (250 bytes or more) in the ftp directory on the server, connecting to it and viewing the directory listing.

Fix:

Ipswitch was contacted about this problem, and version 8.03 appears to have solved it. Update!
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