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Directory Traversal Vulnerability in TurboFTP Server

Advisory ID:HTB22514
Product:TurboFTP Server
Vendor:TurboSoft, Inc
Vulnerable Versions:1.20 Build 745 and probably prior
Tested Version:1.20 Build 745
Advisory Publication:July 19, 2010 [without technical details]
Vendor Notification:July 19, 2010
Public Disclosure:August 2, 2010
Vulnerability Type:Path Traversal [CWE-22]
Risk Level:Critical
CVSSv2 Base Score:9 (AV:N/AC:L/Au:S/C:C/I:C/A:C)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in TurboFTP Server which could be exploited to delete or execute arbitrary files on vulnerable system.

1) Directory Traversal Vulnerability in TurboFTP Server

The vulnerability exists due to insufficient sanitation of the filename in the "RNTO" and "SIZE" commands. A remote attacker can upload a malicious file on the target server and rename it using directory traversal sequences (e.g. "..\..\..\..\..\..\..\..\..\...Documents and Settings\All Users\Start Menu\Programs\Startup\file.exe"). It is also possible to delete arbitrary files on the target system outside the FTP root folder. Successful exploitation requires that attacker has write permissions on the FTP server.

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[1] High-Tech Bridge Advisory HTB22514 - - Directory Traversal Vulnerability in TurboFTP Server
[2] TurboFTP Server - - TurboFTP Server is a high performance, secure, scalable and management friendly FTP/SFTP server.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.

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