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Directory Traversal Vulnerability in FTP Explorer

Advisory ID:HTB22524
Product:FTP Explorer
Vendor:FTPx Corp
Vulnerable Versions: for Windows and probably prior
Tested Version: for Windows
Advisory Publication:July 22, 2010 [without technical details]
Vendor Notification:July 22, 2010
Public Disclosure:August 5, 2010
Vulnerability Type:Path Traversal [CWE-22]
CVE Reference:CVE-2010-3101
Risk Level:High
CVSSv2 Base Score:7.6 (AV:N/AC:H/Au:N/C:C/I:C/A:C)
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in FTP Explorer which could be exploited to execute arbitrary code on vulnerable system.

1) Directory Traversal Vulnerability in FTP Explorer: CVE-2010-3101
The vulnerability exists due to insufficient sanitation of the downloaded filename. A remote attacker controlling an FTP server can trick user into downloading file with specially crafted filename, containing directory traversal sequences (e.g. "..\..\..\..\..\..\..\somefile.exe") and write it into arbitrary locations on the target system. Successful exploitation might allow remote code execution but requires that victim uses FTP Explorer to connect to the FTP server and download a malicious file.

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Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.

[1] High-Tech Bridge Advisory HTB22524 - - Directory Traversal Vulnerability in FTP Explorer
[2] FTP Explorer - FTP Explorer is a popular ftp client that supports multiple simultaneous transfers, resumption of interrupted downloads, directory caching, and command queuing.
[3] Common Vulnerabilities and Exposures (CVE) - - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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