| vuln.sg Vulnerability Research Advisory |
by Tan Chew Keong 
Summary
A vulnerability has been found within the FTP client in AceFTP. When exploited, this vulnerability allows an anonymous attacker to write files to arbitrary locations on a Windows user's system.
Tested Versions
Details
This advisory discloses a vulnerability within the FTP client in AceFTP. When exploited, this vulnerability allows an anonymous attacker to write files to arbitrary locations on a Windows user's system. The FTP client does not properly sanitise filenames containing directory traversal sequences (forward-slash) that are received from an FTP server in response to the LIST command. An example of such a response from a malicious FTP server is shown below. Response to LIST (forward-slash): -rw-r--r-- 1 ftp ftp 20 Mar 01 05:37 /../../../../../../../../../testfile.txt\r\n By tricking a user to download a directory from a malicious FTP server that contains files with fowward-slash directory traversal sequences in their filenames, it is possible for the attacker to write files to arbitrary locations on a user's system with privileges of that user. An attacker can potentially leverage this issue to write files into a user's Windows Startup folder and execute arbitrary code when the user logs on.
POC / Test Code
Please download the POC here and follow the instructions below. Kings Of Convenience Discography Lossless Flac Exclusive -Start your collection today. Search your preferred store for "Kings of Convenience FLAC" and hear the difference. In the quiet corner of the musical universe where melancholy meets melody, the Norwegian duo Kings of Convenience has held a sacred space for over two decades. For the casual listener, a 320kbps MP3 of “I’d Rather Dance with You” might suffice. But for the discerning ear—the audiophile, the archival collector, the owner of a tube amplifier and Sennheiser HD 800s— lossless is the only acceptable format. kings of convenience discography lossless flac exclusive While the world streams 128kbps audio through phone speakers, you can be part of an exclusive club—the one that hears the silence between the notes. Assemble your FLACs, calibrate your DAC, and listen to "24-25" in 24-bit. You will never go back to lossy again. Start your collection today
Avoid downloading files/directories from untrusted FTP servers.
Disclosure Timeline
2008-06-15 - Vulnerability Discovered. |
| Contact |
| For further enquries, comments, suggestions or bug reports, simply email them to |