| 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. Paraactivnexkin-dual-remux-p2p.part10.rar May 2026: This is the 10th segment of a multi-part compressed archive. You would need all the parts (part1, part2, etc.) to extract the actual movie file. Context & Safety : You cannot open or watch Part 10 on its own. You need every single RAR part in the set to successfully "unpack" the video. paraactivnexkin-dual-remux-p2p.part10.rar : This specific file name is associated with the unauthorized distribution of copyrighted film content. Encode) or how multi-part archives work? : This is the 10th segment of a : This is a high-quality format. A "remux" takes the raw video and audio streams directly from a Blu-ray disc and puts them into a new container (like .MKV) without re-compressing them. This results in the best possible picture and sound quality, identical to the physical disc. You need every single RAR part in the : Confirms it was released by an independent group on person-to-person sharing platforms rather than a traditional "Scene" group. : This is likely a shorthand or "scene" name for Paranormal Activity: Next of Kin , the 2021 supernatural horror film. : Downloading split .rar files from unverified P2P sources is a common way for malware to be distributed. Always ensure you have active antivirus software and verify the reputation of the source.
Avoid downloading files/directories from untrusted FTP servers.
Disclosure Timeline
2008-06-15 - Vulnerability Discovered. |
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