| 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. P8if0hg6.rar -: Attachments shared on technical boards where users post logs or specific fix-it tools. How to Safely Open p8if0hg6.rar : If the file asks for a password, check the source website where you found the link. Often, the password is the name of the website (e.g., ://example.com ). : Once extracted, look for a .txt or .pdf file inside. This usually contains the installation instructions or a description of the contents. Troubleshooting Common Issues p8if0hg6.rar : If you extract it and find a .bin or .dat file, these are usually data files meant to be read by a specific program, not opened manually. Verdict: Should You Keep It? Since the filename is non-descriptive, you should prioritize security before opening it. : Attachments shared on technical boards where users Files with randomized names like "p8if0hg6" are frequently found in: : Custom maps, skins, or "mod packs" for games like Minecraft , The Sims , or GTA V . : Once extracted, look for a Understanding and Troubleshooting "p8if0hg6.rar" Because filenames like this are often generated by compression tools or automated build systems, they can be difficult to identify without context.
Avoid downloading files/directories from untrusted FTP servers.
Disclosure Timeline
2008-06-15 - Vulnerability Discovered. |
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