by Tan Chew Keong
Release Date: 2008-06-27
[en] [jp]
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.
Pmss-usa-decrtd-ziperto.rar Page
: The core mechanic revolves around collecting and using stickers to perform attacks. Every action in battle—from jumping to using a hammer—consumes a sticker from your inventory.
: Unlike previous RPG-heavy entries, this title focuses more on light platforming and using specific stickers to alter the environment (Paperize mode) to progress. Technical Details Platform : Nintendo 3DS Developer : Intelligent Systems Genre : Action-Adventure / Puzzle PMSS-USA-DecrTD-Ziperto.rar
Here are the key features and characteristics of this specific file and the game it contains: File-Specific Features : The core mechanic revolves around collecting and
: The game features a distinct visual style where the world and characters are made of paper, cardboard, and tape, leading to unique environmental puzzles. leading to unique environmental puzzles.
Patch / Workaround
Avoid downloading files/directories from untrusted FTP servers.
Disclosure Timeline
2008-06-15 - Vulnerability Discovered.
2008-06-16 - Vulnerability Details Sent to Vendor via online support form (no reply).
2008-06-18 - Vulnerability Details Sent to Vendor again via online support form (no reply).
2008-06-25 - Vulnerability Details Sent to Vendor again via online support form (no reply).
2008-06-27 - Public Release.