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.
Buy Synthetic Oil Online – Genuine
Include a tool to find the nearest oil recycling center Earth911 to encourage eco-friendly disposal.
Common grades like 0W-20, 5W-20, 5W-30, and 10W-30.
Allow users to narrow down options based on their owner's manual or driving habits. buy synthetic oil online
Integrates with an API to automatically pull vehicle specs. Result: A "Guaranteed to Fit" badge on compatible products. 2. Viscosity & Type Filters
Toggle between 1-quart bottles and 5-quart jugs (bulk is usually cheaper). Include a tool to find the nearest oil
Offer a "Subscribe & Save" feature for a 10% discount, delivering oil every 6 or 12 months.
A list of every vehicle the specific oil supports. 📦 Fulfillment & Retention Integrates with an API to automatically pull vehicle specs
Increase average order value by grouping items needed for a standard oil change. Oil + Oil Filter + Drain Plug Washer.
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.