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.
Fables: 156.cbr
Fables #156 is a meditation on whether heroes can ever truly retire. It suggests that for a Fable, the story only stops when you stop breathing, and even then, legends have a way of coming back to haunt the living.
When Fables ended in 2015, fans thought the book was closed. But with the 20-issue revival starting at #151, the stakes shifted from the grand, multiversal wars of the past to something more intimate and ancient. Issue #156 is a pivotal "mid-arc" moment where the new status quo—and the new threats—finally start to solidify. 1. The Burden of Legacy (Bigby & Snow) Fables 156.cbr
Issue #156 acts as a bridge. We move away from the initial "getting the band back together" vibe of #151-#155 and into the meat of the conflict. The pacing accelerates here, moving from cryptic warnings to direct confrontations. It’s an issue that rewards long-time readers with deep-cut references while making it clear that no one—not even the "unkillable" Bigby—is safe. Fables #156 is a meditation on whether heroes
"Fables #156" marks a major milestone in Bill Willingham’s long-running comic series, serving as the sixth chapter of the arc which revived the series after its initial 150-issue run. But with the 20-issue revival starting at #151,
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.