vuln.sg  Fables 156.cbr

vuln.sg Vulnerability Research Advisory

AceFTP FTP-Client Directory Traversal Vulnerability

by Tan Chew Keong
Release Date: 2008-06-27

Fables 156.cbr   [en] [jp]

Fables 156.cbr 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.


Fables 156.cbr Tested Versions


Fables 156.cbr 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.


Fables 156.cbr 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,


Fables 156.cbr Patch / Workaround

Avoid downloading files/directories from untrusted FTP servers.


Fables 156.cbr 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.


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