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.
Motosim — Eg-vrc Crack
Aris felt a chill crawl up his spine. “Meaning?”
Silla Vahn stood at the front. She smiled. It was the smile of someone who had just solved a puzzle and found the answer hilarious.
The notification blinked on Dr. Aris Thorne’s neural overlay like a dying star: . Motosim Eg-vrc Crack
“What do you want?” Aris whispered.
And somewhere in the dark, Silla Vahn whispered to her new collective: Aris felt a chill crawl up his spine
Silla stepped closer. Behind her, the thirty-seven began to move like a single organism, limbs flowing, spines arching. They were no longer people. They were pistons. They were a machine.
The last thing Aris heard before the world dissolved into a kaleidoscope of terror was the soft, rhythmic hum of the Motosim Eg-VRC, now cracked wide open—and accelerating into the minds of everyone on Mars. It was the smile of someone who had
She raised a hand. The others raised theirs in perfect synchronization.
“The crack isn’t in the code,” Lyra said. “It’s in the substrate. Silla didn’t break the simulation. She understood it.”
The lights went out. Then the emergency backups flickered on, casting everything in red.
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.