| vuln.sg Vulnerability Research Advisory |
by Tan Chew Keong 
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. Blazon Out -: In classic works like Spenser’s, the phrase appears in contexts where hiding names is preferred over "telling them to blazon out their blames" (making their faults public). : Historically used to describe the act of spreading news, such as a trumpet used to "blazon out God's greatness" rather than just making noise. blazon out : It refers to the official description or technical drawing of the features on a coat of arms or shield. Historical & Contextual Examples : In classic works like Spenser’s, the phrase Blazon out - Definition, Meaning & Synonyms - Vocabulary.com Historical & Contextual Examples Blazon out - Definition, : In the game Evony: The King's Return , "Blazons" refer to a specific type of gear set with unique bonuses like "Soul," "Justice," or "Valor" that provide buffs to troops. Common Synonyms Proclaim : To declare publicly and officially. Trumpet : To announce loudly or boastfully. Blare out : To announce with a loud, often harsh sound. Publicize : To call wide attention to something. verb. proclaim or announce in public. synonyms: cry. announce, denote. make known; make an announcement. Vocabulary.com : In a literary "blazon," a poet catalogues the physical attributes of a subject (usually a woman) to praise them.
Avoid downloading files/directories from untrusted FTP servers.
Disclosure Timeline
2008-06-15 - Vulnerability Discovered. |
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