Description
A remote code execution vulnerability exists in multiple Netcore and Netis routers models with firmware released prior to August 2014 due to the presence of an undocumented backdoor listener on UDP port 53413. Exact version boundaries remain undocumented. An unauthenticated remote attacker can send specially crafted UDP packets to execute arbitrary commands on the affected device. This backdoor uses a hardcoded authentication mechanism and accepts shell commands post-authentication. Some device models include a non-standard implementation of the `echo` command, which may affect exploitability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Netcore Technology | Router firmware | Prior to August 2014 | — |
| Netis | Router firmware | Prior to August 2014 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Metasploit 1 module
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Netcore Router Udp 53413 Backdoor
exploit/linux/misc/netcore_udp_53413_backdoor
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://web.archive.org/web/20140828114943/http://blog.trendmicro.com/trendlabs-security-intelligence/netis-routers-leave-wide-open-backdoor/ third-party-advisory technical-description
- https://www.seebug.org/vuldb/ssvid-90227 third-party-advisory technical-description
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/misc/netcore_udp_53413_backdoor.rb exploit
- https://www.shadowserver.org/what-we-do/network-reporting/netcore-netis-router-vulnerability-scan-report/ third-party-advisory
- https://vulners.com/metasploit/MSF:EXPLOIT-LINUX-MISC-NETCORE_UDP_53413_BACKDOOR- third-party-advisory exploit
- https://www.vulncheck.com/advisories/netcore-netis-routers-backdoor-rce third-party-advisory
- https://www.exploit-db.com/exploits/43387 exploit