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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Netcore Technology Router firmware
Default version status: affected
Prior to August 2014affected
Netis Router firmware
Default version status: affected
Prior to August 2014affected
References
- https://web.archive.org/web/20140828114943/http://blog.trendmicro.com/trendlabs-security-intelligence/netis-routers-leave-wide-open-backdoor/ ↗
- https://www.seebug.org/vuldb/ssvid-90227 ↗
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/misc/netcore_udp_53413_backdoor.rb ↗
- https://www.shadowserver.org/what-we-do/network-reporting/netcore-netis-router-vulnerability-scan-report/ ↗
- https://vulners.com/metasploit/MSF:EXPLOIT-LINUX-MISC-NETCORE_UDP_53413_BACKDOOR- ↗
- https://www.vulncheck.com/advisories/netcore-netis-routers-backdoor-rce ↗
- https://www.exploit-db.com/exploits/43387 ↗