Tuesday morning Wordfence published a post showing how thousands of attacks we see on WordPress sites come from hacked home routers. In the past month alone we have seen over 57,000 unique home routers being used to attack WordPress sites. Those home networks are now being explored by hackers who have full access to them. They can access workstations, mobile devices, wifi cameras, wifi climate control and any other devices that use the home WiFi network.
Half of the internet service providers we analyzed have routers with a very specific vulnerability.
This vulnerability is known as the “misfortune cookie”. We will call it the MC vulnerability for short. It has been known for a few years and was first disclosed by CheckPoint in 2014. It is now being used to hack home routers. Using the tool below you can tell if you have the MC vulnerability.
The MC vulnerability exists in a service that your ISP uses to remotely manage your home router. That service listens on a “port” number, which is 7547. Besides the MC vulnerability, this port can have other vulnerabilities, one of which was disclosed a few months ago. Researchers have been discussing the dangers of port 7547 in home routers for a few years now.
Your ISP should not allow someone from the public internet to connect to your router’s port 7547. Only your ISP should be able to access this port to manage your home router. They have the ability to configure their network to prevent outsiders from accessing that port. Many ISPs do not block public access to port 7547.
You can use the tool below to determine if your port 7547 is open to the public internet. If it is, we suggest you contact your ISP and ask them to prevent outsiders from accessing that port on your home router. Even if you aren’t vulnerable to one of the two vulnerabilities we posted above, future vulnerabilities may emerge on port 7547. By blocking public access you will protect yourself and your home network.
Read the full article here https://www.wordfence.com/blog/2017/04/home-routers-attacking-wordpress/
How to check to check your router
What to do with the results?
If your router is vulnerable, we recommend that you:
- Immediately reboot your home router. This may flush any malware from your home router.
Upgrade your router firmware if you can to the newest version. Close port 7547 in your router config if you are able to. (Many routers don’t allow this)
- If you can’t upgrade your own firmware, immediately call your ISP and let them know you have a serious security vulnerability in your home router and you need help fixing it. You can point them to this blog post (the page you are on) and this CheckPoint website for more information. Let them know that your router has a vulnerability on port 7547 in “Allegro RomPager” that can allow an attacker to access your home network and launch attacks from your router on others.
- Run a virus scan on all your home workstations.
- Update all home workstations and devices to the newest versions of operating system and applications or apps.
- Update any firmware on home devices where needed.
If you are not vulnerable, but port 7547 is open, we recommend that you:
- Reboot your home router immediately. You may suffer from other port 7547 vulnerabilities.
- Upgrade your router firmware if you can.
- Close port 7547 on your router if you can. (Many routers don’t allow this)
- Contact your ISP and let them know that port 7547 on your home router is accessible from the public internet. Let them know that port 7547 is used by your ISP to manage the router. It should not be publicly available. Suggest that they filter access to that port to prevent anyone on the public internet accessing it.