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And even if the router has auto-update, check every now and then to make sure it is actually working, and the router firmware is up-to-date. If your router manufacturer hasn't released any updates to the firmware in the past 3-5 years, consider upgrading to a "newer" router
The researcher, Evan Grant (opens in new tab), isn't entirely at fault for this. He's the one who found the flaw (catalog number CVE-2021-20090 (opens in new tab)) back in January, after he took apart a Buffalo-branded router sold in Japan. A patch fixing the firmware flaw was released by Buffalo in April, after Tenable, the firm Grant works for, informed Buffalo.
The problem is that at least 36 other models of routers distributed by 20 different companies have identical or very similar flaws, and firmware patches may not be available yet for all of them. Few people even know that you need to update your router's firmware just as you need to update your computer or phone.
If you own your router, and you are somewhat technically skilled, then you should access the administrative settings to check the model number and firmware version. Plugging an Ethernet cable from a laptop into one of the router's Ethernet ports is the quickest way to do this.
If your router is one of the models on this list and the firmware is out of date, you'll need to check for updated firmware. We have a generic guide on how to update your router's firmware here, but in truth the procedure varies from model to model.
Some newer routers will update themselves, and others may have a mechanism within the administrative interface to check for firmware updates. Sometimes you'll have to go to the support website of the company whose name is on the router and see whether you can download an update from there.
One of the affected models appears to be the Verizon Fios G3100 (opens in new tab), a $300 Fios combination modem/router. We couldn't find any page on the Verizon website that might offer a firmware update, so we initiated a chat with a Verizon support representative.
We asked the technician on the chat whether the Verizon Fios G3100's firmware had been update to fix the CVE-2021-20090 flaw. The technician replied that they did not have the "in-depth knowledge" for the answer and gave us the generic Verizon contact page.
"Our security teams are actively addressing the recently reported router authentication bypass concerns. Verizon will provide an update to the Fios Router software and/or firmware to address the issue, which affects roughly 2% of our Fios router customers. There will be no action needed by the customer to receive this update."
It was a bit easier to find web pages with firmware updates for the four Asus models mentioned by Tenable as being potentially vulnerable. Unfortunately, none of the four appear to have received any new updates since at least December 2018.
Here are links to each model's firmware update page, if you'd like to check back later: DSL-AC88U (opens in new tab), DSL-AC87VG (opens in new tab), DSL-AC3100 (opens in new tab) and DSL-AC68VG (opens in new tab).
One of the Buffalo models, the WSR-2533DHPL2, contains two other firmware flaws, for which the Tenable blog post included proof-of-concept exploits. Buffalo has issued firmware updates for these as well.
"The vendor selling you the device is not necessarily the one who manufactured it," said Grant in his blog post. "If you find bugs in a consumer router's firmware, they could potentially affect many more vendors and devices than just the one you are researching."
Routers and modems running a version of the Arcadyan firmware, including devices from ASUS, Orange, Vodafone, and Verizon, are currently under attack from a threat actor attempting to ensnare the devices into their DDoS botnet.
Grant says the vulnerability has existed in the code for at least ten years and has made its way into the firmware of at least 20 router and modem models sold by 17 different vendors, which based their products on a white-label version of old Arcadyan devices.
Almost immediately after being disclosed publicly, a vulnerability with routers running Arcadyan firmware has been exploited by hackers, potentially affecting millions of home routers.Although this vulnerability was disclosed to router manufacturers in April, it was made public on August 3. There have been reports of hackers actively attacking these compromised routers since.
The vulnerability, referred to as CVE-2021-20090, is a critical path traversal vulnerability in the web interfaces of routers with Arcadyan firmware. The vulnerability allows remote attackers to bypass authentication. This makes it possible for attackers to deploy Mirai botnet malicious payloads to affected devices. 2ff7e9595c
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