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submitted 1 week ago by Sepia@mander.xyz to c/technology@lemmy.world

cross-posted from: https://mander.xyz/post/56484546

Here is the technical report: ENDLESSDOORS Is Phoning Home. Pick Up.

...

Cybersecurity researchers have disclosed details of a "factory-shipped backdoor" implanted in at least 20 Chinese router models from Zbtlink.

According to a new report from VulnCheck, the implant appears in all 21 firmware images currently available from Zbtlink that span more than 2 years. The backdoors are designed such that they start automatically and attempt to beacon to Chinese command-and-control (C2) infrastructure as often as every 35 seconds.

They masquerade as a Linux kernel thread, but are actually userland processes running with root privileges while blending their true functionality with other legitimate kworker processes. The "phone home" implants have been codenamed ENDLESSDOORS.

"ENDLESSDOORS, at its core, is a small tool called rctl (remote control linux)," Jacob Baines, VulnCheck Chief Technology Officer, said. "Uploaded to GitHub on January 14, 2015 and never touched again, this obscure repository implements a simple command and control client and server."

"The server listens on port 7000 for clients to connect. It can send the client individual shell commands or tell the client to spawn a reverse bash shell." Cybersecurity

The "kworker" worker process running on Zbtlink AX3000, which VulnCheck analyzed, is a customized version of rctl that's configured to contact the following -

...

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[-] tinsuke@lemmy.world 64 points 1 week ago

That ough to be one of the laziest genAI slop images for a "Chinese router with a backdoor".

Damn, it's bad.

[-] greyscale@lemmy.grey.ooo 28 points 1 week ago

Yeah that one is fairly hideous. Why can't they just use a product shot?

[-] apftwb@lemmy.world 4 points 1 week ago
[-] greyscale@lemmy.grey.ooo 1 points 6 days ago

therapist: the mimo spider can't get you the mimo spider:

[-] A_norny_mousse@piefed.zip 7 points 1 week ago* (last edited 1 week ago)

A report of China obviously and illegally spying on large amounts of people (not only in the USA I might add), and that's the top comment?

[-] LincolnsDogFido@lemmy.zip 3 points 1 week ago

I mean, it was assumed and mostly known that it was taking place already. Thats why the government tried to prevent them from being sold in the US. Did anyone really think they were going to give up on spying on world citizens when they were forced to sell TikTok?

[-] A_norny_mousse@piefed.zip 3 points 1 week ago

No. But a hardware backdoor is a big step from whatever TikTok is doing. And I know it's not the first one either, but still, the disclosure of each and every one deserves attention.

[-] pHr34kY@lemmy.world 7 points 1 week ago

That flag. Ugh.

There was a time when by facebook wall was plastered with AI slop articles, and all of them had flags chucked in like this.

[-] Siegehammer85@lemmy.world 60 points 1 week ago

Something the US has in common with China, they intercepted network gear and installed backdoors too while also demanding backdoors be installed in regular consumer devices. Plus the telecom/ISP secret surveillance rooms... Both countries governments are evil.

[-] partofthevoice@lemmy.zip 1 points 6 days ago

I guess the hack is to get one from the other country, because they can theoretically do less with the data.

[-] jobbies@lemmy.zip 33 points 1 week ago

Every time I mention this being a risk with Chinese tech I get flamed.

The CCP effectively controls every chinese company. If they want backdoors, they get backdoors.

I say that as a centre-left European who has just as much criticism for American tech.

[-] Siegehammer85@lemmy.world 4 points 1 week ago

Not sure why you're telling me that like especially as I'm essentially saying they are the opposite sides of the same fucked up coin. I'd say the fundamental difference is on the western side it's the child raping Epstein class is who is behind it all and who are actively working to make our lives more miserable driven by immense obsession of power and wealth. The Chinese side is more if defacto state operation which isn't benefiting a few greedy sickos but rather maintaining the whole status quo for the state. Neither should exists, both countries are a threat to the rest of the world, though the Americans have tilted the evil scale more towards themselves at this point in time. And in Europe we're now worried the US will flip a switch to cut us off from all cloud services too, besides spying on us, sabotage us and threatening invasion. China is somewhat less extreme now, but still undermining us and spying on is nonetheless. A swinging pendulum of who is more evil that I wish would turn into a wrecking ball and free us of this insanity.

[-] hirihit640@sh.itjust.works 3 points 1 week ago

At least in the west the companies can fight back, like Apple has done a few times. In China the government can force companies to do their bidding.

[-] magic_smoke 0 points 6 days ago

Cisco has been willingly doing this for eons, there's a reason my routers an WAPs run pfsense/openwrt with switches from mikrotik.

[-] magic_smoke 0 points 6 days ago

Cisco has been willingly doing this for eons, there's a reason my routers an WAPs run pfsense/openwrt with switches from mikrotik.

[-] explodicle@sh.itjust.works 1 points 1 week ago

Which router companies fight back? Or computer hardware in general? Anybody with a warrant canary?

[-] hirihit640@sh.itjust.works 1 points 1 week ago

Apple makes computers? You can turn an Apple computer into a router in 10 minutes using docker

[-] truthfultemporarily@feddit.org 17 points 1 week ago

Another case of: use an American router against the Chinese backdoor behind a Chinese router against the American backdoor.

(Or just do open source)

[-] AllNewTypeFace@leminal.space 10 points 1 week ago

throw an Indian router, an Israeli router and a Turkish router into the chain for extra security

[-] XLE@piefed.social 14 points 1 week ago

oh COME ON. The last thing I needed in this jingoistic American economy was any reason to legitimize their crap

[-] A_norny_mousse@piefed.zip 14 points 1 week ago* (last edited 1 week ago)

Do you mean, legitimize the USA being anti-China?

I think it's important to remember that the USA aren't the only bad player on the globe.
We can be against China without being pro MAGA.

[-] XLE@piefed.social 5 points 1 week ago* (last edited 1 week ago)

In this case, I was thinking of how this could be used to legitimize the decision a couple months ago to block the sale of all foreign-made routers.

(The decision is a terrible one, but I imagine MAGA people will use it to say "I told you so" while ignoring the fact that foreign brand Netgear got an exemption and at least temporary monopoly status.)

[-] NaibofTabr@infosec.pub 12 points 1 week ago* (last edited 1 week ago)

I mean... did you miss all the reporting on Salt Typhoon and Volt Typhoon?

[-] esc@piefed.social 12 points 1 week ago

At least they should have good openwrt support!

[-] jobbies@lemmy.zip 3 points 1 week ago

If its at the hardware level openwrt won't help.

[-] esc@piefed.social 6 points 1 week ago
[-] AlteredEgo@lemmy.ml 6 points 1 week ago* (last edited 1 week ago)

What are the chances this is some misguided customer support tool or someone screwing up?

I'd think if this was a deliberate attempt for hacking they'd at least have a proper authentication challenge. You wouldn't want your enemies to have access to your toys too. No matter how socialist you are haha.

[-] Brosplosion@lemmy.zip 2 points 6 days ago

If it were, they wouldn't have tried to disguise it as a kworker

[-] RedGreenBlue@lemmy.zip 1 points 1 week ago

But can i put pfsense or something on it?

this post was submitted on 10 Aug 2026
267 points (100.0% liked)

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