Slashdot Mirror


AT&T Uverse Modems Found To Have Several Serious Security Vulnerabilities (threatpost.com)

dustman81 writes: AT&T Uverse modems were found to have several serious vulnerabilities, including a superuser account with hardcoded username/password exposed to the internet via SSH, a HTTP server with little authentication which allows command injection, and an internet exposed service which exposes internal clients to external attacks. Information security consulting and software development firm Nomotion reports the findings in their blog: "It was found that the latest firmware update (9.2.2h0d83) for the NVG589 and NVG599 modems enabled SSH and contained hardcoded credentials which can be used to gain access to the modem's 'cshell' client over SSH. The cshell is a limited menu driven shell which is capable of viewing/changing the WiFi SSID/password, modifying the network setup, re-flashing the firmware from a file served by any tftp server on the internet, and even controlling what appears to be a kernel module whose sole purpose seems to be to inject advertisements into the user's unencrypted web traffic. Although no clear evidence was found suggesting that this module is actually being used currently, it is present, and vulnerable. Aside from the most dangerous items listed above, the cshell application is also capable of many other privileged actions. The username for this access is remotessh and the password is 5SaP9I26." The report continues to detail the other vulnerabilities: Default credentials 'caserver' https server NVG599; Command injection 'caserver' https server NVG599; Information disclosure/hardcoded credentials; and Firewall bypass no authentication.

Further reading: FierceTelecom; The Register

75 comments

  1. Trust Issues by Fragholio · · Score: 1

    And these companies are supposed to be trusted with actually securing the data that we provide them? I often wonder how non-IT people handle these business practices.

    --
    412077696e6e657220697320796f7521da
    1. Re:Trust Issues by PolygamousRanchKid+ · · Score: 5, Interesting

      And these companies are supposed to be trusted with actually securing the data that we provide them?

      No, that's incorrect. A big part of their business is providing private data to security services: see Lawful Interception (LI) https://en.wikipedia.org/wiki/...

      They are coerced by government agencies to do this. And just about every government passes laws requiring that ISPs and Telcos implement components that allow the security services to "just drop in" whenever they want. Usually, the government agencies are supposed to obtain warrants before tapping and sipping up someone's data, but these days . . . who's checking warrants any more . . . ?

      I worked on an ISP platform for a major telco in Europe, and it was interesting to see their LI system. Even the ISP operators themselves are not able to determine who and when the government is tapping. This is done so the "enemies" can't smuggle in mole operators into the ISPs who could alert their friends outside not to talk too loud on the line.

      Someone just found one of these hidden features for "special" users in AT&T.

      That's all.

      --
      Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    2. Re:Trust Issues by Anonymous Coward · · Score: 0

      Very soon, no routers out of the box will be trusted, and like people stepping on the foreign VPN bandwagon, and some percentage of those using advanced configuarations - will buy open-hardware to drop packets that don't belong.
      We can take checksums of the offending modules and do regression tests on others, now.

      As for firmware, flashing is no solution because there is also, mostly an A / B and C partition in the eeprom that LI can fallback to.
      What is needed is some check-summing of eeproms that mangles hidey holes of storage. Yet no AV company does this, and custom firmware sites for profit, are having a hard time. With Mobos with 'Management' modules, there needs to be streamlining of gunk.

      The take home message is back doors and exploits are being found faster. It is now approaching the level where phone firmware may be outed and a listed share sink 20% overnight if revealed. Crude, sloppy measures in modems have to end now, before people start selling firmware mods that yell out WHEN you are probed.

  2. They need true bridge mode!! by Joe_Dragon · · Score: 4, Insightful

    They need true bridge mode!!

    1. Re:They need true bridge mode!! by jmcharry · · Score: 2

      Their older DSL modems used to operate purely as a modem if you connected using PPPoE. I don't know whether that is still an option. Of course then you have to provide your own firewall, NAT, and DHCP.

    2. Re:They need true bridge mode!! by starblazer · · Score: 1

      Supposedly there's a certificate on the modem which is needed for authentication preventing true bridge mode. I don't know how true it is because I've swapped out modems before for friends and I've never had an issue where a modem hasn't come back online provided the circuit is still active.

    3. Re:They need true bridge mode!! by arth1 · · Score: 1

      Of course then you have to provide your own firewall, NAT, and DHCP.

      You don't have to. Firewall and NAT is generally a good idea, but DHCP is just a convenience - static IPs work well too, and for IPv6, you can also auto-assign IP addresses on the host side without DHCP.

    4. Re:They need true bridge mode!! by aaarrrgggh · · Score: 1

      You can put them in bridge mode, but that doesn't change much. They are still capable of "remote management".

    5. Re: They need true bridge mode!! by Anonymous Coward · · Score: 0

      Yes, which every off the shelf router does out of the box.

    6. Re:They need true bridge mode!! by Anonymous Coward · · Score: 0

      I tested the vulnerabilities on my own NVG589 (albeit the last firmware 9.1.6h1d25) and the issues were not present. Also, I'm running in IP passthru mode (to my own internal router / firewall) and others have been reporting that even on the affected firmware that these ports are closed when in IP passthru mode. Granted, most regular users aren't likely to be using their gateway modem as a pure modem and are using it as their sole firewall and router.

      While I'm also in the 'tad miffed' camp that the L/P were posted, at least the blogger does give instructions on how to close the ports (slight silver lining?)

  3. AT&T sold out to the NSA by Anonymous Coward · · Score: 0

    No way any of their gear is allowed in my home or on my person

  4. War driving made easy. by Anonymous Coward · · Score: 2, Funny

    Get an AT&T UVerse coverage map and go a driving in those areas.

    Just think of all the kitty porn you can get!

    Tera and tera bytes of "I has Cheezburgers!"

  5. I Thought The Whole AT&T Network by zenlessyank · · Score: 1

    was a back door.

  6. comcast business forces you to rent there hardware by Joe_Dragon · · Score: 1

    comcast business (static ip) forces you to rent there hardware.

    ATT forces you to rent there hardware.

    We need to ban ISP's from forcing you to rent there hardware or force them to just give out an dumb open all e-net handoff.

  7. Arrest the board by Dog-Cow · · Score: 1

    The entire board of directors should be rotting in jail for allowing foreign agents to infiltrate US computer systems. Traitors and incompetent assholes, every single one.

    1. Re: Arrest the board by Anonymous Coward · · Score: 0

      Don't worry, the only reason AT&T's incompetence and shenanigans have come to light is because The Donald is on the case now and he is, as we all know, really down with the cyber. Lock them up!

    2. Re: Arrest the board by Anonymous Coward · · Score: 0

      This was his plan all along.

      He's going to take all the broken and exploitable modems and use them to build a wall. Problem solved. A wall of modems.

    3. Re:Arrest the board by arth1 · · Score: 2

      The entire board of directors should be rotting in jail for allowing foreign agents to infiltrate US computer systems.

      I'd rather have foreign agents being able to access my systems than native agents. The foreign agents have far less power to use the data in a way that's harmful to me or my interests.

      Giving native agencies access, on the other hand, is deeply scary, for a multitude of reasons, including democracy. It's we the people who are supposed to be their bosses, not feudal lords and kings telling them what to do to whom.

    4. Re: Arrest the board by Anonymous Coward · · Score: 0

      Yes, only the Precedent had the technical insight to realize that all those old firewalls could be recycled to make a real wall, but of fire! Furthermore, he insisted it will be powered by the finest American coal via the new West Virginia-Texas pipeline and in a shining example of his genius the meter will be on the Mexican side.

  8. AT&T is a multibillion $ company by Anonymous Coward · · Score: 1

    There's only one explanation for such disgusting, juvenile engineering: Malevolence, not incompetence.

    1. Re:AT&T is a multibillion $ company by Anonymous Coward · · Score: 0

      having worked in several of these size companies and one of their competitors. No its incompetence. No one. I mean NO ONE gives a flying fuck if it is right or works. Just that they spun the line up and are sending in the checks. That is all they care about. When you are about to 'walk' they will let you. Unless you are a marque account. Suddenly they are all about fixing things. Right up until you pay the bill. Then crickets.

  9. Re:comcast business forces you to rent there hardw by Anonymous Coward · · Score: 2, Funny

    Instead, they should force you to rent here hardware.

    That makes a lot more sense.

  10. Re: comcast business forces you to rent there hard by mprindle · · Score: 4, Informative

    The last I checked I could buy my own modem and use it on my Comcast service to avoid the rental fees. They even publish a list of approved modems.

    Home
    https://mydeviceinfo.xfinity.c...
    Business
    https://business.comcast.com/h...

  11. Well fucking Doh!!! by khz6955 · · Score: 0

    "AT&T Uverse modems were found to have several serious vulnerabilities, including a superuser account with hardcoded username/password"

    Look it, most/all consumer grade equipment has built-in back-doors, by the various security services, get used to it.

  12. Re: comcast business forces you to rent there hard by Dunbal · · Score: 1

    They even publish a list of approved modems.

    Only way to make the legit approved list is if they also contain officially backdoored hard/firmware?

    --
    Seven puppies were harmed during the making of this post.
  13. Re:comcast business forces you to rent there hardw by Billly+Gates · · Score: 4, Interesting

    As a good techie /. nerd I always buy my own modems and routers. Comcast as much as I hate them do allow third party approved modems. I bought a Motorola surfboard. It is not Docsys 3.0 and I get concerned texts every now and then but it works fine so no reason to change.

    So even with an unapproved older modem it will still work. Maybe I can't download at 200 mb/s but at 100 mb/s it works fine.

  14. Re: comcast business forces you to rent there hard by Joe_Dragon · · Score: 2

    If you have static ip with comcast then just must rent.

    To bad the comcast cable tv sucks and they have that download cap on there internet.

  15. Re: comcast business forces you to rent there hard by Anonymous Coward · · Score: 1

    You can use any modem you want on Comcast and flash it with anything you desire. The list of "approved" modems basically makes it easier for the masses to get one that is "known to work", and removes the "what version of the DOCSIS standard does this one support" research from the process. At the end of the day you get a modem, you tell Comcast its MAC address, and then you're off to the races. Frequently Comcast doesn't even want their old modem back...

  16. Re: comcast business forces you to rent there hard by Anonymous Coward · · Score: 0

    But do they cap here internet?

  17. Actual test to verify? by jabberw0k · · Score: 4, Interesting

    Is there an actual test to run to verify whether or not a given device has these vulnerabilities? The listed ports do not seem to be open on the ones I was able to test.

    1. Re:Actual test to verify? by Anonymous Coward · · Score: 0

      "The listed ports do not seem to be open" - Yeah, I reconfigured the modem slightly and closed them. I don't want everyone else onto our modem now, it will ruin the bandwidth...

  18. Re:comcast business forces you to rent there hardw by TWX · · Score: 4, Interesting

    COX just broke DOCSIS below 3.0, had to change modems.

    I'd really wanted to use a DOCSIS HWIC module for my Cisco router, but COX specifically said that module would not be supported on their network, and then with the 3.0+ requirement, the 2.1-capable unit isn't supported anyway.

    Really wish that Google Fiber hadn't stalled. Theres a dark fiber trunk line running through the neighborhood around 200' from my house, and Google was in the habit of buying dark fiber wherever they could.

    --
    Do not look into laser with remaining eye.
  19. Upload custom firmware.... is an opportunity by Proudrooster · · Score: 1

    The ASUS Merlin project created custom firmware for ASUS routers, maybe this is a limited opportunity to create custom firmware for the AT&T modems that can increase security and add features.

  20. No kidding by Anonymous Coward · · Score: 0

    Does this actually surprise anyone? Really?

    This is why you should place the Uverse modem into the closest state you can get to bridgemode and disable the wifi. Then, put your own router/firewall/wifi access point behind it.

    1. Re:No kidding by Anonymous Coward · · Score: 0

      nice idea, but won't do a damn thing. you can't shut off the remote admin, which allows for a fucking firmware update from *anywhere*.

    2. Re: No kidding by Anonymous Coward · · Score: 0

      Why does the typical American tech solution always involve giving the turd a good polish?

    3. Re: No kidding by Anonymous Coward · · Score: 0

      Because of the loss of generational knowledge that happened during the immediate aftermath of the 2000 tech crash here

  21. Re: comcast business forces you to rent there hard by Anonymous Coward · · Score: 0

    We need to ban users on Slashdot who consistently make 3rd grade level spelling mistakes.

  22. Re:comcast business forces you to rent there hardw by Billly+Gates · · Score: 2

    They claimed they did and sent me scary texts and emails 6 months ago. My system still works and they left me alone. 2.1 is fully compatible and they won't disconnect your access.

  23. Pass on the freebie modems... by __aaclcg7560 · · Score: 1

    The freebie DSL modems that ATT provided weren't very good. Most would conk out after a year or two. When I started working one day a week from home, I bought a business class modem for $200 and spent several hours understanding the new security features. That one lasted seven years.

    1. Re:Pass on the freebie modems... by ls671 · · Score: 1

      I am sorry but I don't believe you. After all, you need at least an enterprise class modem to do the kind of work you do.

      --
      Everything I write is lies, read between the lines.
    2. Re:Pass on the freebie modems... by pnutjam · · Score: 1

      I used PfSense on an old computer and got all the enterprise features. later I bought an embedded x86 system.
      Unfortunately, Uverse At&T won't let you provide your own router, you can just put yours behind theirs, and it ain't a real pass through either.

  24. Responsible reporting... by Fly+Swatter · · Score: 1

    Is not giving out the actual login details, unless the offender has not fixed the problem in many months, not days. Even then it is rather inconsiderate to those that are stuck with the hardware. I have no respect for such 'researchers'.

    1. Re: Responsible reporting... by Anonymous Coward · · Score: 0

      In this case the security hole was added by the update, so warning people not to install it is not irresponsible.

    2. Re: Responsible reporting... by Anonymous Coward · · Score: 0

      Yeah but you can warn people not to install the update without giving out the credentials to the back door.

      I bet a lot of ppl saw the creds and headed off to shodan...

    3. Re: Responsible reporting... by Narcocide · · Score: 1

      One problem; ATT U-Verse staff updates the modems remotely, automatically, and without notice or recourse.

  25. How many reasons do you need by Anonymous Coward · · Score: 0

    for not buying American communication products or services? We could pile them up for you ad nauseum, and it seems some people will just never get it - they are made insecure by design.

    1. Re: How many reasons do you need by Anonymous Coward · · Score: 0

      Do you actually think this hardware / software is made in the USA ?

      Give you a guess where it IS made . .

  26. Re:Time to lay down the law! by Anonymous Coward · · Score: 0

    No this is NOT offtopic! You're offtopic! You're offtopic! This whole site is offtopic! We are in great danger, and we need to take action now! We either do this, or we all die! So, fuck you, moderators! You're a bunch of commie terrorist cunts!

  27. Re: comcast business forces you to rent there hard by Darinbob · · Score: 1

    Not true for AT&T. Your modems have to be able to talk to their modems, you can't buy a compatible one at Fry's. I'd buy my own if I could.

  28. I see what you're saying, but... by Anonymous Coward · · Score: 0

    I understand what you're saying, but in a way, that's still a kind of malevolence—it's basically a minor kind of fraud.

    1. Re:I see what you're saying, but... by Anonymous Coward · · Score: 0

      Sufficiently advanced cluelessness is indistinguishable from malice. That surely describes AT&T, and most other large phone/cable/ISP operations in the US. Small ISPs, up to perhaps the size of Sonic, seem to have a better handle on the tech as well as customer service, but they only have small service areas (kind of the definition of "small ISP"...) so most of us can't use them.

  29. Wonder if they pushed equiv onto android phones? by Ungrounded+Lightning · · Score: 1

    "It was found that the latest firmware update (9.2.2h0d83) for the NVG589 and NVG599 modems enabled SSH and contained hardcoded credentials which can be used to gain access to the modem's 'cshTell' client over SSH. ... [how to escalate this into full access ...]

    The latest update pushed to the modems opened this hole. Hmmm...

    AT&T just pushed a couple updates to my Android phone a few weeks back. Like a complete version jump on the Android OS, followed by a tweak update a week or two later.

    I wonder if they did the same sort of thing to the phones that they did to the U-Verse modems?

    --
    Bantam Dominique roosters crow a four-note song. Once you've heard it as "Happy BIRTHday" you can't NOT hear it that way
  30. Workaround fix by Anonymous Coward · · Score: 0

    FYI, I discovered some of these open ports using nmap on my Arris. You can block them even if you have the tainted firmware: Just set up manual port redirects in the modem for each one, and point them to some garbage internal address/port.

  31. Re: comcast business forces you to rent there hard by antdude · · Score: 1

    What about AT&T? Not all ISPs will let you. :P

    --
    Ant(Dude) @ Quality Foraged Links (AQFL.net) & The Ant Farm (antfarm.ma.cx / antfarm.home.dhs.org).
  32. Re: comcast business forces you to rent there har by Anonymous Coward · · Score: 0

    Yo moron we're not talking about Comcast, With ATT U-verse there are no options these are dual band DSL modems and you cannot buy your own anywhere that I can find. They have us by the balls and and are squeezing hard especially when they're the only ISP in town and have a monopoly which by the way should be criminal .

  33. Re: comcast business forces you to rent there hard by Spamalope · · Score: 1

    He means you must rent if you have a static IP. In my case they added a rental fee after the fact, told me I could buy a device then wouldn't activate it once I'd bought it.

  34. They're also slow AF by jsepeta · · Score: 1

    I can't believe AT&T are such cheap bastards that they're still shipping Wi-Fi 802.11g routers to their customers.

    --
    Remember kids, if you're not paying for the service, YOU ARE THE PRODUCT THAT IS BEING SOLD.
  35. Re: comcast business forces you to rent there hard by pnutjam · · Score: 1

    Not with Uverse, their IPtv won't work with your own equipment and there is no bridge mode. The best you an do is DMZ, or there is a router behind router option that puts in the necessary route for another subnet, theoretically, if never worked for me.

    God forbid you put in you own routes.
    The damn routers seem to forget the DMZ and port forwarding settings every 6 months or so, I'm not sure if AT&T was resetting things, or the hardware just sucked.
    Just had a client who's router forgot all the port forwarding I had configured.

  36. Re: comcast business forces you to rent there hard by pnutjam · · Score: 1

    I have a 1TB cap, which is sufficient with 4 kids using ipads to watch videos such.

  37. So, this is the birthplace of Unix. by Darkness+Of+Course · · Score: 1

    Funny how ATT never really came to grips with Unix. Beyond licensing and cash intake. They are just as clueless when it comes to user land equipment as anyone else. Even the hacks in China. One does wonder how many of their products have the same user/password combo.

    1. Re: So, this is the birthplace of Unix. by Anonymous Coward · · Score: 0

      No, that was a different entity called AT&T. This one used to be PacBell

  38. You mean the modem from the cable company? by Anonymous Coward · · Score: 0

    "Vulnerabilities" that benefit the provider for the selling of traffic information? No...... Why does this surprise people? You don't actually own the cable modem the company gives you. For several months now, your ISP has had the right to sell your browsing information to anyone but for some reason, people have completely forgotten about it.

  39. Re: comcast business forces you to rent there hard by Anonymous Coward · · Score: 0

    Nitpicking; with old-style DSL you could walk into Best Buy and get a Siemens modem that worked out of the box with AT&T. Which you then plugged into your own router. That's no longer the case with Uverse. You must rent their "gateway" which does have a Bridge Mode if you want to use your own router behind it. One would expect that Bridge Mode is not 100% that - AT&T certainly controls the firmware and can do things within the Bridge if they want to (or some agency with the right number of letters in their acronym asks then nicely). If you're using their whole box, then anybody who can spell "tech" understands that what you do from your side of the admin interface is always subject to revision by what AT&T does from theirs. So Not News unless these are new features being added. And what about old models like mine - where once I got on a different plan from the one they had me on (expensive) upon conversion from DSL I started having to pay rental for the box that's been up on top of the kitchen cabinets since Day One of Uverse.

  40. "inject advertisements"? !!!! by RhettLivingston · · Score: 1

    a kernel module whose sole purpose seems to be to inject advertisements into the user's unencrypted web traffic.

    Wow. That's a heck of a sleeper statement. I wonder whether Google already knew this?

    The ability to inject advertisements into HTTP traffic would be a minor tweak away from replacing advertisements that are already there. This could render the metrics from advertisement giants like Google worthless for HTTP traffic and become a large threat to their business model - even more so perhaps than ad blockers.

    I wonder if this is part of what is in Google's thoughts in their push for HTTPS. Perhaps it isn't about our security but theirs. Imagine if Comcast, Time Warner, AT&T, Verizon, and others started replacing the ads going to their users with ones they've sold. Any ads not flowing via HTTPS could be replaced. That would be a big, big hit.

    Interestingly, since the device closest to the user would win the battle, Google Wifi could be used to counter-attack such an effort, and I bet Google Home would be updated overnight to act as a mesh router. They might even start offering free Youtube Red or Google Play Music as an incentive to those using their mesh routing and enabling ad injection.

    1. Re:"inject advertisements"? !!!! by Narcocide · · Score: 1

      Yea, even better, when you try to look up a hostname and get no DNS response, the router forwards your HTTP request directly to itself. (this causes some very interesting conflicts with Slashdot's annoying auto-refresh redirects)

  41. Re:comcast business forces you to rent there hardw by TWX · · Score: 1

    Service kept dropping out. Didn't have to pay for my modem anyway since we have the home telephone line, so they supplied the model with the VOIP capability.

    --
    Do not look into laser with remaining eye.
  42. Dont Buy A Puma 6 Modem by Anonymous Coward · · Score: 0

    I purchased an upscale Cable Modem with Gig Ethernet ports and wireless 802.11 AC only to find out that it fails when sent a stream of UDP packets. My son noticed the performance drop immediately while playing Steam.

    Here is a test to see if your modem contains the infamous Intel Puma 6 Chipset.

  43. Re: comcast business forces you to rent there hard by Anonymous Coward · · Score: 0

    Yeah, but that's neither hear nor they're.

  44. Wahr about Pace Pic Modem/Routers? by Anonymous Coward · · Score: 0

    Pace Pic is the current supplier and replaced tu faulty Arris unit I had. What holes are in this unit? I suspect even more...........

  45. HAH by bobmajdakjr · · Score: 1

    i had both of these! and they both eventually died lololololol. horray for that.

  46. Re:comcast business forces you to rent there hardw by Anonymous Coward · · Score: 0

    I have Comcast business service. I am using their Cisco BWG hardware... and it is connected only to my firewall/router which isolates my systems from Comcast's network.

    I am required to use their equipment to connect to their network, but I do not have to give them uncontrolled access to my network.