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posted by martyb on Wednesday June 09, @05:53AM   Printer-friendly
from the wireless-infidelity dept.

New Vulnerabilities in Wi-Fi Security Revealed:

[Mathy] Vanhoef, who is affiliated with KU Leuven and New York University Abu Dhabi, found three vulnerabilities in the Wi-Fi security protocol. He also identified several programming errors in devices with Wi-Fi connections. For the study, he tested 75 devices, including smartphones, laptops, and smart devices. All devices that were tested were vulnerable to at least one of the discovered flaws.

The weaknesses found in the Wi-Fi security protocols are very difficult to exploit, which may explain why they remained under the radar for a long time: Vanhoef found them in the current WPA3 protocol, but also in all previous security protocols, dating back to 1997.

[...] The programming errors that Vanhoef found in Wi-Fi devices are especially problematic for smart appliances and computers that have not been updated in a long time because it is easier to abuse them in these cases.

[...] There is no immediate cause for concern. “It’s impossible to tell if these flaws have already been abused. It seems rather unlikely because they went unnoticed for so long.” Over the past nine months, Vanhoef worked closely with many major IT companies, including Google and Microsoft, to fix the weaknesses. This happened via the Wi-Fi Alliance, an association of IT companies that jointly own and control the Wi-Fi trademark. Yesterday, they launched the necessary updates to fix the flaws.

[...] Visit fragattacks.com for more information about the discovered weaknesses.

He has created a website fragattacks.com which goes into considerable detail outlining the various flaws that were discovered. There are also links to tools that he has made available including a bootable live image. There is also a 6m30s video demonstration available on YouTube.


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  • (Score: 2) by maxwell demon on Thursday June 10, @09:16AM (4 children)

    by maxwell demon (1608) on Thursday June 10, @09:16AM (#1143838) Journal

    Of course the whole point of airplane mode is the device not emitting radiation (which might interfere with airplane electronics). Passive scanning doesn't emit radiation, therefore there's no need to switch it off in airplane mode. And if passive scanning is done, it means that as soon as you go out of airplane mode, you'll immediately have a list of networks to connect to, without the need of waiting or actively sending out requests. Thus doing it makes sense outside of conspiracies.

    Now if you switch your phone off and it still scans for networks, that is when you should get suspicious.

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  • (Score: 0) by Anonymous Coward on Thursday June 10, @10:39AM

    by Anonymous Coward on Thursday June 10, @10:39AM (#1143843)

    I am afraid the GP has a little knowledge and filled in some of the rest with paranoia. The WiFi and other scanning is for WiPS, TTFF, and a myriad of other reasons that people who deal with this stuff should already know about. I could go on about other inaccuracies too, but I'll leave it there for brevity's sake.

  • (Score: 2) by TheGratefulNet on Thursday June 10, @01:32PM (2 children)

    by TheGratefulNet (659) on Thursday June 10, @01:32PM (#1143872)

    I'm not convinced about this.

    turning off the radio for wifi, entirely, does save power. not having to service any interrupts saves cpu.

    I dont believe that ssid scanning or any reception AT ALL happens when you turn on airplane mode.

    prove it. no handwaving, please. show specs or code (code, preferably).

    I am in the car industry and have worked on car gateways, which use all the rf types (wifi, lte, gps, ble) and when we told our radio to turn off lte or wifi, it truly did and if I tried doing an ssid scan, nothing would work since the subsystem was actually shut down. this was with ublox hardware, which is a major player in the field and I assume other vendors are similar.

    even linux; turn off your radio and try doing an ssid scan. it wont work. turning off radio REALLY DOES turn off the radio. you can see it with a current meter on the dc rails, as well.

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    • (Score: 2) by TheGratefulNet on Thursday June 10, @01:35PM

      by TheGratefulNet (659) on Thursday June 10, @01:35PM (#1143873)

      oh, and the reason I know all this is because, with cars, there's a major push to save battery power (vampire drain as its often called).

      you are agressive in how you put devices into sleep or lower power mode. if you CAN turn off wifi, you do it. if you CAN turn off some ethernet or CAN, you do it. every bit helps. a lot of car stuff these days is about how to get into and out of lower power modes, reliably (with networking and mixed os's, its actually quite hard).

      so, we constantly watched current drain as we updated our code, drivers and sleep strat.

      believe me, we dont spend time scanning for ssid if the radio is DOWN. talking to a dead person gives no replies and is a waste of time ;)

      --
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    • (Score: 2) by RamiK on Thursday June 10, @04:25PM

      by RamiK (1813) on Thursday June 10, @04:25PM (#1143924)

      I dont believe that ssid scanning or any reception AT ALL happens when you turn on airplane mode.

      Read up on TSG22_R3_USE_12 (p.30): https://www.gsma.com/newsroom/wp-content/uploads/TS.22_v5.0.pdf [gsma.com]

      So the wifi is on even in airplane mode and Passpoint authentication is performed automatically using the U/SIM credentials - thus identifying the phone and opening it up for any backdoors.

      For the mobile part there's only circumstantial evidences. e.g. The SIM7000 simcom doc (p.51) [simcom.ee] specifies 3 modes: Minimum functionality, Full functionality and Flight mode with their associate separate AT serial codes. So, there's clearly a physical distinction between turning it off and entering flight mode. And that's an arduino shield module rather than a full baseband so it doesn't even have the excuse of having to keep running...

      Regardless, just open up an old smartphone and multimeter the antenna against the common ground between modes and you'll see it doesn't power off.

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