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    0-day Backdoor Allow Hackers to Gain Remote Root Shell Access on Teradek IP Video Devices

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    New 0-day Backdoor Allow Hackers to Gain Remote Root Shell Access on Teradek IP Video Devices

    A brand new report has been printed lately which claims {that a} 0-day backdoor giving distant root shell entry on Teradek IP video gadgets. 

    The Teradek IP video devices are stay streaming gadgets, that typically encode video inputs to totally different streaming codecs which might be fairly competent in Ethernet transport.

    In accordance with the report, there are a number of IP video gadgets which were made by Teradek. Nevertheless, the consultants have studied the gadget fastidiously and said that the gadget has an Ethernet interface and it additionally has a Net administration interface that’s obtainable at HTTP://<device_ip> by default. 

    And a very powerful level is that the Net administration interface is preserved by a user-defined password.

    Reversing The Firmware and Key Calculation

    The pictures for firmware can be found for downloads on the website of the producer. However the pictures which might be current are unencrypted, unprotected Squashfs information may be eliminated simply utilizing squashfs-tools.

    Nevertheless, this firmware for the VidiU Go gadget is mounted on the ARM64 Linux kernel. And the safety analysts have examined model 3.1.12 (in 2020), nonetheless, probably the most superior 3.1.13 is exactly the identical within the look of this report.

    Other than all this, probably the most fascinating perform is to research, and apparently, it’s conceivable to seek out extra vulnerabilities. Nevertheless, it most likely concentrates on the backdoor entry perform encountered in /residence/www/cgi-bin/check.cgi.

    On the opposite aspect reversing the crypto features implies that the important thing calculation that we have now given beneath:-

    td_license_create(“tdtest”, 0, 0) = SHA1(SHA512(“0x5f3759df<MAC_ADDRESS_OF_DEVICE>tdtest”))

    The calculation implies that every little thing is required for the important thing calculation is usually hardcoded within the generic firmware. Whereas right here solely the MAC handle half depends on the gadget.

    Root Credentials

    Nevertheless, within the case of root credentials, the Telnet is allowed for connection, and this provides a login immediate. In case of the credentials, lookup /and so forth/shadow within the firmware picture:-

    root:HjMedVB3oPf0o:11851:0:99999:7:::

    Nicely, the report claimed that it’s a conventional weak Unix crypt() DES hash, and it’s 100% crackable in a really quick (~3 days) time-frame. Not solely this however as soon as it will get cracked the password turns into very weak.

    Affected firmware

    The firmware that’s being attacked on this 0-day backdoor are talked about beneath:-

    • Teradek VidiU Go 3.1.12 (launched on 08–06-2020)
    • Teradek VidiU Go 3.1.13 (launched on 05–10–2021, newest on the time of writing)
    • Teradek firmware for different gadgets (noticed the identical code with the identical hardcoded hashes in different firmware, however testing is required).

    Mitigation

    Until now the safety researchers are attempting their greatest to discover a correct patch for this assault, nonetheless, they haven’t but discovered a correct repair. 

    However, until now there isn’t any correct option to disable the backdoor and/or change hardcoded keys/passwords, that’s why there is just one option to mitigate is so as to add an additional layer of safety to the online interface, because it restricts entry to the online interface.

    Even the safety consultants additionally affirmed that they need to check out the mitigation, as it’ll assist them to maintain themself protected from this sort of backdoor.

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