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tehjh's profile
Jann Horn
Jann Horn
Jann Horn
@tehjh

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Jann Horn

@tehjh

works at Google Project Zero. personal account.

Joined August 2011

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    1. Matthew Garrett‏ @mjg59 27 Mar 2019
      • Report Tweet
      • Report NetzDG Violation

      It's been over 90 days since I reported it and @TPLINK never responded, so: arbitrary command execution on the TP-Link SR20 smart hub and router (and possibly other TP-Link device)

      17 replies 516 retweets 900 likes
      Show this thread
    2. Matthew Garrett‏ @mjg59 27 Mar 2019
      • Report Tweet
      • Report NetzDG Violation

      TP-Link routers frequently run a process called "tddp" (TP-Link Device Debug Protocol) as root. It's had multiple vulnerabilities in the past and the protocol is fairly well documented. Version 1 has no auth, version 2 requires the admin password.

      1 reply 10 retweets 84 likes
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    3. Matthew Garrett‏ @mjg59 27 Mar 2019
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      • Report NetzDG Violation

      The SR20 still exposes some version 1 commands, one of which (command 0x1f, request 0x01) appears to be for some sort of configuration validation. You send it a filename, a semicolon and then an argument.

      3 replies 4 retweets 59 likes
      Show this thread
    4. Matthew Garrett‏ @mjg59 27 Mar 2019
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      • Report NetzDG Violation

      The router then connects back to the requesting machine over TFTP, requests the filename via TFTP, imports it into a LUA interpreter and passes the argument to the config_test() function in the file it just imported. The interpreter is running as root.

      1 reply 9 retweets 82 likes
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    5. Matthew Garrett‏ @mjg59 27 Mar 2019
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      • Report NetzDG Violation

      The os.execute() method allows you to execute whatever you want, and you're running as root, so victory. tddp is listening on all interfaces but the default firewall rules block WAN access, so this is local network only.

      2 replies 4 retweets 69 likes
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    6. Matthew Garrett‏ @mjg59 27 Mar 2019
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      Anyway, stop shipping debug daemons on production firmware and if you're going to have a webform to submit security issues then have someone actually respond to it.

      1 reply 21 retweets 165 likes
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    7. Matthew Garrett‏ @mjg59 27 Mar 2019
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      PoC athttps://pastebin.com/GAzccR95 

      5 replies 27 retweets 168 likes
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    8. Matthew Garrett‏ @mjg59 27 Mar 2019
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      (Successfully tested this using qemu-user-arm to run tddp on my laptop, which makes debugging stuff a *lot* easier)

      3 replies 2 retweets 90 likes
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      Jann Horn‏ @tehjh 27 Mar 2019
      • Report Tweet
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      Replying to @mjg59

      that seems like a good way to accidentally wipe your harddisk

      9:10 PM - 27 Mar 2019
      1 reply 0 retweets 0 likes
        1. Matthew Garrett‏ @mjg59 27 Mar 2019
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          • Report NetzDG Violation
          Replying to @tehjh

          Most fun I've had there is when something reset my clock to the epoch

          0 replies 0 retweets 3 likes
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