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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
      • Report Tweet
      • Report NetzDG Violation
      Replying to @musalbas

      BENIGNCERTAIN has three steps for operating it. Step 1: run bc-genpkt to generate a packet to send to a Cisco VPN.pic.twitter.com/ii91qExzVI

      1 reply 26 retweets 22 likes
    2. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
      • Report Tweet
      • Report NetzDG Violation
      Replying to @musalbas

      Step 2: run bc-id to send the packet to a Cisco VPN target.pic.twitter.com/fGWvlRWLpf

      1 reply 23 retweets 17 likes
    3. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
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      Replying to @musalbas

      Step 3: run bc-parser to parse the response from the Cisco VPN.pic.twitter.com/XPiYiI8f8E

      1 reply 24 retweets 19 likes
    4. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
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      Replying to @musalbas

      bc-parser appears to be able to extract RSA private keys and other VPN configuration from the response.

      1 reply 20 retweets 19 likes
    5. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
      • Report Tweet
      • Report NetzDG Violation
      Replying to @musalbas

      This means NSA's tool may be able to extract Cisco VPN private keys by remotely sending a packet to it. That's huge.pic.twitter.com/uGnjNVKYYh

      10 replies 433 retweets 309 likes
    6. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
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      Replying to @musalbas

      Again though: someone who has a Cisco firewall should investigate more to verify if this is the case and understand the exact implications.

      2 replies 6 retweets 10 likes
    7. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
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      Replying to @musalbas

      Does anyone have a Cisco PIX firewall with a VPN configured for me to test on?

      8 replies 12 retweets 10 likes
    8. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
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      Replying to @musalbas

      Not sure what payload does exactly, it looks like it may be a Heartbleed/overflow-type vulnerability to dump memory.pic.twitter.com/sO8T7SRVSb

      3 replies 20 retweets 12 likes
    9. Hector Martin‏ @marcan42 18 Aug 2016
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      Replying to @musalbas

      I was going to say, it sounds like a Heartbleed style buffer overread or other arbitrary read vuln.

      1 reply 1 retweet 0 likes
    10. Hector Martin‏ @marcan42 18 Aug 2016
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      Replying to @marcan42 @musalbas

      Looks like it sends IKE packets with a very large Group-Prime option. If the Cisco is replying using the request length (1/2)

      1 reply 12 retweets 21 likes
      Hector Martin‏ @marcan42 18 Aug 2016
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      Replying to @marcan42 @musalbas

      ... but only filling in the requested 768 bit prime, then you've got yourself a buffer of uninitialized crap following it (2/2)

      11:50 AM - 18 Aug 2016
      • 12 Retweets
      • 23 Likes
      • Will Strafach Thireus ☠ Master SFPN Mako René Mayrhofer Martin Millnert Curt Wilson, human Vigilox Kia‏☆
      2 replies 12 retweets 23 likes
        1. New conversation
        1. Mustafa Al-Bassam‏ @musalbas 18 Aug 2016
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          Replying to @marcan42

          It appears to patch memory?pic.twitter.com/JsnhmTEkUW

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 18 Aug 2016
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          Replying to @musalbas

          No xrefs, looks like dead code. ELIGIBLEBACHELOR also has it and actually uses it. utils.h style function?

          0 replies 0 retweets 2 likes
          3. End of conversation
        1. Maksym Zaitsev‏ @cryptolok 18 Aug 2016
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          Replying to @marcan42 @matthew_d_green @musalbas

          So that's where the malloc comes in place...pic.twitter.com/HFmnqhVBtN

          0 replies 1 retweet 2 likes
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