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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. Hector Martin‏ @marcan42 15 Oct 2019
      • Report Tweet
      • Report NetzDG Violation

      Can we please stop talking about that sudo bug? It only affects systems using an insane configuration (allow $command as anyone *but* root). I can't come up with any situation where that configuration makes any sense (vs e.g. "allow $command as any member of a given group).

      12 replies 195 retweets 560 likes
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    2. m1m‏ @m1matas 15 Oct 2019
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      Replying to @marcan42 @travisgoodspeed

      The only scenario I could come up with is one in which a group of users were granted the ability to impersonate a service account (eg www-data), rather than root, to administer that service. This vuln would let users in that group be root.

      0 replies 0 retweets 1 like
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    4. Hector Martin‏ @marcan42 16 Oct 2019
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      Replying to @m1matas @travisgoodspeed

      No, this doesn't work. To rephrase: the bug is that if you allow users to sudo as user '-1', that unexpectedly means root. If you allow users to sudo as www-data or whatever, that isn't -1, and so they can't become root.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 16 Oct 2019
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      Replying to @marcan42 @m1matas @travisgoodspeed

      For example: testuser ALL=(nobody) /usr/bin/id testuser@curious$ sudo -u nobody id uid=65534(nobody) gid=65534(nobody) groups=65534(nobody) testuser@curious$ sudo -u '#-1' id Sorry, user testuser is not allowed to execute '/usr/bin/id' as #-1 on curious.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 16 Oct 2019
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      Replying to @marcan42 @m1matas @travisgoodspeed

      To trigger the bug you have to do this: testuser ALL=(ALL, !root) /usr/bin/id And then: testuser@$ sudo -u root id Sorry, user testuser is not allowed to execute '/usr/bin/id' as root on curious. testuser@$ sudo -u '#-1' id uid=0(root) gid=1002(testuser) groups=1002(testuser)

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 16 Oct 2019
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      Replying to @marcan42 @m1matas @travisgoodspeed

      But that config means you allow testuser to sudo as *literally any and all users except root*. That is not least privilege, that is "most privilege except for root", which is a stupid idea.

      12:23 AM - 16 Oct 2019
      • 1 Retweet
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      • INVEST IN SAFETY = DEFUND THE POLICE Ox313034313532313431313731303135303132 Pirmin Schmid Ed Greg Neumarke Tim Dirk Zandkamp Michael Gissing
      0 replies 1 retweet 9 likes

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