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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
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      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. Hector Martin‏ @marcan42 15 Oct 2019
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      I wouldn't be surprised if the number of systems affected by the vuln that *aren't* already intrinsically vulnerable to nasty privescs because the configuration is a terrible idea when working as intended is, well, essentially 0.

      3 replies 5 retweets 57 likes
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    3. Hector Martin‏ @marcan42 15 Oct 2019
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      Since people still don't understand the vulnerable config: you have to allow $someone to sudo into *ANY USER* (not one specifically, *ANY*), which means giving them root, and then add an *exception* to take root away (but still let them become *any* other user).

      3 replies 17 retweets 64 likes
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    4. m1m‏ @m1matas 15 Oct 2019
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      Replying to @marcan42

      I was able to get this to work when my sudoers only permitted a user to sudo to www-data. I didn’t need to permit ALL... unless I’m remembering incorrectly.

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

      I bet your sudoers entry didn't do what you think it did, or there was another sudoers entry overriding. It definitely does not work for me.

      2:11 AM - 16 Oct 2019
      1 reply 0 retweets 0 likes
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        2. m1m‏ @m1matas 16 Oct 2019
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          Replying to @marcan42

          It’s entirely possible. I don’t use sudoers much. What I thought I did was: testuser ALL=(www-data) ALL I could sudo -u#-1 cat /etc/shadow and it worked. It’s possible I had (ALL, www-data), which would be silly but It didn’t have my full attn. I’ll check it again.

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

          Make sure testuser really is a normal user and isn't in e.g. any groups that grant it general sudo privileges.

          1 reply 0 retweets 0 likes
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