Sudo: CVE-2019-14287 – Fascinating reminder that security is hard

https://www.openwall.com/lists/oss-security/2019/10/14/1

by stevekemp • 7 years ago

14 4 7 years ago

sir_eliah• 7 years ago

Very interesting! I'm just reading the commit that fixes this to understand what exactly went wrong. https://www.sudo.ws/repos/sudo/rev/83db8dba09e7

NKosmatos• 7 years ago

This is not good... Haven't tried it yet, but it's a big security hole in "sudo". Patch up your Linux systems now!

tidus1• 7 years ago

tried it on my centos and ubuntu systems... doesn't work

alethiophile• 7 years ago

It only works if you've got a specific, somewhat unlikely configuration. You need to have ALL in the user specifier, but not root (or else it's not a vuln, just a bug). So

username ALL=(ALL, !root) ALL

would be vulnerable; this is trying to let username run commands as any other user _except_ root, but using this vuln the user can get around it.

You can duplicate it by running (as a user with sudo ALL privileges) `sudo -u#-1 id`; it'll show 0, for root.

Sudo: CVE-2019-14287 – Fascinating reminder that security is hard

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