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CVE-2019-18684

Published: 4 November 2019

** DISPUTED ** Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write "ALL ALL=(ALL) NOPASSWD:ALL" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers.

Notes

AuthorNote
mdeslaur
this isn't an issue and was rejected by upstream
Priority

Low

CVSS 3 base score: 7.0

Status

Package Release Status
sudo
Launchpad, Ubuntu, Debian
bionic Not vulnerable

disco Not vulnerable

eoan Not vulnerable

precise Not vulnerable

trusty Not vulnerable

upstream Needs triage

xenial Not vulnerable