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GHSA-w9q3-g4p5-5q2r
No affected components available
Summary
Users with limited sudo privileges (e.g. execution of a single command) can list sudo privileges of other users using the -U flag. This doesn't happen with the original sudo.
PoC
The initial test has been done in a container running Ubuntu 24.04 and installing oxidizr, running sudo-rs 0.2.2.
A user (bob) has been added with only ps command executable through sudo:
root ALL=(ALL:ALL) ALL
bob ALL=(ALL:ALL) /usr/bin/ps
The user is not able to read the /etc/sudoers file and running sudo -l -Uroot with original sudo (version 1.9.15p5) causes the following error:
Sorry, user bob is not allowed to execute 'list' as root on 43d4aed3cdbd.
The same command with sudo-rs is run without denying the execution:
User root may run the following commands on 43d4aed3cdbd:
(ALL : ALL) ALL
The same happens for other non-root users:
bob@43d4aed3cdbd:~$ sudo -l -Ufoo
User foo may run the following commands on 43d4aed3cdbd:
(ALL : ALL) /usr/bin/whoami
The behavior has been also been observed for version 0.2.5.
Impact
Users with limited sudo privileges can enumerate the sudoers file, revealing sensitive information about other users' permissions. Attackers can collect information that can be used to more targeted attacks.
Systems where users either do not have sudo privileges or have the ability to run all commands as root through sudo (the default configuration on most systems) are not affected by this advisory.
Credits
This issue was identified by Sonia Zorba.
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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