CVE-2023-42456 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2023-42456 Interim 1 14 2026-03-05T03:36:50Z current 2023-12-06T00:09:34Z 2026-03-05T03:36:50Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2023-42456 Sudo-rs, a memory safe implementation of sudo and su, allows users to not have to enter authentication at every sudo attempt, but instead only requiring authentication every once in a while in every terminal or process group. Only once a configurable timeout has passed will the user have to re-authenticate themselves. Supporting this functionality is a set of session files (timestamps) for each user, stored in `/var/run/sudo-rs/ts`. These files are named according to the username from which the sudo attempt is made (the origin user). An issue was discovered in versions prior to 0.2.1 where usernames containing the `.` and `/` characters could result in the corruption of specific files on the filesystem. As usernames are generally not limited by the characters they can contain, a username appearing to be a relative path can be constructed. For example we could add a user to the system containing the username `../../../../bin/cp`. When logged in as a user with that name, that user could run `sudo -K` to clear their session record file. The session code then constructs the path to the session file by concatenating the username to the session file storage directory, resulting in a resolved path of `/bin/cp`. The code then clears that file, resulting in the `cp` binary effectively being removed from the system. An attacker needs to be able to login as a user with a constructed username. Given that such a username is unlikely to exist on an existing system, they will also need to be able to create the users with the constructed usernames. The issue is patched in version 0.2.1 of sudo-rs. Sudo-rs now uses the uid for the user instead of their username for determining the filename. Note that an upgrade to this version will result in existing session files being ignored and users will be forced to re-authenticate. It also fully eliminates any possibility of path traversal, given that uids are always integer values. The `sudo -K` and `sudo -k` commands can run, even if a user has no sudo access. As a workaround, make sure that one's system does not contain any users with a specially crafted username. While this is the case and while untrusted users do not have the ability to create arbitrary users on the system, one should not be able to exploit this issue. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://www.suse.com/support/security/rating/ SUSE Security Ratings SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Server 15 SP6-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Server for SAP Applications 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Micro 6.0 SUSE Linux Micro 6.1 openSUSE Leap 15.6 openSUSE Tumbleweed sudo sudo-1.9.15p2-1.1 sudo-1.9.15p5-1.3 sudo-1.9.15p5-150600.1.2 sudo-1.9.15p5-150600.3.6.2 sudo-1.9.15p5-slfo.1.1_1.2 sudo-1.9.17p1-160000.2.2 sudo-devel sudo-devel-1.9.15p2-1.1 sudo-devel-1.9.15p5-150600.1.2 sudo-devel-1.9.15p5-150600.3.6.2 sudo-devel-1.9.17p1-160000.2.2 sudo-plugin-python sudo-plugin-python-1.9.15p2-1.1 sudo-plugin-python-1.9.15p5-150600.1.2 sudo-plugin-python-1.9.15p5-150600.3.6.2 sudo-plugin-python-1.9.17p1-160000.2.2 sudo-policy-sudo-auth-self sudo-policy-sudo-auth-self-1.9.15p2-1.1 sudo-policy-sudo-auth-self-1.9.15p5-150600.1.2 sudo-policy-sudo-auth-self-1.9.15p5-150600.3.6.2 sudo-policy-sudo-auth-self-1.9.17p1-160000.2.2 sudo-policy-wheel-auth-self sudo-policy-wheel-auth-self-1.9.15p2-1.1 sudo-policy-wheel-auth-self-1.9.15p5-150600.1.2 sudo-policy-wheel-auth-self-1.9.15p5-150600.3.6.2 sudo-policy-wheel-auth-self-1.9.17p1-160000.2.2 sudo-test sudo-test-1.9.15p2-1.1 system-group-sudo system-group-sudo-1.9.15p2-1.1 system-group-sudo-1.9.15p5-150600.1.2 system-group-sudo-1.9.15p5-150600.3.6.2 system-group-sudo-1.9.17p1-160000.2.2 sudo-1.9.15p5-150600.1.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-devel-1.9.15p5-150600.1.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-plugin-python-1.9.15p5-150600.1.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-policy-sudo-auth-self-1.9.15p5-150600.1.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-policy-wheel-auth-self-1.9.15p5-150600.1.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 system-group-sudo-1.9.15p5-150600.1.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-1.9.15p5-150600.3.6.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 sudo-devel-1.9.15p5-150600.3.6.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 sudo-plugin-python-1.9.15p5-150600.3.6.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 sudo-policy-sudo-auth-self-1.9.15p5-150600.3.6.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 sudo-policy-wheel-auth-self-1.9.15p5-150600.3.6.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 system-group-sudo-1.9.15p5-150600.3.6.2 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 sudo-1.9.17p1-160000.2.2 as a component of SUSE Linux Enterprise Server 16.0 sudo-devel-1.9.17p1-160000.2.2 as a component of SUSE Linux Enterprise Server 16.0 sudo-plugin-python-1.9.17p1-160000.2.2 as a component of SUSE Linux Enterprise Server 16.0 sudo-policy-sudo-auth-self-1.9.17p1-160000.2.2 as a component of SUSE Linux Enterprise Server 16.0 sudo-policy-wheel-auth-self-1.9.17p1-160000.2.2 as a component of SUSE Linux Enterprise Server 16.0 system-group-sudo-1.9.17p1-160000.2.2 as a component of SUSE Linux Enterprise Server 16.0 sudo-1.9.15p5-1.3 as a component of SUSE Linux Micro 6.0 sudo-1.9.15p5-slfo.1.1_1.2 as a component of SUSE Linux Micro 6.1 sudo-1.9.15p2-1.1 as a component of openSUSE Tumbleweed sudo-devel-1.9.15p2-1.1 as a component of openSUSE Tumbleweed sudo-plugin-python-1.9.15p2-1.1 as a component of openSUSE Tumbleweed sudo-policy-sudo-auth-self-1.9.15p2-1.1 as a component of openSUSE Tumbleweed sudo-policy-wheel-auth-self-1.9.15p2-1.1 as a component of openSUSE Tumbleweed sudo-test-1.9.15p2-1.1 as a component of openSUSE Tumbleweed system-group-sudo-1.9.15p2-1.1 as a component of openSUSE Tumbleweed sudo as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-devel as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-plugin-python as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-policy-sudo-auth-self as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo-policy-wheel-auth-self as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 system-group-sudo as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 sudo as a component of SUSE Linux Enterprise Server 15 SP6-LTSS sudo-devel as a component of SUSE Linux Enterprise Server 15 SP6-LTSS sudo-plugin-python as a component of SUSE Linux Enterprise Server 15 SP6-LTSS sudo-policy-sudo-auth-self as a component of SUSE Linux Enterprise Server 15 SP6-LTSS sudo-policy-wheel-auth-self as a component of SUSE Linux Enterprise Server 15 SP6-LTSS system-group-sudo as a component of SUSE Linux Enterprise Server 15 SP6-LTSS sudo as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 sudo-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 sudo-plugin-python as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 sudo-policy-sudo-auth-self as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 sudo-policy-wheel-auth-self as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 system-group-sudo as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 sudo as a component of openSUSE Leap 15.6 sudo-devel as a component of openSUSE Leap 15.6 sudo-plugin-python as a component of openSUSE Leap 15.6 sudo-policy-sudo-auth-self as a component of openSUSE Leap 15.6 sudo-policy-wheel-auth-self as a component of openSUSE Leap 15.6 sudo-test as a component of openSUSE Leap 15.6 system-group-sudo as a component of openSUSE Leap 15.6 Sudo-rs, a memory safe implementation of sudo and su, allows users to not have to enter authentication at every sudo attempt, but instead only requiring authentication every once in a while in every terminal or process group. Only once a configurable timeout has passed will the user have to re-authenticate themselves. Supporting this functionality is a set of session files (timestamps) for each user, stored in `/var/run/sudo-rs/ts`. These files are named according to the username from which the sudo attempt is made (the origin user). An issue was discovered in versions prior to 0.2.1 where usernames containing the `.` and `/` characters could result in the corruption of specific files on the filesystem. As usernames are generally not limited by the characters they can contain, a username appearing to be a relative path can be constructed. For example we could add a user to the system containing the username `../../../../bin/cp`. When logged in as a user with that name, that user could run `sudo -K` to clear their session record file. The session code then constructs the path to the session file by concatenating the username to the session file storage directory, resulting in a resolved path of `/bin/cp`. The code then clears that file, resulting in the `cp` binary effectively being removed from the system. An attacker needs to be able to login as a user with a constructed username. Given that such a username is unlikely to exist on an existing system, they will also need to be able to create the users with the constructed usernames. The issue is patched in version 0.2.1 of sudo-rs. Sudo-rs now uses the uid for the user instead of their username for determining the filename. Note that an upgrade to this version will result in existing session files being ignored and users will be forced to re-authenticate. It also fully eliminates any possibility of path traversal, given that uids are always integer values. The `sudo -K` and `sudo -k` commands can run, even if a user has no sudo access. As a workaround, make sure that one's system does not contain any users with a specially crafted username. While this is the case and while untrusted users do not have the ability to create arbitrary users on the system, one should not be able to exploit this issue. CVE-2023-42456 SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-1.9.15p5-150600.1.2 SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-devel-1.9.15p5-150600.1.2 SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-plugin-python-1.9.15p5-150600.1.2 SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-policy-sudo-auth-self-1.9.15p5-150600.1.2 SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-policy-wheel-auth-self-1.9.15p5-150600.1.2 SUSE Linux Enterprise Module for Basesystem 15 SP6:system-group-sudo-1.9.15p5-150600.1.2 SUSE Linux Enterprise Module for Basesystem 15 SP7:sudo-1.9.15p5-150600.3.6.2 SUSE Linux Enterprise Module for Basesystem 15 SP7:sudo-devel-1.9.15p5-150600.3.6.2 SUSE Linux Enterprise Module for Basesystem 15 SP7:sudo-plugin-python-1.9.15p5-150600.3.6.2 SUSE Linux Enterprise Module for Basesystem 15 SP7:sudo-policy-sudo-auth-self-1.9.15p5-150600.3.6.2 SUSE Linux Enterprise Module for Basesystem 15 SP7:sudo-policy-wheel-auth-self-1.9.15p5-150600.3.6.2 SUSE Linux Enterprise Module for Basesystem 15 SP7:system-group-sudo-1.9.15p5-150600.3.6.2 SUSE Linux Enterprise Server 16.0:sudo-1.9.17p1-160000.2.2 SUSE Linux Enterprise Server 16.0:sudo-devel-1.9.17p1-160000.2.2 SUSE Linux Enterprise Server 16.0:sudo-plugin-python-1.9.17p1-160000.2.2 SUSE Linux Enterprise Server 16.0:sudo-policy-sudo-auth-self-1.9.17p1-160000.2.2 SUSE Linux Enterprise Server 16.0:sudo-policy-wheel-auth-self-1.9.17p1-160000.2.2 SUSE Linux Enterprise Server 16.0:system-group-sudo-1.9.17p1-160000.2.2 SUSE Linux Micro 6.0:sudo-1.9.15p5-1.3 SUSE Linux Micro 6.1:sudo-1.9.15p5-slfo.1.1_1.2 openSUSE Tumbleweed:sudo-1.9.15p2-1.1 openSUSE Tumbleweed:sudo-devel-1.9.15p2-1.1 openSUSE Tumbleweed:sudo-plugin-python-1.9.15p2-1.1 openSUSE Tumbleweed:sudo-policy-sudo-auth-self-1.9.15p2-1.1 openSUSE Tumbleweed:sudo-policy-wheel-auth-self-1.9.15p2-1.1 openSUSE Tumbleweed:sudo-test-1.9.15p2-1.1 openSUSE Tumbleweed:system-group-sudo-1.9.15p2-1.1 SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-devel SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-plugin-python SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-policy-sudo-auth-self SUSE Linux Enterprise Module for Basesystem 15 SP6:sudo-policy-wheel-auth-self SUSE Linux Enterprise Module for Basesystem 15 SP6:system-group-sudo SUSE Linux Enterprise Server 15 SP6-LTSS:sudo SUSE Linux Enterprise Server 15 SP6-LTSS:sudo-devel SUSE Linux Enterprise Server 15 SP6-LTSS:sudo-plugin-python SUSE Linux Enterprise Server 15 SP6-LTSS:sudo-policy-sudo-auth-self SUSE Linux Enterprise Server 15 SP6-LTSS:sudo-policy-wheel-auth-self SUSE Linux Enterprise Server 15 SP6-LTSS:system-group-sudo SUSE Linux Enterprise Server for SAP Applications 15 SP6:sudo SUSE Linux Enterprise Server for SAP Applications 15 SP6:sudo-devel SUSE Linux Enterprise Server for SAP Applications 15 SP6:sudo-plugin-python SUSE Linux Enterprise Server for SAP Applications 15 SP6:sudo-policy-sudo-auth-self SUSE Linux Enterprise Server for SAP Applications 15 SP6:sudo-policy-wheel-auth-self SUSE Linux Enterprise Server for SAP Applications 15 SP6:system-group-sudo openSUSE Leap 15.6:sudo openSUSE Leap 15.6:sudo-devel openSUSE Leap 15.6:sudo-plugin-python openSUSE Leap 15.6:sudo-policy-sudo-auth-self openSUSE Leap 15.6:sudo-policy-wheel-auth-self openSUSE Leap 15.6:sudo-test openSUSE Leap 15.6:system-group-sudo moderate 3.1 CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:L