In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command (within Bash) by a different user, as demonstrated by logging in as root and entering umount followed by a tab character for autocompletion.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Util-linux | Kernel | * | 2.31 (including) |
| Bash-completion | Ubuntu | artful | * |
| Bash-completion | Ubuntu | cosmic | * |
| Bash-completion | Ubuntu | disco | * |
| Bash-completion | Ubuntu | eoan | * |
| Bash-completion | Ubuntu | trusty | * |
| Util-linux | Ubuntu | artful | * |
| Util-linux | Ubuntu | bionic | * |
| Util-linux | Ubuntu | esm-infra/bionic | * |
| Util-linux | Ubuntu | trusty | * |
| Util-linux | Ubuntu | upstream | * |
References
- http://www.securityfocus.com/bid/103367
- https://bugs.debian.org/892179
- https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55
- https://github.com/karelzak/util-linux/issues/539
- https://usn.ubuntu.com/4512-1/
- https://www.debian.org/security/2018/dsa-4134
- http://www.securityfocus.com/bid/103367
- https://bugs.debian.org/892179
- https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55
- https://github.com/karelzak/util-linux/issues/539
- https://security.netapp.com/advisory/ntap-20241213-0002/
- https://usn.ubuntu.com/4512-1/
- https://www.debian.org/security/2018/dsa-4134