CVE-2019-20044
Published: 24 February 2020
In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option. Zsh fails to overwrite the saved uid, so the original privileges can be restored by executing MODULE_PATH=/dir/with/module zmodload with a module that calls setuid().
Notes
| Author | Note |
|---|---|
| mdeslaur | reproducer in debian bug low priority since upstream considers this to be a "minor vulnerability" |
| rodrigo-zaiden | affects versions prior to 5.8, so only xenial and bionic needed to be patched. |
Priority
Status
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |