CVE-2019-20044
Publication date 24 February 2020
Last updated 24 July 2024
Ubuntu priority
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().
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| zsh | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Fixed 5.4.2-3ubuntu3.2
|
|
| 16.04 LTS xenial |
Fixed 5.1.1-1ubuntu2.3+esm1
|
|
| 14.04 LTS trusty | Not in release |
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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.
Patch details
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.8 · High
|
| 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 |
References
Related Ubuntu Security Notices (USN)
- USN-5325-1
- Zsh vulnerabilities
- 14 March 2022