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().
Priority
Low
CVSS 3 base score: 7.8
Status
| Package | Release | Status |
|---|---|---|
|
zsh Launchpad, Ubuntu, Debian |
bionic |
Released
(5.4.2-3ubuntu3.2)
|
| eoan |
Ignored
(reached end-of-life)
|
|
| focal |
Not vulnerable
(5.8-3ubuntu1)
|
|
| groovy |
Not vulnerable
(5.8-3ubuntu1)
|
|
| hirsute |
Not vulnerable
(5.8-3ubuntu1)
|
|
| impish |
Not vulnerable
(5.8-3ubuntu1)
|
|
| precise |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(5.8-1)
|
|
| xenial |
Released
(5.1.1-1ubuntu2.3+esm1)
|
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. |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20044
- https://www.zsh.org/mla/zsh-announce/141
- https://ubuntu.com/security/notices/USN-5325-1
- NVD
- Launchpad
- Debian