cve/2019/CVE-2019-20044.md

CVE-2019-20044

Description

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().

POC

Reference

• http://seclists.org/fulldisclosure/2020/May/53
• http://seclists.org/fulldisclosure/2020/May/53
• http://seclists.org/fulldisclosure/2020/May/55
• http://seclists.org/fulldisclosure/2020/May/55
• http://seclists.org/fulldisclosure/2020/May/59
• http://seclists.org/fulldisclosure/2020/May/59

Github

• https://github.com/MRXXII/zsh