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().

References

https://www.zsh.org/mla/zsh-announce/141

https://support.apple.com/kb/HT211175

https://support.apple.com/kb/HT211171

https://support.apple.com/kb/HT211170

https://support.apple.com/kb/HT211168

https://support.apple.com/HT211175

https://support.apple.com/HT211171

https://support.apple.com/HT211170

https://support.apple.com/HT211168

https://security.gentoo.org/glsa/202003-55

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/

https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html

https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html

https://github.com/XMB5/zsh-privileged-upgrade

http://zsh.sourceforge.net/releases.html

http://seclists.org/fulldisclosure/2020/May/59

http://seclists.org/fulldisclosure/2020/May/55

http://seclists.org/fulldisclosure/2020/May/53

http://seclists.org/fulldisclosure/2020/May/49

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3