CVE-2019-20044 Information

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().

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://seclists.org/fulldisclosure/2020/May/49 http://seclists.org/fulldisclosure/2020/May/53 http://seclists.org/fulldisclosure/2020/May/55 http://seclists.org/fulldisclosure/2020/May/59 http://zsh.sourceforge.net/releases.html https://github.com/XMB5/zsh-privileged-upgrade https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/ https://security.gentoo.org/glsa/202003-55 https://support.apple.com/HT211168 https://support.apple.com/HT211170 https://support.apple.com/HT211171 https://support.apple.com/HT211175 https://support.apple.com/kb/HT211168 https://support.apple.com/kb/HT211170 https://support.apple.com/kb/HT211171 https://support.apple.com/kb/HT211175 https://www.zsh.org/mla/zsh-announce/141

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8