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Status published
High
CVE-2019-20044
In Zsh before 5.8, attackers able to execute commands can...
Vulnerability 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().
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- http://zsh.sourceforge.net/releases.html
- https://github.com/XMB5/zsh-privileged-upgrade
- https://www.zsh.org/mla/zsh-announce/141
- https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/
- https://security.gentoo.org/glsa/202003-55
- https://support.apple.com/kb/HT211170
- https://support.apple.com/kb/HT211175
- https://support.apple.com/kb/HT211171
- https://support.apple.com/kb/HT211168
- http://seclists.org/fulldisclosure/2020/May/49
- http://seclists.org/fulldisclosure/2020/May/55
- http://seclists.org/fulldisclosure/2020/May/53
- http://seclists.org/fulldisclosure/2020/May/59
- https://support.apple.com/HT211168
- https://support.apple.com/HT211170
- https://support.apple.com/HT211171
- https://support.apple.com/HT211175
- https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html
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Affected Vendor
Affected Software
zsh, fedora, debian linux, ipados, iphone os, mac os x, tvos, watchos
Vulnerable Versions:
0, 30, 31, 8.0, 9.0, 10.13.0, 10.14.0, 10.15, 10.13.6, 10.14.6
Timeline
Official Publish:
February 24th, 2020
Last Modified:
August 5th, 2024
Added to House:
July 20th, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.