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CVE-2019-20044

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Date: February 24, 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().

Language: C

Severity Score

Related Resources (28)

https://support.apple.com/HT211168
https://support.apple.com/kb/HT211175
http://seclists.org/fulldisclosure/2020/May/59
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/
https://nvd.nist.gov/vuln/detail/CVE-2019-20044
https://security.gentoo.org/glsa/202003-55
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/
http://zsh.sourceforge.net/releases.html
http://seclists.org/fulldisclosure/2020/May/55
http://seclists.org/fulldisclosure/2020/May/53
https://security-tracker.debian.org/tracker/CVE-2019-20044
https://support.apple.com/kb/HT211171
https://security.alpinelinux.org/vuln/CVE-2019-20044
https://support.apple.com/kb/HT211170
https://www.zsh.org/mla/zsh-announce/141
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-20044
http://seclists.org/fulldisclosure/2020/May/49
https://support.apple.com/HT211175
https://support.apple.com/kb/HT211168
https://support.apple.com/HT211171
https://github.com/XMB5/zsh-privileged-upgrade
https://support.apple.com/HT211170
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/
https://access.redhat.com/security/cve/CVE-2019-20044
https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html
https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/
https://www.mend.io/vulnerability-database/CVE-2019-20044

Severity Score

Weakness Type (CWE)

Improper Check for Dropped Privileges

CWE-273

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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