CVE-2019-20044

moderate-risk

Published 2020-02-24

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().

Do I need to act?

0.07% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.8/10 High

LOCAL / LOW complexity

Affected Products (20)

Zsh

Fedora

Debian Linux

Ipados

Iphone Os

Mac Os X

Affected Vendors

Debian Apple Fedoraproject Zsh

References (40)

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

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

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

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

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

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

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

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

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

Third Party Advisory https://security.gentoo.org/glsa/202003-55

Third Party Advisory https://support.apple.com/HT211168

Third Party Advisory https://support.apple.com/HT211170

Third Party Advisory https://support.apple.com/HT211171

Third Party Advisory https://support.apple.com/HT211175

Third Party Advisory https://support.apple.com/kb/HT211168

Third Party Advisory https://support.apple.com/kb/HT211170

Third Party Advisory https://support.apple.com/kb/HT211171

Third Party Advisory https://support.apple.com/kb/HT211175

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

and 20 more references

/ 100

moderate-risk

Severity 24/34 · High

Exploitability 0/34 · Minimal

Exposure 23/34 · High