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().

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.08%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory zsh.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://zsh.sourceforge.net/releases.html third party advisory release notes
https://github.com/XMB5/zsh-privileged-upgrade broken link
https://www.zsh.org/mla/zsh-announce/141 release notes vendor advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/ vendor advisory
https://security.gentoo.org/glsa/202003-55 third party advisory vendor advisory
https://support.apple.com/kb/HT211170 third party advisory
https://support.apple.com/kb/HT211175 third party advisory
https://support.apple.com/kb/HT211171 third party advisory
https://support.apple.com/kb/HT211168 third party advisory
http://seclists.org/fulldisclosure/2020/May/49 third party advisory mailing list
http://seclists.org/fulldisclosure/2020/May/55 third party advisory mailing list
http://seclists.org/fulldisclosure/2020/May/53 third party advisory mailing list
http://seclists.org/fulldisclosure/2020/May/59 third party advisory mailing list
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://lists.debian.org/debian-lts-announce/2020/12/msg00000.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2019-20044?
CVE-2019-20044 has been scored as a high severity vulnerability.
How to fix CVE-2019-20044?
To fix CVE-2019-20044, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-20044 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-20044 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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