Vulnerability Monitor

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CVE-2019-20044

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().

Published

2020-02-24T14:15:11.667

Last Modified

2024-11-21T04:37:56.997

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.9

Impact Score

10.0

Weaknesses

Type: Primary
CWE-273

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	zsh	zsh	< 5.8	Yes
Operating System	apple	macos	-	No
Operating System	linux	linux_kernel	-	No
Operating System	fedoraproject	fedora	30	Yes
Operating System	fedoraproject	fedora	31	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	apple	ipados	< 13.5	Yes
Operating System	apple	iphone_os	< 13.5	Yes
Operating System	apple	mac_os_x	< 10.15.5	Yes
Operating System	apple	mac_os_x	< 10.13.6	Yes
Operating System	apple	mac_os_x	< 10.14.6	Yes
Operating System	apple	mac_os_x	< 10.15.5	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	tvos	< 13.4.5	Yes
Operating System	apple	watchos	< 6.2.5	Yes

References

http://seclists.org/fulldisclosure/2020/May/49 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/May/53 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/May/55 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/May/59 Mailing List, Third Party Advisory ([email protected])
http://zsh.sourceforge.net/releases.html Release Notes, Third Party Advisory ([email protected])
https://github.com/XMB5/zsh-privileged-upgrade Broken Link ([email protected])
https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html Mailing List, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html Mailing List, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/ ([email protected])
https://security.gentoo.org/glsa/202003-55 Third Party Advisory ([email protected])
https://support.apple.com/HT211168 Third Party Advisory ([email protected])
https://support.apple.com/HT211170 Third Party Advisory ([email protected])
https://support.apple.com/HT211171 Third Party Advisory ([email protected])
https://support.apple.com/HT211175 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211168 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211170 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211171 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211175 Third Party Advisory ([email protected])
https://www.zsh.org/mla/zsh-announce/141 Release Notes, Vendor Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/May/49 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/May/53 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/May/55 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/May/59 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://zsh.sourceforge.net/releases.html Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/XMB5/zsh-privileged-upgrade Broken Link (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/ (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202003-55 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT211168 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT211170 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT211171 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT211175 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211168 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211170 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211171 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211175 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.zsh.org/mla/zsh-announce/141 Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)