CVE-2021-45444

In zsh before 5.8.1, an attacker can achieve code execution if they control a command output inside the prompt, as demonstrated by a %F argument. This occurs because of recursive PROMPT_SUBST expansion.

CVSS v3.0 7.8 HIGH
CVSS v2.0 5.1 MEDIUM

7.8^/10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

5.1^/10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:H/Au:N/C:P/I:P/A:P

Exploitability : 4.9 / Impact : 6.4

Access Vector NETWORK

Access Complexity HIGH

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://zsh.sourceforge.io/releases.html	Release Notes Third Party Advisory
https://vuln.ryotak.me/advisories/63	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2P3LPMGENEHKDWFO4MWMZSZL6G7Y4CV7/	Mailing List Third Party Advisory
https://www.debian.org/security/2022/dsa-5078	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00020.html	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BWF3EXNBX5SVFDBL4ZFOD4GJBWFUKWN4/	Mailing List Third Party Advisory
https://support.apple.com/kb/HT213255	Third Party Advisory
https://support.apple.com/kb/HT213256	Third Party Advisory
https://support.apple.com/kb/HT213257	Third Party Advisory
http://seclists.org/fulldisclosure/2022/May/33	Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2022/May/35	Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2022/May/38	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:zsh:zsh:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:fedoraproject:fedora:34:::::::*
	cpe:2.3:o:fedoraproject:fedora:35:::::::*

Configuration 3 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:debian:debian_linux:10.0:::::::*
	cpe:2.3:o:debian:debian_linux:11.0:::::::*

Configuration 4 (hide)

OR	cpe:2.3:o:apple:mac_os_x::::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-005::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-007::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-002::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001::::::
	cpe:2.3:o:apple:macos::::::::
	cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003::::::
	cpe:2.3:o:apple:macos::::::::

Information

Published : 2022-02-14 04:15

Updated : 2022-09-29 19:37

NVD link : CVE-2021-45444

Mitre link : CVE-2021-45444

JSON object : View

CWE

NVD-CWE-noinfo

Products Affected

apple

macos
mac_os_x

zsh

fedoraproject

fedora

debian

debian_linux

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This occurs because of recursive PROMPT_SUBST expansion."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2021-45444", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 5.1, "accessVector": "NETWORK", "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "HIGH", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 6.4, "obtainAllPrivilege": false, "exploitabilityScore": 4.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}}, "publishedDate": "2022-02-14T12:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:zsh:zsh:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "5.8.1"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "10.15.7", "versionStartIncluding": "10.15"}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-005:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-007:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-002:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "11.6.6", "versionStartIncluding": "11.0"}, {"cpe23Uri": "cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "12.4", "versionStartIncluding": "12.0.0"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2022-09-30T02:37Z"}

7.8 /10