CVE-2021-43538

By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

CVSS v3.0 4.3 MEDIUM
CVSS v2.0 4.3 MEDIUM

4.3^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

4.3^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://www.mozilla.org/security/advisories/mfsa2021-52/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-54/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-53/	Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1739091	Issue Tracking Permissions Required Vendor Advisory
https://www.debian.org/security/2021/dsa-5026	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html	Mailing List Third Party Advisory
https://www.debian.org/security/2022/dsa-5034	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202202-03	Third Party Advisory
https://security.gentoo.org/glsa/202208-14	Third Party Advisory

Advertisement

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:firefox_esr::::::::
	cpe:2.3:a:mozilla:thunderbird::::::::
	cpe:2.3:a:mozilla:firefox::::::::

Configuration 2 (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:::::::*

Information

Published : 2021-12-08 14:15

Updated : 2022-12-09 07:55

NVD link : CVE-2021-43538

Mitre link : CVE-2021-43538

JSON object : View

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Advertisement

Products Affected

mozilla

firefox
firefox_esr
thunderbird

debian

debian_linux

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://www.mozilla.org/security/advisories/mfsa2021-52/", "name": "https://www.mozilla.org/security/advisories/mfsa2021-52/", "tags": ["Vendor Advisory"], "refsource": "MISC"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2021-54/", "name": "https://www.mozilla.org/security/advisories/mfsa2021-54/", "tags": ["Vendor Advisory"], "refsource": "MISC"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2021-53/", "name": "https://www.mozilla.org/security/advisories/mfsa2021-53/", "tags": ["Vendor Advisory"], "refsource": "MISC"}, {"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1739091", "name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1739091", "tags": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "refsource": "MISC"}, {"url": "https://www.debian.org/security/2021/dsa-5026", "name": "DSA-5026", "tags": ["Third Party Advisory"], "refsource": "DEBIAN"}, {"url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html", "name": "[debian-lts-announce] 20211229 [SECURITY] [DLA 2863-1] firefox-esr security update", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "MLIST"}, {"url": "https://www.debian.org/security/2022/dsa-5034", "name": "DSA-5034", "tags": ["Third Party Advisory"], "refsource": "DEBIAN"}, {"url": "https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html", "name": "[debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security update", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "MLIST"}, {"url": "https://security.gentoo.org/glsa/202202-03", "name": "GLSA-202202-03", "tags": ["Third Party Advisory"], "refsource": "GENTOO"}, {"url": "https://security.gentoo.org/glsa/202208-14", "name": "GLSA-202208-14", "tags": ["Third Party Advisory"], "refsource": "GENTOO"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-362"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2021-43538", "ASSIGNER": "security@mozilla.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 4.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 2.9, "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}}, "publishedDate": "2021-12-08T22:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "91.4.0"}, {"cpe23Uri": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "91.4.0"}, {"cpe23Uri": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "95.0"}]}, {"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}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2022-12-09T15:55Z"}