CVE-2021-43540
published 2021-12-08CVE-2021-43540: WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with…
PriorityP427medium6.5CVSS 3.1
AVNACLPRNUIRSUCNIHAN
EPSS
0.86%
54.1th percentile
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 95.0-1 (sid) | firefox 95.0-1 (sid) |
| mozilla | firefox | < 95.0 | 95.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 0 < 95.0.1+build2-0ubuntu0.18.04.1 | 95.0.1+build2-0ubuntu0.18.04.1 |
| mozilla | firefox | >= 0 < 95.0+build1-0ubuntu0.18.04.1 | 95.0+build1-0ubuntu0.18.04.1 |
| mozilla | firefox | >= 0 < 95.0.1+build2-0ubuntu0.20.04.1 | 95.0.1+build2-0ubuntu0.20.04.1 |
| mozilla | firefox | >= 0 < 95.0+build1-0ubuntu0.20.04.1 | 95.0+build1-0ubuntu0.20.04.1 |
| mozilla | firefox | >= 0 < 95.0+build1-0ubuntu1 | 95.0+build1-0ubuntu1 |
| mozilla | firefox | >= unspecified < 95 | 95 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
osv6.5MEDIUM
vendor_debian6.5MEDIUM
vendor_ubuntu6.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
firefox regressions
osv·2021-12-20·CVSS 6.5
[MEDIUM] firefox regressions
firefox regressions
USN-5186-1 fixed vulnerabilities in Firefox. The update introduced several
minor regressions. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, conduct spoofing attacks, bypass CSP restrictions, or
execute arbitrary code. (CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,
CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543,
CVE-2021-43545, CVE-2021-43546)
A security issue was discovered with the handling of WebExtension
permissions. If a user were tricked into installing a specially crafted
exte
GHSA
GHSA-vj37-39rq-5f3g: WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalle
ghsa_unreviewed·2021-12-09
CVE-2021-43540 [MEDIUM] CWE-732 GHSA-vj37-39rq-5f3g: WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalle
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
OSV
firefox vulnerabilities
osv·2021-12-09·CVSS 6.5
CVE-2021-43536 [MEDIUM] firefox vulnerabilities
firefox vulnerabilities
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, conduct spoofing attacks, bypass CSP restrictions, or
execute arbitrary code. (CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,
CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543,
CVE-2021-43545, CVE-2021-43546)
A security issue was discovered with the handling of WebExtension
permissions. If a user were tricked into installing a specially crafted
extension, an attacker could potentially exploit this to create and
install a service worker that wouldn't be uninstalled with the extension.
(CVE-2021-43540)
OSV
CVE-2021-43540: WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalle
osv·2021-12-08·CVSS 6.5
CVE-2021-43540 [MEDIUM] CVE-2021-43540: WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalle
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
Ubuntu
Firefox regressions
vendor_ubuntu·2021-12-20·CVSS 6.5
[MEDIUM] Firefox regressions
Title: Firefox regressions
Summary: USN-5186-1 caused some minor regressions in Firefox.
USN-5186-1 fixed vulnerabilities in Firefox. The update introduced several
minor regressions. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, conduct spoofing attacks, bypass CSP restrictions, or
execute arbitrary code. (CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,
CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543,
CVE-2021-43545, CVE-2021-43546)
A security issue was discovered with the handling of WebExtension
permis
Ubuntu
Firefox vulnerabilities
vendor_ubuntu·2021-12-09·CVSS 6.5
CVE-2021-43538 [MEDIUM] Firefox vulnerabilities
Title: Firefox vulnerabilities
Summary: Firefox could be made to crash or run programs as your login if it
opened a malicious website.
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, conduct spoofing attacks, bypass CSP restrictions, or
execute arbitrary code. (CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,
CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543,
CVE-2021-43545, CVE-2021-43546)
A security issue was discovered with the handling of WebExtension
permissions. If a user were tricked into installing a specially crafted
extension, an attacker could potentially exploit this to create and
install a s
Debian
CVE-2021-43540: firefox - WebExtensions with the correct permissions were able to create and install Servi...
vendor_debian·2021·CVSS 6.5
CVE-2021-43540 [MEDIUM] CVE-2021-43540: firefox - WebExtensions with the correct permissions were able to create and install Servi...
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
Scope: local
sid: resolved (fixed in 95.0-1)
Mozilla
Mozilla Foundation Security Advisory 2021-52: CVE-2021-43540
vendor_mozilla·CVSS 6.5
CVE-2021-43540 [MEDIUM] Mozilla Foundation Security Advisory 2021-52: CVE-2021-43540
Mozilla Foundation Security Advisory 2021-52
CVE: CVE-2021-43540
Product: Firefox
Impact: high
Fixed in: Firefox 95
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=1636629https://security.gentoo.org/glsa/202202-03https://www.mozilla.org/security/advisories/mfsa2021-52/https://bugzilla.mozilla.org/show_bug.cgi?id=1636629https://security.gentoo.org/glsa/202202-03https://www.mozilla.org/security/advisories/mfsa2021-52/
2021-12-08
Published