CVE-2021-43543: XSS
First published: Tue Dec 07 2021(Updated: )
Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by embedding additional content.
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/firefox | 118.0.2-1 | |
| debian/firefox-esr | 91.12.0esr-1~deb10u1 115.3.1esr-1~deb10u1 102.15.0esr-1~deb11u1 115.3.1esr-1~deb11u1 102.15.1esr-1~deb12u1 115.3.0esr-1~deb12u1 115.3.0esr-1 115.4.0esr-1 | |
| debian/thunderbird | 1:91.12.0-1~deb10u1 1:115.3.1-1~deb10u1 1:102.13.1-1~deb11u1 1:115.3.1-1~deb11u1 1:102.15.1-1~deb12u1 1:115.3.1-1~deb12u1 1:115.3.1-1 | |
| Thunderbird | <91.4 | 91.4 |
| Firefox | <95.0 | |
| Firefox ESR | <91.4.0 | |
| Thunderbird | <91.4.0 | |
| Debian | =9.0 | |
| Debian | =10.0 | |
| Debian | =11.0 | |
| Firefox | <95 | 95 |
| Firefox ESR | <91.4 | 91.4 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1738418
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-53/
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
- https://security.gentoo.org/glsa/202202-03
- https://security.gentoo.org/glsa/202208-14
- https://www.debian.org/security/2021/dsa-5026
- https://www.debian.org/security/2022/dsa-5034
- https://www.mozilla.org/security/advisories/mfsa2021-52/
- https://www.mozilla.org/security/advisories/mfsa2021-53/
- https://www.mozilla.org/security/advisories/mfsa2021-54/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/#CVE-2021-43543
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-53/#CVE-2021-43543
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/#CVE-2021-43543
- https://security-tracker.debian.org/tracker/CVE-2021-43543
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2021-43543?
CVE-2021-43543 is rated as a medium severity vulnerability.
How do I fix CVE-2021-43543?
To fix CVE-2021-43543, update Mozilla Thunderbird to version 91.4 or later, or update Firefox ESR to versions above 91.4.
Which software is affected by CVE-2021-43543?
CVE-2021-43543 affects Mozilla Thunderbird versions less than 91.4, Firefox ESR versions less than 91.4, and specific Debian packages of Firefox and Thunderbird.
What does CVE-2021-43543 allow attackers to do?
CVE-2021-43543 allows attackers to escape the sandbox's script restriction within documents loaded with the CSP sandbox directive.
Is CVE-2021-43543 a remote code execution vulnerability?
No, CVE-2021-43543 does not involve remote code execution but could lead to unauthorized content execution within the application's sandbox.
- collector/security-tracker-debian
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- version/debian/10.0
- version/debian/11.0