CVE-2021-43539: Use After Free
First published: Tue Dec 07 2021(Updated: )
Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash.
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=1739683
- 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-2021-43539
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-53/#CVE-2021-43539
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/#CVE-2021-43539
- https://security-tracker.debian.org/tracker/CVE-2021-43539
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2021-43539?
CVE-2021-43539 has a high severity rating due to its potential to cause a use-after-free vulnerability.
How do I fix CVE-2021-43539?
To fix CVE-2021-43539, update Mozilla Thunderbird to version 91.4 or later, and update Firefox and Firefox ESR to the respective fixed versions.
Which software versions are affected by CVE-2021-43539?
CVE-2021-43539 affects Mozilla Thunderbird versions prior to 91.4, Firefox versions before 95, and Firefox ESR versions prior to 91.4.
Can CVE-2021-43539 lead to system crashes?
Yes, CVE-2021-43539 can lead to crashes due to potential use-after-free errors.
What happens if I don't address CVE-2021-43539?
If CVE-2021-43539 is not addressed, it could allow attackers to exploit the vulnerability, potentially leading to crashes and unauthorized access.
- collector/security-tracker-debian
- agent/type
- agent/first-publish-date
- agent/severity
- agent/references
- agent/description
- agent/weakness
- collector/mitre-cve
- source/MITRE
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- collector/mozilla-advisory
- agent/software-canonical-lookup-request
- source/Mozilla
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- collector/nvd-api
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- agent/tags
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- canonical/thunderbird
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