CVE-2020-12387: Use After Free
First published: Tue May 05 2020(Updated: )
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash.
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <68.8 | 68.8 |
| Mozilla Thunderbird | <68.8 | 68.8 |
| Mozilla Firefox | <76 | 76 |
| Mozilla Firefox | <76.0 | |
| Mozilla Firefox ESR | <68.8.0 | |
| Mozilla Thunderbird | <68.8.0 | |
| debian/firefox | 130.0-2 | |
| debian/firefox-esr | 115.14.0esr-1~deb11u1 115.15.0esr-1~deb11u1 115.14.0esr-1~deb12u1 115.15.0esr-1~deb12u1 115.15.0esr-1 | |
| debian/thunderbird | 1:115.12.0-1~deb11u1 1:115.15.0-1~deb11u1 1:115.12.0-1~deb12u1 1:115.15.0-1~deb12u1 1:128.1.1esr-1 1:128.2.0esr-1 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1545345
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-17/
- https://www.mozilla.org/security/advisories/mfsa2020-16/
- https://www.mozilla.org/security/advisories/mfsa2020-17/
- https://www.mozilla.org/security/advisories/mfsa2020-18/
- https://usn.ubuntu.com/4373-1/
- https://security.gentoo.org/glsa/202005-03
- https://security.gentoo.org/glsa/202005-04
- https://launchpad.net/bugs/cve/CVE-2020-12387
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-17/#CVE-2020-12387
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-18/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12387
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-18/#CVE-2020-12387
- https://security-tracker.debian.org/tracker/CVE-2020-12387
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12387
- https://nvd.nist.gov/vuln/detail/CVE-2020-12387
- https://ubuntu.com/security/CVE-2020-12387
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2020-12387?
CVE-2020-12387 is classified as a medium severity vulnerability that can lead to a potential crash.
How do I fix CVE-2020-12387?
To fix CVE-2020-12387, upgrade to the latest versions of Firefox, Firefox ESR, or Thunderbird that contain the remediation.
Which versions are affected by CVE-2020-12387?
CVE-2020-12387 affects Mozilla Firefox versions up to 76, Firefox ESR up to 68.8, and Thunderbird versions up to 68.8.
What type of vulnerability is CVE-2020-12387?
CVE-2020-12387 is a use-after-free vulnerability caused by a race condition during the shutdown of Web Workers.
Can CVE-2020-12387 be exploited remotely?
CVE-2020-12387 may lead to a crash, which could potentially be exploited by an attacker under certain conditions.
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