CVE-2019-9796: Use After Free
First published: Tue Mar 19 2019(Updated: )
A use-after-free vulnerability can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected. When a registration is later freed with the removal of the animation controller element, the refresh driver incorrectly leaves a dangling pointer to the driver's observer array.
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Thunderbird | <60.6 | 60.6 |
| Mozilla Firefox ESR | <60.6 | 60.6 |
| Mozilla Firefox | <66 | 66 |
| Mozilla Firefox | <66.0 | |
| Mozilla Firefox ESR | <60.6.0 | |
| Mozilla Thunderbird | <60.6.0 | |
| debian/firefox | 132.0.1-1 | |
| debian/firefox-esr | 115.14.0esr-1~deb11u1 128.4.0esr-1~deb11u1 128.3.1esr-1~deb12u1 128.4.0esr-1~deb12u1 128.3.1esr-2 128.4.0esr-1 | |
| debian/thunderbird | 1:115.12.0-1~deb11u1 1:128.4.0esr-1~deb11u1 1:115.16.0esr-1~deb12u1 1:128.4.0esr-1~deb12u1 1:128.4.0esr-1 1:128.4.2esr-1 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1531277
- https://www.mozilla.org/security/advisories/mfsa2019-07/
- https://www.mozilla.org/security/advisories/mfsa2019-08/
- https://www.mozilla.org/security/advisories/mfsa2019-11/
- https://access.redhat.com/errata/RHSA-2019:0966
- https://access.redhat.com/errata/RHSA-2019:1144
- https://launchpad.net/bugs/cve/CVE-2019-9796
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-08/#CVE-2019-9796
- https://access.redhat.com/errata/RHSA-2019:0622
- https://access.redhat.com/errata/RHSA-2019:0623
- https://access.redhat.com/errata/RHSA-2019:0680
- https://access.redhat.com/errata/RHSA-2019:0681
- https://bugzilla.redhat.com/show_bug.cgi?id=1690681
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-11/
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-08/
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9788
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9796
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-11/#CVE-2019-9796
- https://security-tracker.debian.org/tracker/CVE-2019-9796
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9796
- https://nvd.nist.gov/vuln/detail/CVE-2019-9796
- https://ubuntu.com/security/CVE-2019-9796
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2019-9796?
CVE-2019-9796 is a use-after-free vulnerability that can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected.
What is the severity of CVE-2019-9796?
The severity of CVE-2019-9796 is critical with a CVSS score of 9.8.
How does CVE-2019-9796 affect Firefox?
CVE-2019-9796 affects Firefox versions 66.0 and above.
How do I fix CVE-2019-9796 in Firefox?
To fix CVE-2019-9796 in Firefox, update to version 66.0 or above.
Where can I find more information about CVE-2019-9796?
More information about CVE-2019-9796 can be found on the Mozilla website: [https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/](https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/)
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