CVE-2018-18500
Critical
Description
A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Mozilla Firefox
PublishedFeb 5, 2019
First seenFeb 5, 2019
How to fix
Update
- mozilla firefox65.0 or later
- mozilla firefox_esr60.5 or later
- mozilla thunderbird60.5 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2019:0219
- usn.ubuntu.com/3897-1/
- security.gentoo.org/glsa/201903-04
- usn.ubuntu.com/3874-1/
- access.redhat.com/errata/RHSA-2019:0269
- access.redhat.com/errata/RHSA-2019:0218
- debian.org/security/2019/dsa-4376
- debian.org/security/2019/dsa-4392
- access.redhat.com/errata/RHSA-2019:0270
- security.gentoo.org/glsa/201904-07
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 65.0 | 65.0 |
| mozilla firefox_esr | v < 60.5 | 60.5 |
| mozilla thunderbird | v < 60.5 | 60.5 |
| canonical ubuntu_linux | 14.04, 16.04, 18.04, 18.10 | — |
| debian debian_linux | 8.0, 9.0 | — |
| redhat enterprise_linux_desktop | 6.0, 7.0 | — |
| redhat enterprise_linux_server | 6.0, 7.0 | — |
| redhat enterprise_linux_server_aus | 7.6 | — |
| redhat enterprise_linux_server_eus | 7.6 | — |
| redhat enterprise_linux_server_tus | 7.6 | — |
| redhat enterprise_linux_workstation | 6.0, 7.0 | — |
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