CVE-2019-9815
High
Description
If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks. Apple has shipped macOS 10.14.5 with an option to disable hyperthreading in applications running untrusted code in a thread through a new sysctl. Firefox now makes use of it on the main thread and any worker threads. *Note: users need to update to macOS 10.14.5 in order to take advantage of this change.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Mozilla Firefox
PublishedJul 23, 2019
First seenJul 23, 2019
How to fix
Update
- mozilla firefox67.0 or later
- mozilla firefox_esr60.7 or later
- mozilla thunderbird60.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 67.0 | 67.0 |
| mozilla firefox_esr | v < 60.7 | 60.7 |
| mozilla thunderbird | v < 60.7 | 60.7 |
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