CVE-2019-9815 — Observable Discrepancy in Mozilla Firefox

CWE-203 — Observable DiscrepancyCWE-385 — Covert Timing Channel6 documents6 sources
Severity
8.1HIGHNVD
EPSS
1.0%
top 22.74%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
6
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+3 more
Timeline
PublishedJul 23
Latest updateMay 24

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…

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 2.2 | Impact: 5.9

Affected Packages9 packages

▶CVEListV5mozilla/firefoxunspecified — 67
▶NVDmozilla/firefox< 67.0
▶CVEListV5mozilla/firefox_esrunspecified — 60.7

🔴Vulnerability Details

2
GHSA
GHSA-crxf-6fx4-jr2j: If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks↗2022-05-24
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OSV
CVE-2019-9815: If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks↗2019-07-23
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📋Vendor Advisories

2
Red Hat
Mozilla: Disable hyperthreading on content JavaScript threads on macOS↗2019-05-22
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Debian
CVE-2019-9815: firefox - If hyperthreading is not disabled, a timing attack vulnerability exists, similar...↗2019
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💬Community

1
Bugzilla
CVE-2019-9815 Mozilla: Disable hyperthreading on content JavaScript threads on macOS↗2019-05-22
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