Vulnerability in Apple macOS
CVE-2019-9815
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.018 (78.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Apple macOS
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
References
- www.mozilla.org/security/advisories/mfsa2019-13/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2019-15/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2019-14/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Third Party Advisory)
- mdsattacks.com/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-9815?
- CVE-2019-9815 is a high-severity vulnerability in Apple macOS, classified under Observable Discrepancy. CVSS score: 8.1/10. Published 2019-07-23.
- How severe is CVE-2019-9815?
- High severity. CVSS v3 base score is 8.1 out of 10.