VulnerabilityModified
CVE-2019-9792
The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout.
CRITICAL 9.8EPSS 13.2%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 13.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 13.20% probability · 96th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- mozilla/firefox · mozilla/thunderbird · redhat/enterprise linux · redhat/enterprise linux eus · redhat/enterprise linux server aus · redhat/enterprise linux server tus
- Source
- security@mozilla.org
References
- http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.htmlExploit, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1532599Exploit, Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-08/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-11/Vendor Advisory
- http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.htmlExploit, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1532599Exploit, Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-08/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-11/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.