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. 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.

Affected

Mozilla · Thunderbird · Firefox ESR · Firefox

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 NVD

7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS

13.20% chance of exploitation in the next 30 days, 96th percentile

Published

2019-04-26

Updated

2024-08-04

Proof-of-concept exploits (2)

• http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value…
• https://bugzilla.mozilla.org/show_bug.cgi?id=1532599

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/46939

Security advisories

• https://www.mozilla.org/security/advisories/mfsa2019-07
• https://www.mozilla.org/security/advisories/mfsa2019-08
• https://www.mozilla.org/security/advisories/mfsa2019-11
• https://access.redhat.com/errata/RHSA-2019:0966
• https://access.redhat.com/errata/RHSA-2019:1144

References

• CVE Record
• NVD entry