Critical severity · published Apr 26, 2019
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
9.8
CVSS
13.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)13.3% · higher than 96% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 60.6.0; before 66.0 · source: NVD
EL
Enterprise Linux · Redhat
8.0 · source: NVD
EL
Enterprise Linux Eus · Redhat
8.1; 8.2; 8.4 · source: NVD
EL
Enterprise Linux Server Aus · Redhat
8.2; 8.4 · source: NVD
EL
Enterprise Linux Server Tus · Redhat
8.2; 8.4 · source: NVD
TH
Thunderbird · Mozilla
before 60.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-9792
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-9792
Exploit
http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html
Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0966
Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1144
Exploit
https://bugzilla.mozilla.org/show_bug.cgi?id=1532599
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-07/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-08/
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