Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2019-9792 — Out-of-bounds Write in Mozilla Firefox

CWE-787 — Out-of-bounds WriteCWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-203 — Observable Discrepancy16 documents9 sources
Severity
9.8CRITICALNVD
EPSS
18.9%
top 4.69%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
7
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+4 more
Timeline
PublishedApr 26
Latest updateMay 24

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:HExploitability: 3.9 | Impact: 5.9

Affected Packages6 packages

▶CVEListV5mozilla/firefoxunspecified — 66
▶NVDmozilla/firefox< 60.6.0+1
▶CVEListV5mozilla/firefox_esrunspecified — 60.6
▶CVEListV5mozilla/thunderbirdunspecified — 60.6
▶NVDmozilla/thunderbird< 60.6.0

Also affects: Enterprise Linux 8.0, 8.1, 8.2, 8.4

🔴Vulnerability Details

8
GHSA
GHSA-83fw-4w4c-4v29: The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout↗2022-05-24
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CVEList
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↗2019-04-26
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OSV
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↗2019-04-26
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OSV
firefox regressions↗2019-04-16
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OSV
thunderbird vulnerabilities↗2019-03-28
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💥Exploits & PoCs

1
Exploit-DB
Spidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Script↗2019-05-29
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📋Vendor Advisories

5
Ubuntu
Thunderbird vulnerabilities↗2019-03-28
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Ubuntu
Firefox vulnerabilities↗2019-03-25
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Ubuntu
Firefox vulnerabilities↗2019-03-21
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Red Hat
Mozilla: IonMonkey leaks JS_OPTIMIZED_OUT magic value to script↗2019-03-20
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Debian
CVE-2019-9792: firefox - The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT ...↗2019
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💬Community

1
Bugzilla
CVE-2019-9792 Mozilla: IonMonkey leaks JS_OPTIMIZED_OUT magic value to script↗2019-03-20
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CVE-2019-9792 — Out-of-bounds Write in Mozilla Firefox | cvebase