CVE-2020-12417 — Reachable Assertion in Mozilla Firefox

CWE-617 — Reachable AssertionCWE-681 — Incorrect Conversion between Numeric TypesCWE-787 — Out-of-bounds WriteCWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer15 documents9 sources
Severity
8.8HIGHNVD
OSV7.5OSV6.5
EPSS
0.5%
top 35.18%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+2 more
Timeline
PublishedJul 9
Latest updateMay 24

Description

Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially exploitable crash. *Note: this issue only affects Firefox on ARM64 platforms.* This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 2.8 | Impact: 5.9

Affected Packages10 packages

▶CVEListV5mozilla/firefoxunspecified — 78
▶NVDmozilla/firefox< 78.0
▶CVEListV5mozilla/firefox_esrunspecified — 68.10
▶NVDmozilla/firefox_esr< 68.10.0
▶Ubuntumozilla/firefox< 78.0.1+build1-0ubuntu0.16.04.1+2

Also affects: Ubuntu Linux 16.04, 18.04, 19.10, 20.04

🔴Vulnerability Details

5
GHSA
GHSA-h4ph-w5wh-mj4j: Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially↗2022-05-24
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CVEList
CVE-2020-12417: Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially↗2020-07-09
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OSV
CVE-2020-12417: Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially↗2020-07-09
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OSV
thunderbird vulnerabilities↗2020-07-08
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OSV
firefox vulnerabilities↗2020-07-02
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📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2020-07-08
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Ubuntu
Firefox vulnerabilities↗2020-07-02
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Red Hat
Mozilla: Memory corruption due to missing sign-extension for ValueTags on ARM64↗2020-06-30
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Debian
CVE-2020-12417: firefox - Due to confusion about ValueTags on JavaScript Objects, an object may pass throu...↗2020
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Mozilla
Mozilla Foundation Security Advisory 2020-26: CVE-2020-12417↗
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💬Community

1
Bugzilla
CVE-2020-12417 Mozilla: Memory corruption due to missing sign-extension for ValueTags on ARM64↗2020-07-01
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CVE-2020-12417 — Reachable Assertion in Mozilla Firefox | cvebase