CVE-2021-23999 — Improper Privilege Management in Mozilla Firefox

CWE-269 — Improper Privilege ManagementCWE-697 — Incorrect ComparisonCWE-281 — Improper Preservation of Permissions15 documents8 sources
Severity
8.8HIGHNVD
OSV7.4
EPSS
0.2%
top 64.08%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedJun 24
Latest updateMay 24

Description

If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

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 Packages9 packages

▶CVEListV5mozilla/firefoxunspecified — 88
▶NVDmozilla/firefox< 88.0
▶CVEListV5mozilla/firefox_esrunspecified — 78.10
▶NVDmozilla/firefox_esr< 78.10
▶Ubuntumozilla/firefox< 88.0+build2-0ubuntu0.16.04.1+2

🔴Vulnerability Details

6
GHSA
GHSA-f4hx-f2xg-27cv: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges th↗2022-05-24
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OSV
thunderbird vulnerabilities↗2021-06-25
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OSV
CVE-2021-23999: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges th↗2021-06-24
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CVEList
CVE-2021-23999: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges th↗2021-06-24
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OSV
thunderbird vulnerabilities↗2021-06-22
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📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2021-06-25
▶
Ubuntu
Thunderbird vulnerabilities↗2021-06-22
▶
Ubuntu
Firefox vulnerabilities↗2021-04-26
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Red Hat
Mozilla: Blob URLs may have been granted additional privileges↗2021-04-19
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Debian
CVE-2021-23999: firefox - If a Blob URL was loaded through some unusual user interaction, it could have be...↗2021
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CVE-2021-23999 — Improper Privilege Management | cvebase