PT-2022-11569 · Mozilla+1 · Firefox+1

Rohan Sharma · Published 2022-12-22 · Updated 2023-07-11 · CVE-2021-4221

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 92

Description The issue arises when a domain name contains a Right-to-Left (RTL) character, causing the domain to be rendered to the right of the path. This can lead to user confusion and potentially facilitate spoofing attacks. The bug specifically affects Firefox for Android, with other operating systems being unaffected.

Recommendations For versions prior to 92, update to version 92 or later to resolve the issue. As a temporary workaround, consider avoiding the use of domain names with RTL characters in Firefox for Android until the update is applied.

Exploit

Fix

Weakness Enumeration

CWE-1007

Related Identifiers

ALT-PU-2023-4336

CVE-2021-4221

Affected Products

Alt Linux

Firefox

References · 5

• 🔥 https://bugzilla.mozilla.org/show_bug.cgi?id=1704422 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-4221 · Security Note
• https://osv.dev/vulnerability/CVE-2021-4221 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2021-38 · Vendor Advisory
• https://t.me/cibsecurity/55131 · Telegram Post