PT-2021-7346 · Mozilla+1 · Firefox+1

Pascal Chevrel · Published 2021-06-16 · Updated 2022-04-28 · CVE-2021-29968

Positive Technologies (AI Summary)

CVSS v2.0

9.4

High

Base vector

AV:N/AC:L/Au:N/C:C/I:N/A:C

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 89.0.1

Description The issue is related to an out of bounds read that could occur when drawing text onto a canvas with WebRender disabled. This could allow a remote attacker to disclose protected information using a specially crafted web page. The estimated number of potentially affected devices is not specified. The issue only affects Firefox on Windows, while other operating systems are unaffected.

Recommendations For versions prior to 89.0.1, update to version 89.0.1 or later to resolve the issue. As a temporary workaround, consider disabling WebRender to minimize the risk of exploitation. Restrict access to potentially vulnerable canvas elements to minimize the risk of exploitation.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2021-2016

ALT-PU-2021-3368

ALT-PU-2022-1782

BDU:2022-05745

CVE-2021-29968

Affected Products

Alt Linux

Firefox

References · 15

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/firefox_jit_use_after_free.rb · Exploit
• 🔥 https://github.com/aleksejspopovs/cve-2020-16012 · Exploit
• 🔥 https://github.com/rojhack/CVE-2020-6514 · Exploit
• 🔥 https://github.com/HassanAzze/CVE-2020-6514 · Exploit
• 🔥 https://github.com/R0jhack/CVE-2020-6514 · Exploit
• 🔥 https://github.com/hasan-khalil/CVE-2020-6514 · Exploit
• 🔥❌ https://github.com/marcinguy/CVE-2020-15999 · Exploit, Deleted
• https://mozilla.org/security/advisories/mfsa2021-27 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-29968 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-05745 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2021-27 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-29968 · Security Note
• https://bugzilla.mozilla.org/show_bug.cgi?id=1712047 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29968 · Security Note
• https://cybersecurity-help.cz/vdb/SB2021061612 · Note