CVE-2020-12403

Published: 18 August 2020

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.

Priority

Medium

CVSS 3 base score: 9.1

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12403
• https://access.redhat.com/security/cve/CVE-2020-12403
• https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes
• https://ubuntu.com/security/notices/USN-4476-1
• NVD
• Launchpad
• Debian

Bugs

• https://bugzilla.mozilla.org/show_bug.cgi?id=1636771 (private)