CVE-2020-12403

CRITICAL9.1

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3

Published May 27, 2021

Modified 1 years ago

No fix available

Details

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.

References

WEBhttps://bugzilla.redhat.com/show_bug.cgi?id=1868931 WEBhttps://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes WEBhttps://lists.debian.org/debian-lts-announce/2023/02/msg00021.html WEBhttps://security.netapp.com/advisory/ntap-20230324-0006/ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2020-12403

CVSS Analysis

CVSS v3.1

9.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

NoneI:N

Availability

HighA:H

9.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Weakness Type (CWE)

Memory Safety

CWE-125

Out-of-bounds Read

Ecosystems

Timeline

PublishedMay 27, 2021

ModifiedAug 4, 2024