Out-of-bounds Read

Affecting nss package, versions <2:3.26.2-1.1+deb9u2

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NVD Description

Note: Versions mentioned in the description apply to the upstream nss package. See Remediation section below for Debian:9 relevant versions.

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.

Remediation

Upgrade Debian:9 nss to version 2:3.26.2-1.1+deb9u2 or higher.

References

CVSS Score

9.1
critical severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    None
  • Availability
    High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVE
CVE-2020-12403
CWE
CWE-125
Snyk ID
SNYK-DEBIAN9-NSS-608062
Disclosed
27 May, 2021
Published
21 Aug, 2020