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Gentoo Linux Security Advisory GLSA 202012-21
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https://security.gentoo.org/
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Severity: Low
Title: Mozilla Network Security Service (NSS): Denial of service
Date: December 23, 2020
Bugs: #750254
ID: 202012-21
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Synopsis
========
A vulnerability in NSS might allow remote attackers to cause a Denial
of Service condition.
Background
==========
The Mozilla Network Security Service (NSS) is a library implementing
security features like SSL v.2/v.3, TLS, PKCS #5, PKCS #7, PKCS #11,
PKCS #12, S/MIME and X.509 certificates.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-libs/nss < 3.58 >= 3.58
Description
===========
A flaw was found in the way Mozilla Network Security Service (NSS)
handled CCS (ChangeCipherSpec) messages in TLS 1.3.
Impact
======
A remote attacker could send multiple crafted CSS messages in row after
ClientHello message to a server application linked against NSS library,
possibly resulting in a Denial of Service condition.
Workaround
==========
Disable TLS 1.3 protocol.
Resolution
==========
All NSS users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/nss-3.58"
References
==========
[ 1 ] CVE-2020-25648
https://nvd.nist.gov/vuln/detail/CVE-2020-25648
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202012-21
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
secur...@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.
License
=======
Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
https://creativecommons.org/licenses/by-sa/2.5
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