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Gentoo: 202012-21 Low Severity: NSS Denial Of Service Risk

gentoo
Calendar Grey December 23, 2020
Dist Gentoo Esm H88
Explore Gentoo GLSA 202012-21 concerning the NSS flaw that enables remote assailants to initiate DoS incidents. Find out more details within.
A vulnerability in NSS might allow remote attackers to cause a Denial of Service condition.

Summary

A flaw was found in the way Mozilla Network Security Service (NSS) handled CCS (ChangeCipherSpec) messages in TLS 1.3.

Topics%20covered

Topics Covered

security advisory denial of service Gentoo gentoo remote attack low severity TLS NSS Denial of service nss tls 1.3

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
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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 security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity
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Severity: Low
Title: Mozilla Network Security Service (NSS): Denial of service
Date: December 23, 2020
Bugs: #750254
ID: 202012-21

Topics%20covered

Topics Covered

security advisory denial of service Gentoo gentoo remote attack low severity TLS NSS Denial of service nss tls 1.3

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.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-libs/nss < 3.58 >= 3.58

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.

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