[SECURITY] [DLA 3327-1] nss security update

Debian LTS Advisory DLA-3327-1 [email protected]
https://www.debian.org/lts/security/ Markus Koschany
February 20, 2023 https://wiki.debian.org/LTS

Package : nss
Version : 2:3.42.1-1+deb10u6
CVE ID : CVE-2020-6829 CVE-2020-12400 CVE-2020-12401 CVE-2020-12403
CVE-2023-0767

Multiple security vulnerabilities have been discovered in nss, the Network
Security Service libraries.

CVE-2020-6829

When performing EC scalar point multiplication, the wNAF point
multiplication algorithm was used; which leaked partial information about
the nonce used during signature generation. Given an electro-magnetic trace
of a few signature generations, the private key could have been computed.

CVE-2020-12400

When converting coordinates from projective to affine, the modular
inversion was not performed in constant time, resulting in a possible
timing-based side channel attack.

CVE-2020-12401

During ECDSA signature generation, padding applied in the nonce designed to
ensure constant-time scalar multiplication was removed, resulting in
variable-time execution dependent on secret data.

CVE-2020-12403

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS.
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.

CVE-2023-0767

Christian Holler discovered that incorrect handling of PKCS 12 Safe Bag
attributes may result in execution of arbitrary code if a specially crafted
PKCS 12 certificate bundle is processed.

For Debian 10 buster, these problems have been fixed in version
2:3.42.1-1+deb10u6.

We recommend that you upgrade your nss packages.

For the detailed security status of nss please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/nss

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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