Debian Security Advisory

DLA-3327-1 nss -- LTS security update

Date Reported:

20 Feb 2023

Affected Packages:

nss

Vulnerable:

Yes

Security database references:

In Mitre's CVE dictionary: CVE-2020-6829, CVE-2020-12400, CVE-2020-12401, CVE-2020-12403, CVE-2023-0767.

More information:

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