Use of a broken or risky cryptographic algorithm in nss (Alpine package)

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU45797

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-12400

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists in Mozilla NSS library in the way P-384 and P-521 curves are used in the generation of EDSA signatures, leaking partial information about the ECDSA nonce. Given a small number of ECDSA signatures, this information can be used to steal the private key.

Mitigation

Install update from vendor's website.

Vulnerable software versions

nss (Alpine package): 3.52.1-r0 - 3.55-r1

nss (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:nss_alpine_package:3.52.1-r0:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:o:alpine:nss_alpine_package:3.53.1-r0:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:o:alpine:nss_alpine_package:3.54-r0:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:o:alpine:nss_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=73339ff65b8ac577d3c49b1bae6fe0c5d8cf2e98

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.