Cryptographic issues in mbedtls (Alpine package)

1) Cryptographic issues

EUVDB-ID: #VU26020

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-2019-18222

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows an attacker to gain access to sensitive information.

the vulnerability exists due to the ECDSA signature implementation in ecdsa.c in Arm Mbed Crypto 2.1 and Mbed TLS through 2.19.1 does not reduce the blinded scalar before computing the inverse, which allows a local attacker to recover the private key via side-channel attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

mbedtls (Alpine package): 2.16.1-r1 - 2.16.3-r0

mbedtls (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:mbedtls_alpine_package:2.16.1-r1:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:o:alpine:mbedtls_alpine_package:2.16.2-r0:*:*:*:*:alpine_linux:*:3.10
• cpe:2.3:o:alpine:mbedtls_alpine_package:2.16.3-r0:*:*:*:*:alpine_linux:*:3.10
• cpe:2.3:o:alpine:mbedtls_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=7c957c41625c408c47ca8aa93fd986ac6fec39a2
https://git.alpinelinux.org/aports/commit/?id=c087d07fafa8d964c90795fd34c46fda72a152a4
https://git.alpinelinux.org/aports/commit/?id=f0377de9384c6b80e8d69a847c1c2450f68f50da

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.