Side-channel attack in Arm Mbed Crypto and Mbed TLS



| Updated: 2020-03-11
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-18222
CWE-ID CWE-310
Exploitation vector Local
Public exploit N/A
Vulnerable software
 mbed TLS
Universal components / Libraries / Libraries used by multiple products

mbed Crypto
Universal components / Libraries / Libraries used by multiple products

Vendor ARM

Security Bulletin

This security bulletin contains one low risk vulnerability.

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 updates from vendor's website.

Vulnerable software versions

mbed TLS: 2.7.0 - 2.19.1

mbed Crypto: 2.0.0d0 - 3.0.0

CPE2.3 External links

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A3GWQNONS7GRORXZJ7MOJFUEJ2ZJ4OUW/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NGDACU65MYZXXVPQP2EBHUJGOR4RWLVY/
https://tls.mbed.org/tech-updates/security-advisories
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2019-12


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.



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