#VU29653 Use of a broken or risky cryptographic algorithm in mbed TLS
Vulnerability identifier: #VU29653
Vulnerability risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-327
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
mbed TLS
Universal components / Libraries /
Libraries used by multiple products
Vendor: ARM
Description
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to incorrect implementation of modular inverse operation as implemented in Mbed TLS. An attacker with access to precise enough timing and memory access information (typically an untrusted operating system attacking a secure enclave such as SGX or the TrustZone secure world) can fully recover an ECDSA private key after observing a number of signature operations a.k.k. single-trace side channel attack.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
mbed TLS: 2.21.0, 2.20.0, 2.19.0 - 2.19.1, 2.18.0 - 2.18.1, 2.17.0, 2.16.0 - 2.16.5, 2.15.0 - 2.15.1, 2.14.0 - 2.14.1, 2.13.0 - 2.13.1, 2.11.0, 2.10.0, 2.9.0, 2.7.0 - 2.7.14, 2.6.0 - 2.6.1, 2.5.0 - 2.5.1, 2.4.0 - 2.4.2, 2.3.0, 2.2.0 - 2.2.1, 2.1.0 - 2.1.18, 2.0.0, 2.12.0, 2.8.0
External links
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/
http://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released
http://tls.mbed.org/tech-updates/security-advisories
http://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04
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.
