Local side channel attack in mbed Crypto and mbed TLS - #VU54628
Published: July 8, 2021
Vulnerability identifier: #VU54628
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-208
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to observable timing discrepancy. An attacker with access to precise enough timing and memory access information (for example, able to execute arbitrary code and sharing a memory cache with the victim) can recover the private keys used in static Diffie-Hellman with x25519 and x448.
Affected software
mbed Crypto
mbed TLS
mbed TLS
Remediation
Install updates from vendor's website.
mbed TLS - addressed in versions 2.16.11, 2.27.0