1) Local side channel attack
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] [PCI]
CVE-ID: N/A
CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy
Exploit availability: No
Description
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.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
mbed TLS: 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.3.8, 1.3.9, 1.3.10, 1.3.11, 1.3.12, 1.3.13, 1.3.14, 1.3.15, 1.3.16, 1.3.17, 1.3.18, 1.3.19, 1.3.20, 1.3.21, 1.3.22, 2.0.0, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.1.7, 2.1.8, 2.1.9, 2.1.10, 2.1.11, 2.1.12, 2.1.13, 2.1.14, 2.1.15, 2.1.16, 2.1.17, 2.1.18, 2.2.0, 2.2.1, 2.3.0, 2.4.0, 2.4.1, 2.4.2, 2.5.0, 2.5.1, 2.6.0, 2.6.1, 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4, 2.7.5, 2.7.6, 2.7.7, 2.7.8, 2.7.9, 2.7.10, 2.7.11, 2.7.12, 2.7.13, 2.7.14, 2.7.15, 2.7.16, 2.7.17, 2.7.18, 2.7.19, 2.8.0, 2.9.0, 2.10.0, 2.11.0, 2.12.0, 2.13.0, 2.13.1, 2.14.0, 2.14.1, 2.15.0, 2.15.1, 2.16.0, 2.16.1, 2.16.2, 2.16.3, 2.16.4, 2.16.5, 2.16.6, 2.16.7, 2.16.8, 2.16.9, 2.16.10, 2.17.0, 2.18.0, 2.18.1, 2.19.0, 2.19.1, 2.20.0, 2.21.0, 2.22.0, 2.23.0, 2.24.0, 2.25.0, 2.26.0
mbed Crypto: 0.1.0a, 0.1.0b, 0.1.0b2, 1.0.0, 1.0.0d0, 1.0.0d1, 1.0.0d2, 1.0.0d3, 1.0.0d4, 1.0.0d5, 1.0.0d6, 1.0.0d7, 1.1.0, 1.1.0d0, 1.1.0d1, 1.1.0d2, 1.1.1, 2.0.0, 2.0.0d0, 2.0.0d1, 2.0.0d2, 2.1.0d0, 3.0.0, 3.0.0d0, 3.0.1, 3.1.0
CPE
External links
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-2
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.
