Local side channel attacks in Mbed TLS
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | N/A |
| CWE-ID | CWE-208 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
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 information about 2 vulnerabilities.
1) Local side channel attack
EUVDB-ID: #VU54628
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: N/A
CWE-ID:
CWE-208 - Information Exposure Through Timing Discrepancy
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsmbed TLS: 1.3.0 - 2.26.0
mbed Crypto: 0.1.0a - 3.1.0
External linkshttp://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.
2) Local side channel attack
EUVDB-ID: #VU54627
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: N/A
CWE-ID:
CWE-208 - Information Exposure Through Timing Discrepancy
Exploit availability: No
DescriptionThe 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 (typically an untrusted operating system attacking a secure enclave such as SGX or the TrustZone secure world) can recover the private keys used in RSA.
MitigationInstall updates from vendor's website.
Vulnerable software versionsmbed TLS: 1.3.0 - 2.26.0
External linkshttp://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1
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.
