CVE-2021-36647

Use of a Broken or Risky Cryptographic Algorithm in the function mbedtls_mpi_exp_mod() in lignum.c in Mbed TLS Mbed TLS all versions before 3.0.0, 2.27.0 or 2.16.11 allows attackers 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) to recover the private keys used in RSA.

CVSS v3 4.7 MEDIUM

4.7^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/ARMmbed/mbedtls/releases/	Third Party Advisory
https://kouzili.com/Load-Step.pdf	Third Party Advisory
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1	Vendor Advisory
https://github.com/ARMmbed/mbedtls/releases/	Third Party Advisory
https://kouzili.com/Load-Step.pdf	Third Party Advisory
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:arm:mbed_tls::::::::
	cpe:2.3:a:arm:mbed_tls::::::::
	cpe:2.3:a:arm:mbed_tls::::::::

History

21 Nov 2024, 06:13

Type	Values Removed	Values Added
Summary		(es) Uso de un algoritmo criptográfico roto o riesgoso en la función mbedtls_mpi_exp_mod() en lignum.c en Mbed TLS Mbed TLS todas las versiones anteriores a 3.0.0, 2.27.0 o 2.16.11 permite a los atacantes acceder a información de tiempo y acceso a memoria suficientemente precisa (normalmente un sistema operativo que no es de confianza que ataca un enclave seguro como SGX o el mundo seguro TrustZone) para recuperar las claves privadas utilizadas en RSA.
References	~~() https://github.com/ARMmbed/mbedtls/releases/ - Third Party Advisory~~	() https://github.com/ARMmbed/mbedtls/releases/ - Third Party Advisory
References	~~() https://kouzili.com/Load-Step.pdf - Third Party Advisory~~	() https://kouzili.com/Load-Step.pdf - Third Party Advisory
References	~~() https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 - Vendor Advisory~~	() https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 - Vendor Advisory

Information

Published : 2023-01-17 21:15

Updated : 2024-11-21 06:13

NVD link : CVE-2021-36647

Mitre link : CVE-2021-36647

CVE.ORG link : CVE-2021-36647

JSON object : View

Products Affected

arm

mbed_tls

CWE

CWE-327

Use of a Broken or Risky Cryptographic Algorithm

4.7 /10