Side-channel attack on ECC key in Mbed TLS



Published: 2020-07-02
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID N/A
CWE-ID CWE-310
Exploitation vector Local
Public exploit N/A
Vulnerable software
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mbed TLS
Universal components / Libraries / Libraries used by multiple products

Vendor ARM

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Cryptographic issues

EUVDB-ID: #VU29447

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a local user to perform a side-channel attack.

The vulnerability exists due to missing randomization in the mbedtls_pk_parse_key(), mbedtls_pk_parse_keyfile(), mbedtls_ecp_check_pub_priv() and mbedtls_pk_check_pair() functions in Mbed TLS. A local user can perform a side-channel attack on ECC key import and fully recover the private key after collecting a single trace of any of the affected functions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

mbed TLS: 2.0.0, 2.1.0 - 2.1.18, 2.2.0 - 2.2.1, 2.3.0, 2.4.0 - 2.4.2, 2.5.0 - 2.5.1, 2.6.0 - 2.6.1, 2.7.0 - 2.7.15, 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 - 2.16.6, 2.17.0, 2.18.0 - 2.18.1, 2.19.0 - 2.19.1, 2.20.0, 2.21.0, 2.22.0


CPE2.3 External links

http://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-07

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.



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