CVE-2020-10932
First published: Wed Apr 15 2020(Updated: )
An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reconstructing the projective coordinate of the result of scalar multiplication by exploiting side channels in the conversion to affine coordinates; (2) using an attack described by Naccache, Smart, and Stern in 2003 to recover a few bits of the ephemeral scalar from those projective coordinates via several measurements; and (3) using a lattice attack to get from there to the long-term ECDSA private key used for the signatures. Typically an attacker would have sufficient access when attacking an SGX enclave and controlling the untrusted OS.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ARM mbed TLS | >=2.7.0<2.7.15 | |
| ARM mbed TLS | >=2.16.0<2.16.6 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 | |
| Debian Debian Linux | =10.0 |
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Reference Links
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/
- https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released
- https://tls.mbed.org/tech-updates/security-advisories
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2020-10932.
What is the severity of CVE-2020-10932?
The severity of CVE-2020-10932 is medium with a CVSS score of 4.7.
Which products are affected by CVE-2020-10932?
The ARM Mbed TLS versions 2.7.0 to 2.7.15 and 2.16.0 to 2.16.6 are affected by CVE-2020-10932.
How can an attacker exploit CVE-2020-10932?
An attacker can exploit CVE-2020-10932 by getting precise enough side-channel measurements to recover the long-term ECDSA private key by exploiting side channels.
Are there any fixes or patches available for CVE-2020-10932?
Yes, patches and updates are available for the affected versions of ARM Mbed TLS. Please refer to the vendor's website for the appropriate patch or update.
- collector/nvd-index
- agent/weakness
- agent/references
- agent/author
- agent/severity
- agent/type
- agent/description
- agent/event
- agent/softwarecombine
- agent/first-publish-date
- agent/last-modified-date
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/arm
- canonical/arm mbed tls
- version/arm mbed tls/2.7.0
- version/arm mbed tls/2.16.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/31
- version/fedoraproject fedora/32
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/10.0