CVE-2020-10932 Information disclosure in n/a
An attacker with side-channel access can recover ECDSA private keys from Mbed TLS, compromising cryptographic security.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-10932?
CVE-2020-10932 is a medium-severity vulnerability in Arm Mbed Tls, published on 15 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2020-10932?
It affects 4 products.
Linux distribution packages (2)
mbedtls SUSE:Package Hub 15 SP2 | All versions | 2.16.9-bp152.2.3.1 |
mbedtls openSUSE:Leap 15.2 | All versions | 2.16.9-lp152.2.3.1 |
Products include Arm Mbed Tls, Debian Debian Linux, Fedoraproject Fedora, Trustedfirmware Mbed Tls.
How do I fix CVE-2020-10932?
Upgrade to a fixed version.
Is CVE-2020-10932 being exploited?
There is no known exploitation of CVE-2020-10932 in the wild and no public exploit code.
Other vulnerabilities in Arm Mbed Tls
Sources
Also known as ALPINE-CVE-2020-10932, DEBIAN-CVE-2020-10932, GHSA-fj9x-f2wx-v38w, JLSEC-2025-201, MGASA-2020-0265, UBUNTU-CVE-2020-10932 and 2 more.