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Use of a Broken or Risky Cryptographic Algorithm The advisory has been revoked - it doesn't affect any version of package mbedtls  (opens in a new tab)

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EPSS
0.25% (17th percentile)

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  • Snyk IDSNYK-UBUNTU1604-MBEDTLS-1148161
  • published21 Mar 2026
  • disclosed15 Apr 2020
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Introduced: 15 Apr 2020

CVE-2020-10932  (opens in a new tab)
CWE-327  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mbedtls package and not the mbedtls package as distributed by Ubuntu.

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.

References