Upstream information

CVE-2020-10932 at MITRE

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.

SUSE information

Overall state of this security issue: Does not affect SUSE products

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 1.9
Vector AV:L/AC:M/Au:N/C:P/I:N/A:N
Access Vector Local
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
CVSS v3 Scores
  National Vulnerability Database
Base Score 5.5
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Access Vector Local
Access Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact None
Availability Impact None
CVSSv3 Version 3.1
SUSE Bugzilla entry: 1181468 [RESOLVED / FIXED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Package Hub for SUSE Linux Enterprise 15 SP2
  • libmbedcrypto3 >= 2.16.9-bp152.2.3.1
  • libmbedcrypto3-64bit >= 2.16.9-bp152.2.3.1
  • libmbedtls12 >= 2.16.9-bp152.2.3.1
  • libmbedtls12-64bit >= 2.16.9-bp152.2.3.1
  • libmbedx509-0 >= 2.16.9-bp152.2.3.1
  • libmbedx509-0-64bit >= 2.16.9-bp152.2.3.1
  • mbedtls-devel >= 2.16.9-bp152.2.3.1
Patchnames:
openSUSE-2021-397
openSUSE Leap 15.2
  • libmbedcrypto3 >= 2.16.9-lp152.2.3.1
  • libmbedcrypto3-32bit >= 2.16.9-lp152.2.3.1
  • libmbedcrypto3-32bit-debuginfo >= 2.16.9-lp152.2.3.1
  • libmbedcrypto3-debuginfo >= 2.16.9-lp152.2.3.1
  • libmbedtls12 >= 2.16.9-lp152.2.3.1
  • libmbedtls12-32bit >= 2.16.9-lp152.2.3.1
  • libmbedtls12-32bit-debuginfo >= 2.16.9-lp152.2.3.1
  • libmbedtls12-debuginfo >= 2.16.9-lp152.2.3.1
  • libmbedx509-0 >= 2.16.9-lp152.2.3.1
  • libmbedx509-0-32bit >= 2.16.9-lp152.2.3.1
  • libmbedx509-0-32bit-debuginfo >= 2.16.9-lp152.2.3.1
  • libmbedx509-0-debuginfo >= 2.16.9-lp152.2.3.1
  • mbedtls-debugsource >= 2.16.9-lp152.2.3.1
  • mbedtls-devel >= 2.16.9-lp152.2.3.1
Patchnames:
openSUSE-2021-384