UBUNTU-CVE-2020-10932 (CVE-2020-10932)

Vulnerability from osv_ubuntu – Published: 2020-04-15 14:15 – Updated: 2026-04-22 07:39 – Source website
VLAI
Details

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.

Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmbedcrypto0",
            "binary_version": "2.2.1-2ubuntu0.3"
          },
          {
            "binary_name": "libmbedtls10",
            "binary_version": "2.2.1-2ubuntu0.3"
          },
          {
            "binary_name": "libmbedx509-0",
            "binary_version": "2.2.1-2ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "mbedtls",
        "purl": "pkg:deb/ubuntu/mbedtls@2.2.1-2ubuntu0.3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.2-1",
        "2.2.0-1",
        "2.2.1-1",
        "2.2.1-2",
        "2.2.1-2ubuntu0.1",
        "2.2.1-2ubuntu0.2",
        "2.2.1-2ubuntu0.3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmbedcrypto1",
            "binary_version": "2.8.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libmbedtls10",
            "binary_version": "2.8.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libmbedx509-0",
            "binary_version": "2.8.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "mbedtls",
        "purl": "pkg:deb/ubuntu/mbedtls@2.8.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.1-1ubuntu1",
        "2.6.0-1",
        "2.7.0-2",
        "2.8.0-1",
        "2.8.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmbedcrypto3",
            "binary_version": "2.16.4-1ubuntu2+esm1"
          },
          {
            "binary_name": "libmbedtls12",
            "binary_version": "2.16.4-1ubuntu2+esm1"
          },
          {
            "binary_name": "libmbedx509-0",
            "binary_version": "2.16.4-1ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "mbedtls",
        "purl": "pkg:deb/ubuntu/mbedtls@2.16.4-1ubuntu2+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.16.2-1",
        "2.16.3-1",
        "2.16.4-1ubuntu2",
        "2.16.4-1ubuntu2+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2020-10932",
  "modified": "2026-04-22T07:39:21Z",
  "published": "2020-04-15T14:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-10932"
    },
    {
      "type": "REPORT",
      "url": "https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released"
    },
    {
      "type": "REPORT",
      "url": "https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04"
    },
    {
      "type": "REPORT",
      "url": "https://tls.mbed.org/tech-updates/security-advisories"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-10932"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-10932"
  ]
}



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