ubuntu-cve-2018-6594
Vulnerability from osv_ubuntu
Published
2018-02-03 00:00
Modified
2025-09-08 16:44
Summary
Details

lib/Crypto/PublicKey/ElGamal.py in PyCrypto through 2.6.1 generates weak ElGamal key parameters, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for PyCrypto's ElGamal implementation.

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-crypto",
            "binary_version": "2.6.1-4ubuntu0.3"
          },
          {
            "binary_name": "python3-crypto",
            "binary_version": "2.6.1-4ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "python-crypto",
        "purl": "pkg:deb/ubuntu/python-crypto@2.6.1-4ubuntu0.3?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.1-4ubuntu0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6-5",
        "2.6.1-2",
        "2.6.1-2build1",
        "2.6.1-3",
        "2.6.1-4",
        "2.6.1-4build1",
        "2.6.1-4ubuntu0.1",
        "2.6.1-4ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-crypto",
            "binary_version": "2.6.1-6ubuntu0.16.04.3"
          },
          {
            "binary_name": "python3-crypto",
            "binary_version": "2.6.1-6ubuntu0.16.04.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-crypto",
        "purl": "pkg:deb/ubuntu/python-crypto@2.6.1-6ubuntu0.16.04.3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.1-6ubuntu0.16.04.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.1-5build1",
        "2.6.1-6",
        "2.6.1-6build1",
        "2.6.1-6ubuntu0.16.04.1",
        "2.6.1-6ubuntu0.16.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-pycryptodome",
            "binary_version": "3.4.7-1ubuntu1"
          },
          {
            "binary_name": "python3-pycryptodome",
            "binary_version": "3.4.7-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "pycryptodome",
        "purl": "pkg:deb/ubuntu/pycryptodome@3.4.7-1ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.7-1ubuntu1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.6-1",
        "3.4.7-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-crypto",
            "binary_version": "2.6.1-8ubuntu2"
          },
          {
            "binary_name": "python3-crypto",
            "binary_version": "2.6.1-8ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-crypto",
        "purl": "pkg:deb/ubuntu/python-crypto@2.6.1-8ubuntu2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.1-8ubuntu2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.1-7build2",
        "2.6.1-8"
      ]
    }
  ],
  "aliases": [],
  "details": "lib/Crypto/PublicKey/ElGamal.py in PyCrypto through 2.6.1 generates weak ElGamal key parameters, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for PyCrypto\u0027s ElGamal implementation.",
  "id": "UBUNTU-CVE-2018-6594",
  "modified": "2025-09-08T16:44:46Z",
  "published": "2018-02-03T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-6594"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/TElgamal/attack-on-pycrypto-elgamal"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3616-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3616-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2018-6594"
    }
  ],
  "related": [
    "USN-3616-1",
    "USN-3616-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2018-6594"
  ]
}



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