UBUNTU-CVE-2018-6594

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    UBUNTU-CVE-2018-6594

    Published: 3 Feb 2018Last Modified: 4 Feb 2026
    Upstream:
    CVE-2018-6594

    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.

    References: https://ubuntu.com/security/CVE-2018-6594, https://github.com/TElgamal/attack-on-pycrypto-elgamal, https://ubuntu.com/security/notices/USN-3616-1, https://ubuntu.com/security/notices/USN-3616-2, https://www.cve.org/CVERecord?id=CVE-2018-6594

    Affected packages

    Package

    Name: python-crypto

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.6.1-4ubuntu0.3

    Affected versions

    2.6-5

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High