UBUNTU-CVE-2016-9243

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    UBUNTU-CVE-2016-9243

    Published: 9 Nov 2016Last Modified: 4 Feb 2026
    Upstream:
    CVE-2016-9243
    Aliases:
    USN-3138-1

    Summary:

    Details: HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.

    References: https://ubuntu.com/security/CVE-2016-9243, http://www.openwall.com/lists/oss-security/2016/11/08/6, https://ubuntu.com/security/notices/USN-3138-1, https://www.cve.org/CVERecord?id=CVE-2016-9243

    Affected packages

    Package

    Name: python-cryptography

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.2.3-1ubuntu0.1

    Affected versions

    1.0.1-1ubuntu1
    1.0.2-1

    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
    UBUNTU-CVE-2016-9243 | CVE-DB