UBUNTU-CVE-2018-20217

    Dashboard / Vulnerabilities / UBUNTU-CVE-2018-20217

    UBUNTU-CVE-2018-20217

    Published: 26 Dec 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-20217
    Aliases:
    USN-5828-1

    Summary:

    Details: A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.

    References: https://ubuntu.com/security/CVE-2018-20217, https://lists.fedoraproject.org/archives/list/[email protected]/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/, https://ubuntu.com/security/notices/USN-5828-1, https://www.cve.org/CVERecord?id=CVE-2018-20217

    Affected packages

    Package

    Name: krb5

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-2ubuntu5.4+esm1?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.12+dfsg-2ubuntu5.4+esm1

    Affected versions

    1.10.1+dfsg-6.1ubuntu1

    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-2018-20217 | CVE-DB