UBUNTU-CVE-2018-16851

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    UBUNTU-CVE-2018-16851

    Published: 27 Nov 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-16851

    Summary:

    Details: Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.

    References: https://ubuntu.com/security/CVE-2018-16851, https://www.samba.org/samba/security/CVE-2018-16851.html, https://ubuntu.com/security/notices/USN-3827-1, https://ubuntu.com/security/notices/USN-3827-2, https://www.cve.org/CVERecord?id=CVE-2018-16851

    Affected packages

    Package

    Name: samba

    Purl: pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.14.04.19?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:4.3.11+dfsg-0ubuntu0.14.04.19

    Affected versions

    2:3.6.18-1ubuntu3

    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