UBUNTU-CVE-2017-20002

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    UBUNTU-CVE-2017-20002

    Published: 17 Mar 2021Last Modified: 16 Jul 2025
    Upstream:
    CVE-2017-20002

    Summary:

    Details: The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty. This allows local users to login as password-less users even if they are connected by non-physical means such as SSH (hence bypassing PAM's nullok_secure configuration). This notably affects environments such as virtual machines automatically generated with a default blank root password, allowing all local users to escalate privileges.

    References: https://ubuntu.com/security/CVE-2017-20002, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957, https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html, https://www.cve.org/CVERecord?id=CVE-2017-20002

    Affected packages

    Package

    Name: shadow

    Purl: pkg:deb/ubuntu/shadow@1:4.2-3.1ubuntu5.4?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:4.2-3.1ubuntu5.4

    Affected versions

    1:4.1.5.1-1.1ubuntu7

    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
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