UBUNTU-CVE-2018-20023

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    UBUNTU-CVE-2018-20023

    Published: 19 Dec 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-20023

    Summary:

    Details: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR

    References: https://ubuntu.com/security/CVE-2018-20023, https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/, https://ubuntu.com/security/notices/USN-3877-1, https://ubuntu.com/security/notices/USN-4547-1, https://www.cve.org/CVERecord?id=CVE-2018-20023, https://ubuntu.com/security/notices/USN-4587-1

    Affected packages

    Package

    Name: libvncserver

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-1ubuntu1.4?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.9.9+dfsg-1ubuntu1.4

    Affected versions

    0.9.9+dfsg-1
    0.9.9+dfsg-1ubuntu1
    0.9.9+dfsg-1ubuntu1.1
    0.9.9+dfsg-1ubuntu1.2
    0.9.9+dfsg-1ubuntu1.3

    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