UBUNTU-CVE-2018-20843

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    UBUNTU-CVE-2018-20843

    Published: 24 Jun 2019Last Modified: 28 May 2026
    Upstream:
    CVE-2018-20843
    Aliases:
    USN-4040-1
    USN-4040-2
    USN-4852-1

    Summary:

    Details: In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

    References: https://ubuntu.com/security/CVE-2018-20843, https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226, https://github.com/libexpat/libexpat/pull/262, https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes, https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6, https://ubuntu.com/security/notices/USN-4040-1, https://ubuntu.com/security/notices/USN-4040-2, https://ubuntu.com/security/notices/USN-5455-1, https://ubuntu.com/security/notices/USN-4852-1, https://www.cve.org/CVERecord?id=CVE-2018-20843, https://ubuntu.com/security/notices/USN-7199-1

    Affected packages

    Package

    Name: expat

    Purl: pkg:deb/ubuntu/expat?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.1.0-4ubuntu1.4+esm1

    Affected versions

    2.1.0-4
    2.1.0-4ubuntu1
    2.1.0-4ubuntu1.1
    2.1.0-4ubuntu1.2
    2.1.0-4ubuntu1.3
    2.1.0-4ubuntu1.4

    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-2018-20843 | CVE-DB