UBUNTU-CVE-2020-19861

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    UBUNTU-CVE-2020-19861

    Published: 21 Jan 2022Last Modified: 22 Apr 2026
    Upstream:
    CVE-2020-19861

    Summary:

    Details: When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the memcpy is copied, the 0xfe - ldns_rdf_size(salt_rdf) byte data can be copied, causing heap overflow information leakage.

    References: https://ubuntu.com/security/CVE-2020-19861, https://github.com/NLnetLabs/ldns/issues/51, https://github.com/NLnetLabs/ldns/commit/136ec420437041fe13f344a2053e774f9050cc38, https://ubuntu.com/security/notices/USN-5257-1, https://ubuntu.com/security/notices/USN-5257-2, https://www.cve.org/CVERecord?id=CVE-2020-19861

    Affected packages

    Package

    Name: ldns

    Purl: pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.6.17-8ubuntu0.1+esm1

    Affected versions

    1.6.17-5
    1.6.17-7
    1.6.17-8
    1.6.17-8ubuntu0.1

    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-2020-19861 | CVE-DB