CVE-2018-20102

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    CVE-2018-20102

    Published: 12 Dec 2018Last Modified: 15 Mar 2026

    Summary:

    Details: An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.

    References: http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=efbbdf72992cd20458259962346044cafd9331c0, https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html, http://www.securityfocus.com/bid/106223, https://access.redhat.com/errata/RHBA-2019:0326, https://access.redhat.com/errata/RHBA-2019:0327, https://access.redhat.com/errata/RHSA-2019:1436, https://usn.ubuntu.com/3858-1/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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