UBUNTU-CVE-2023-46728

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    UBUNTU-CVE-2023-46728

    Published: 6 Nov 2023Last Modified: 4 Feb 2026
    Upstream:
    CVE-2023-46728

    Summary:

    Details: Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this bug are possible to be received from any gopher server, even those without malicious intent. Gopher support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should reject all gopher URL requests.

    References: https://ubuntu.com/security/CVE-2023-46728, https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f, https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html, https://ubuntu.com/security/notices/USN-6500-1, https://ubuntu.com/security/notices/USN-6500-2, https://www.cve.org/CVERecord?id=CVE-2023-46728

    Affected packages

    Package

    Name: squid3

    Purl: pkg:deb/ubuntu/[email protected]+esm2?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.5.12-1ubuntu7.16+esm2

    Affected versions

    3.3.8-1ubuntu16
    3.3.8-1ubuntu17

    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-2023-46728 | CVE-DB