UBUNTU-CVE-2023-49288

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    UBUNTU-CVE-2023-49288

    Published: 4 Dec 2023Last Modified: 4 Feb 2026
    Upstream:
    CVE-2023-49288

    Summary:

    Details: Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Configurations with "collapsed_forwarding off" or without a "collapsed_forwarding" directive are not vulnerable. This bug is fixed by Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should remove all collapsed_forwarding lines from their squid.conf.

    References: https://ubuntu.com/security/CVE-2023-49288, https://github.com/squid-cache/squid/security/advisories/GHSA-rj5h-46j6-q2g5, https://megamansec.github.io/Squid-Security-Audit/trace-uaf.html, https://ubuntu.com/security/notices/USN-6728-1, https://ubuntu.com/security/notices/USN-6728-2, https://www.cve.org/CVERecord?id=CVE-2023-49288, https://ubuntu.com/security/notices/USN-6728-3

    Affected packages

    Package

    Name: squid3

    Purl: pkg:deb/ubuntu/[email protected]+esm6?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    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-2023-49288 | CVE-DB