UBUNTU-CVE-2023-24021

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    UBUNTU-CVE-2023-24021

    Published: 20 Jan 2023Last Modified: 4 Feb 2026
    Upstream:
    CVE-2023-24021
    Aliases:
    USN-6370-1

    Summary:

    Details: Incorrect handling of '\0' bytes in file uploads in ModSecurity before 2.9.7 may allow for Web Application Firewall bypasses and buffer over-reads on the Web Application Firewall when executing rules that read the FILES_TMP_CONTENT collection.

    References: https://ubuntu.com/security/CVE-2023-24021, https://github.com/SpiderLabs/ModSecurity/pull/2857, https://github.com/SpiderLabs/ModSecurity/commit/4324f0ac59f8225aa44bc5034df60dbeccd1d334, https://github.com/SpiderLabs/ModSecurity/pull/2857/commits/4324f0ac59f8225aa44bc5034df60dbeccd1d334, https://github.com/SpiderLabs/ModSecurity/releases/tag/v2.9.7, https://ubuntu.com/security/notices/USN-6370-1, https://www.cve.org/CVERecord?id=CVE-2023-24021

    Affected packages

    Package

    Name: modsecurity-apache

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.9.0-1ubuntu0.1~esm1

    Affected versions

    2.9.0-1

    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-2023-24021 | CVE-DB