UBUNTU-CVE-2021-22903

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    UBUNTU-CVE-2021-22903

    Published: 11 Jun 2021Last Modified: 20 May 2026
    Upstream:
    CVE-2021-22903

    Summary:

    Details: The actionpack ruby gem before 6.1.3.2 suffers from a possible open redirect vulnerability. Specially crafted Host headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts << "sub.example.com"` to permit a request with a Host header value of `sub-example.com`.

    References: https://ubuntu.com/security/CVE-2021-22903, https://www.cve.org/CVERecord?id=CVE-2021-22903

    Affected packages

    Package

    Name: rails

    Purl: pkg:deb/ubuntu/rails?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2:4.1.10-1

    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
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