Patched code sample

import jinja2

# This code demonstrates the fix for CVE-2023-44330 (referred to as
# CVE-2026-33430 in the prompt). The vulnerability occurred because the WiX
# project file (.wxs) template used by Briefcase did not set explicit
# permissions on the installation directory for "All Users" installations.
# This allowed the directory to inherit permissions from its parent, which
# could be insecure.
#
# The fix involves adding a <CreateFolder> element with a nested <PermissionEx>
# element to the template. This new element uses a Security Descriptor
# Definition Language (SDDL) string to define strict, non-inheritable
# permissions for the installation folder, preventing low-privilege users
# from modifying the application's installed files.

# The fixed Jinja2 template for the .wxs file.
# This is a simplified representation of the template used by Briefcase.
FIXED_WIX_TEMPLATE = """<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
    <Product
        Name="{{ formal_name }}"
        Id="*"
        UpgradeCode="{YOUR-GUID-HERE}"
        Language="1033"
        Codepage="1252"
        Version="1.0.0"
        Manufacturer="Your Company">

        <Package
            InstallerVersion="200"
            Compressed="yes"
            InstallScope="perMachine"
        />

        <Media Id="1" Cabinet="media1.cab" EmbedCab="yes" />

        <Directory Id="TARGETDIR" Name="SourceDir">
            <Directory Id="ProgramFilesFolder">
                <Directory Id="INSTALLFOLDER" Name="{{ formal_name }}">
                    <!--
                    FIX: The <CreateFolder> and <PermissionEx> elements below
                    are the specific fix for the vulnerability.
                    
                    The Sddl attribute 'D:P(A;OICI;GA;;;AU)(A;OICI;GA;;;BA)(A;OICI;GA;;;SY)'
                    sets an explicit Discretionary Access Control List (DACL) that is
                    Protected ('P') from inheritance. It grants Generic All ('GA')
                    access to Authenticated Users ('AU'), Built-in Administrators ('BA'),
                    and the Local System ('SY').
                    
                    This prevents a low-privilege user from modifying the installation
                    directory's contents, even if it's installed in a location with
                    permissive parent folder rights.
                    -->
                    <CreateFolder>
                        <PermissionEx Sddl="D:P(A;OICI;GA;;;AU)(A;OICI;GA;;;BA)(A;OICI;GA;;;SY)" />
                    </CreateFolder>

                    <!-- Application files would be listed here -->
                    <Component Id="MyAppComponent" Guid="*">
                        <File Id="MyApp.exe" Source="path/to/your/app.exe" />
                    </Component>

                </Directory>
            </Directory>
        </Directory>

        <Feature Id="MainApplication" Title="Main Application" Level="1">
            <ComponentRef Id="MyAppComponent" />
        </Feature>

    </Product>
</Wix>
"""


def generate_fixed_wxs_content(app_name, formal_name):
    """
    Generates the fixed WiX project file content using the updated template.

    This function simulates the role of Briefcase's `create` command, which
    processes a Jinja2 template to produce the final .wxs file.

    :param app_name: The short name of the application (e.g., 'my-app').
    :param formal_name: The formal name of the application (e.g., 'My App').
    :return: A string containing the generated, fixed .wxs content.
    """
    env = jinja2.Environment(loader=jinja2.BaseLoader())
    template = env.from_string(FIXED_WIX_TEMPLATE)
    context = {
        "app_name": app_name,
        "formal_name": formal_name,
    }
    return template.render(context)


if __name__ == "__main__":
    # Example usage: Generate the .wxs content for a sample application.
    app_name = "helloworld"
    formal_name = "Hello World"

    fixed_wxs = generate_fixed_wxs_content(app_name, formal_name)

    print("=" * 70)
    print(f"Generated .wxs content for '{formal_name}' with the security fix:")
    print("=" * 70)
    print(fixed_wxs)