Github is compomised accepted

THREAT50 · Accepted: The team has decided to live with this risk. · Defined in catalog.py:893

Risk: High impact × Low likelihood = 6 medium
After mitigations: High impact × Low likelihood = 6 medium (unchanged)

A resource adversary could compromise GitHub and modify SecureDrop source code and introduce vulnerabilities

Threat actors: Nation State / Law Enforcement

Mitigations

Mitigation	Status
All SecureDrop and tor releases (Release file and tag) signed with airgapped key MITIG46	implemented
Airgapped signing for release tags, public and controlled branches for development/release MITIG77	implemented
2FA required for SD maintainer GitHub accounts MITIG176	implemented
All code is reviewed prior to merge MITIG47	implemented
SecureDrop code is open source MITIG177	implemented

Residual risk

Remaining risk is accepted.

Where it applies

Applies to 1 component in 1 scenario.

SecureDrop source repository External Services

Supply chain and dependencies · SecureDrop source repository

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_Application_Server {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <<i>Application Server</i>>;
        ]

        component_App_Server_APT_NTP_DNS_Application_Server [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "App Server\nAPT/NTP/DNS";
            URL = "component_App_Server_APT_NTP_DNS.html";
            tooltip = "App Server APT/NTP/DNS";
            margin = 0.02;
        ]

        component_Source_Interface_Application_Server [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "Source Interface";
            URL = "component_Source_Interface.html";
            tooltip = "Source Interface";
            margin = 0.02;
        ]

    }

    subgraph cluster_boundary_External_Services {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <<i>External Services</i>>;
        ]

        component_FPF_apt_repository_External_Services [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "FPF apt\nrepository";
            URL = "component_FPF_apt_repository.html";
            tooltip = "FPF apt repository";
            margin = 0.02;
        ]

        component_SecureDrop_release___package_build_External_Services [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "SecureDrop\nrelease &\npackage build";
            URL = "component_SecureDrop_release___package_build.html";
            tooltip = "SecureDrop release & package build";
            margin = 0.02;
        ]

        component_SecureDrop_source_repository_External_Services [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "SecureDrop\nsource\nrepository";
            URL = "component_SecureDrop_source_repository.html";
            tooltip = "SecureDrop source repository";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

        component_Tor_software_External_Services [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "Tor software";
            URL = "component_Tor_software.html";
            tooltip = "Tor software";
            margin = 0.02;
        ]

        component_Ubuntu_apt_repository_External_Services [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "Ubuntu apt\nrepository";
            URL = "component_Ubuntu_apt_repository.html";
            tooltip = "Ubuntu apt repository";
            margin = 0.02;
        ]

    }

    component_SecureDrop_source_repository_External_Services -> component_SecureDrop_release___package_build_External_Services [        color = black;        fontcolor = black;        dir = forward;        label = "1. Build from source";    ]
    component_SecureDrop_release___package_build_External_Services -> component_FPF_apt_repository_External_Services [        color = black;        fontcolor = black;        dir = forward;        label = "2. Publish packages";    ]
    component_FPF_apt_repository_External_Services -> component_App_Server_APT_NTP_DNS_Application_Server [        color = black;        fontcolor = black;        dir = forward;        label = "3. Install / update";    ]
    component_Ubuntu_apt_repository_External_Services -> component_App_Server_APT_NTP_DNS_Application_Server [        color = black;        fontcolor = black;        dir = forward;        label = "4. Ubuntu\ndependencies";    ]
    component_Tor_software_External_Services -> component_Source_Interface_Application_Server [        color = black;        fontcolor = black;        dir = forward;        label = "5. Tor dependency";    ]
}

Notes

In scope: No. Existing mitigations: FPF Github org makes use of all of GitHub's security features: Signed code, signed releases (we sign the release tag with the airgap key) (MITIG46), develop (trunk for us) branch protection (MITIG77), 2-factor mandated (MITIG176), code owners, code reviews (MITIG47). External contributors and users may also audit the code (MITIG177). Automated test for mitigation: No.

How this threat is matched

Listed for these components. A boundary covers every component inside it.