Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Aperion Shield

Works with:

Compatibility: Not stated.

Grade D

Two or more Medium findings, or a High finding. Only try it in a sandbox.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

Rescanned at commit b1cdc28f164e, unchanged since the check below.

INSTALL_REMOTE_SCRIPT OBFUSCATION_RUNS_ENCODED_PAYLOAD PERMISSION_SHELL_UNDECLARED SECRETS_PATH_CREDENTIAL

Why this grade

  • INSTALL_REMOTE_SCRIPT High

    Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).

    install.sh, line 4 # curl -fsSL https://shield-get.aperion.ai | sh

  • OBFUSCATION_RUNS_ENCODED_PAYLOAD High

    Decodes and runs an encoded payload (for example eval with atob or base64).

    src/scan/mod.rs, line 978 let ids = scan_str("x.js", "eval(atob(payload))");

  • PERMISSION_SHELL_UNDECLARED Medium

    Runs shell commands that the manifest or description does not mention.

    README.md, line 393 (fetch piped into `Invoke-Expression`), tier **Critical**.

  • SECRETS_PATH_CREDENTIAL Medium

    Mentions a credential store path (~/.ssh, id_rsa, .npmrc, .aws/credentials, credentials.json, .netrc).

    src/engine.rs, line 38 //! sensitive_paths: ['/etc/**', '~/.ssh/**', '~/.aws/**'] # NEW (v2)

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Concern

    requests shell access. No manifest field names shell or command execution.

    PERMISSION_SHELL_UNDECLARED

    README.md, line 393

    (fetch piped into `Invoke-Expression`), tier **Critical**.

    config/shieldset.yaml, line 953

    - '(?i)\b(Invoke-WebRequest|iwr|curl|wget|Invoke-RestMethod|irm)\b[^\n]*\|\s*(iex|Invoke-Expression)\b'

    config/shieldset.yaml, line 954

    - '(?i)\b(iex|Invoke-Expression)\s*\(\s*(New-Object\s+Net\.WebClient|Invoke-WebRequest|iwr|irm)\b'

    Show more

    config/shieldset.yaml, line 955

    reason: "PowerShell download-and-execute (fetch piped to Invoke-Expression) -- the Windows curl|sh."

  • Install and update

    Serious

    install fetches a script from the network. README documents an installer that pipes a download into a shell. The docs document an installer that pipes a download into a shell.

    INSTALL_REMOTE_SCRIPT INSTALL_DOCUMENTED_INSTALLER

    README.md, line 50

    project MCP + Skills, and `curl -fsSL https://shield-get.aperion.ai | sh`.

    README.md, line 73

    curl -fsSL https://shield-get.aperion.ai | sh

    install.sh, line 4

    # curl -fsSL https://shield-get.aperion.ai | sh

    Show more

    README.md, line 235

    3. **`curl | sh` install.** `curl -fsSL https://shield-get.aperion.ai | sh`

    README.md, line 241

    curl -fsSL https://shield-get.aperion.ai | sh

    README.md, line 810

    curl -fsSL https://shield-get.aperion.ai | sh

    install.sh, line 169

    echo " Shared box: SHIELD_INSTALL_DIR=/usr/local/bin sudo -E sh -c 'curl -fsSL https://shield-get.aperion.ai | sh'"

    docs/INSTALL.md, line 6

    curl -fsSL https://shield-get.aperion.ai | sh

    docs/INSTALL.md, line 14

    curl -fsSL https://shield-get.aperion.ai | sh

    docs/INSTALL.md, line 20

    curl -fsSL https://raw.githubusercontent.com/AperionAI/shield/main/install.sh | sh

    docs/INSTALL.md, line 52

    curl -fsSL https://shield-get.aperion.ai | sh

    docs/shieldset-as-code.md, line 239

    [allow -> approval] run_terminal: curl https://artifacts.corp/install.sh | sh

    src/predicates.rs, line 1046

    "curl -s https://x | bash -c 'cat > /tmp/out'"

  • Network

    Concern

    can reach a host that is not written as a fixed address. can reach api.github.com. The description does not name that host. can reach cluster1.aperion.ai. The description does not name that host. can reach .... The description does not name that host. can reach x. The description does not name that host. can reach example.com. The description does not name that host. can reach api.example. The description does not name that host. can reach x.example. The description does not name that host. can

    NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST

    install.sh, line 8

    # curl + tar + (shasum or sha256sum).

    install.sh, line 109

    json="$(curl -fsSL "https://api.github.com/repos/$REPO/releases/latest")" || err "couldn't resolve latest release"

    install.sh, line 123

    command -v curl >/dev/null 2>&1 || err "curl is required"

    Show more

    install.sh, line 135

    curl -fSL "$url" -o "$tmp/$asset" || err "download failed: $url"

    install.sh, line 137

    if curl -fSL "$url.sha256" -o "$tmp/$asset.sha256" 2>/dev/null; then

    src/engine.rs, line 1743

    let p = json!({"command": "curl -X DELETE https://cluster1.aperion.ai/api/policies/hipaa"});

    src/predicates.rs, line 26

    /// `curl ... | tee /tmp/x && sh /tmp/x`, and similar "trust-on-first-use"

    src/predicates.rs, line 32

    /// (`curl -d`, `wget --post-data`, `nc <host>`, an `http*://` argument

    src/predicates.rs, line 1326

    "curl http://localhost:7778/api/admin/quarantine"

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_CREDENTIAL SECRETS_PATH_DOTENV

    src/context.rs, line 96

    &policy_with_signals(&[".env.production", "prod/"]),

    src/context.rs, line 106

    fs::write(tmp.path().join(".env.production"), "DB=prod").unwrap();

    src/engine.rs, line 38

    //! sensitive_paths: ['/etc/**', '~/.ssh/**', '~/.aws/**'] # NEW (v2)

    Show more

    src/context.rs, line 108

    WorkspaceContext::probe_at(&policy_with_signals(&[".env.production"]), tmp.path());

    src/context.rs, line 110

    assert_eq!(ctx.matched_signals, vec![".env.production".to_string()]);

    src/context.rs, line 133

    fs::write(tmp.path().join(".env.production"), "x").unwrap();

    src/context.rs, line 134

    let mut p = policy_with_signals(&[".env.production"]);

    src/engine.rs, line 11

    //! prod_signals: [".env.production", "prod/", "Procfile"]

  • Agent instructions

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Serious

    runs an encoded payload.

    OBFUSCATION_RUNS_ENCODED_PAYLOAD

    src/scan/mod.rs, line 978

    let ids = scan_str("x.js", "eval(atob(payload))");

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

Get the full report on this tool, £49

Note

Hygiene check of commit b1cdc28f164e. requests shell access. No manifest field names shell or command execution. install fetches a script from the network. README documents an installer that pipes a download into a shell. The docs document an installer that pipes a download into a shell. can reach a host that is not written as a fixed address. can reach api.github.com. The description does not name that host. can reach cluster1.aperion.ai. The description does not name that host. can reach .... The description does not name that host. can reach x. The description does not name that host. can reach example.com. The description does not name that host. can reach api.example. The

Date and source

Date checked:

View source

github.com

Commit graded: b1cdc28f164e93704f6541b0a3cd6e065a800979

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen