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Security audit

Census Notice Voice Pack

Security checks for vulnerabilities and agentic risk

Overview

The skill is mostly a disclosed Beatra voice-generation workflow, but it asks for much broader account powers and silently self-updates its executable files.

Review before installing. This skill should only be used if you are comfortable granting a shared Beatra device token that can do more than census voice generation, including other media-generation scopes and credit-spending operations. Consider disabling automatic updates with the documented update command and use a Beatra account where this broad authority is acceptable.

Vulnerability Patterns
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
Findings (2)

T05 · Unauthorized Access and Privilege Escalation

Error
Location
scripts/authorize.py:34
Finding

Overprivileged Shared Bearer Token and Unrestricted MCP Tool Invocation

Content
View full analysis
dict[str, Any]: session = _session_with_registration( state_dir=Path.home() / ".beatra", post_json=_default_post_json, ) if command == "tools": return session.request(2, "tools/list", {}) try: arguments = json.load(os.sys.stdin) except json.JSONDecodeError as exc: raise RuntimeError("Tool arguments on stdin must be one JSON object") from exc if not isinstance(arguments, dict): raise RuntimeError("Tool arguments on stdin must be one JSON object") assert tool_name is not None return session.request( 2, "tools/call", {"name": tool_name, "arguments": arguments}, ) ``` ### Technical Analysis The declared functionality is creating census-notice voice clips, optionally cloning an authorized voice sample, uploading that sample, and reading the resulting tasks and artifacts. The authorization request nevertheless includes unrelated capabilities for image, video, and music generation, broad voice-writing access, wallet spending, and task cancellation. This violates least privilege. The issue is amplified because `mcp_client.py` does not restrict `tool_name` to operations required by the Skill. Any process or agent action able to invoke the bundled client can request an arbitrary server-exposed MCP tool, subject only to the broad permissions attached to the sha ...[truncated 2085 chars]
Remediation
View remediation

T03 · Remote Payload Retrieval and Execution

Warning
Location
scripts/mcp_client.py:969
Finding

Silent Remote Replacement of Executable Skill Files Without Cryptographic Release Signatures

Content
View full analysis
bool: """Best-effort silent update. Never block the requested MCP command.""" resolved_state = state_dir or Path.home() / ".beatra" try: resolved_root = (install_root or _current_install_root()).resolve() update_home = _update_home(resolved_state, resolved_root) observed_at = time.time() if now is None else now nonce = _lock_update(update_home, now=observed_at) if nonce is None: return False try: recover_update(state_dir=resolved_state, install_root=resolved_root) state = _read_update_state(update_home) if state.get("auto_update", True) is False: return False last_checked = state.get("last_checked_at") if ( isinstance(last_checked, (int, float)) and observed_at - float(last_checked) < UPDATE_CHECK_MAX_AGE_SECONDS ): return False state["last_checked_at"] = observed_at _write_private_json(update_home / "state.json", state) checked = check_update(get_bytes=get_bytes) if not checked["update_available"]: return False _ensure_owned_baseline( install_root=resolved_root, update_home=update_home, get_bytes=get_bytes, ) discovery = checked["discovery"] manifest, new_files = download_update(discovery, get_bytes=get_bytes) _apply_update( install_root=resolved_root ...[truncated 3501 chars]
Remediation
View remediation
Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Rogue AgentSelf-Modification, Session Persistence
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
Findings (43)

Context-Inappropriate Capability

Critical
Category
Not specified by scanner
Confidence
99% confidence
Finding

The skill asks for image, video, and music generation permissions even though its description is limited to producing census notice voice clips. These excess capabilities expand the blast radius of the token and enable unauthorized content generation or resource consumption unrelated to the advertised function.

Content

No source excerpt is available for this finding.

Tp4

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The references indicate the package can also participate in uninstall/disconnect flows that inspect installed packages, modify local state under ~/.beatra, and revoke remote tokens—behavior far outside a user’s likely expectation for a voice-pack skill. Hidden or bundled lifecycle management logic is risky because it enables broader system and account changes under the guise of a narrow content-production tool.

Content

No source excerpt is available for this finding.

Tp4

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The references indicate the package can also participate in uninstall/disconnect flows that inspect installed packages, modify local state under ~/.beatra, and revoke remote tokens—behavior far outside a user’s likely expectation for a voice-pack skill. Hidden or bundled lifecycle management logic is risky because it enables broader system and account changes under the guise of a narrow content-production tool.

Content

No source excerpt is available for this finding.

Tp4

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The references indicate the package can also participate in uninstall/disconnect flows that inspect installed packages, modify local state under ~/.beatra, and revoke remote tokens—behavior far outside a user’s likely expectation for a voice-pack skill. Hidden or bundled lifecycle management logic is risky because it enables broader system and account changes under the guise of a narrow content-production tool.

Content

No source excerpt is available for this finding.

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 71)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 115)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 136)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 140)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 148)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 200)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 201)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 202)May include surrounding context.

md
(`scripts/mcp_client.py` / `beatra.assets.upload`). Keep the returned

Credential Access

High
Category
Privilege Escalation
Confidence
97% confidence
Finding

The manifest explicitly references a local credentials file, which is a sensitive secret source. Even if intended for legitimate service access, exposing a path to persistent credentials in a skill whose stated purpose does not require secret handling creates a concrete credential-access risk: a compromised or overprivileged skill can leverage those credentials to authenticate as the user to external services.

Content

Scanner excerpt · manifest.json (reported line 53)May include surrounding context.

json
},
  "mcp": {
    "authentication": "device-bearer",
    "credential_file": "~/.beatra/credentials.json",
    "name": "beatra",
    "transport": "streamable-http",
    "url": "https://mcp.beatra.ai/mcp"

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · references/installation-and-auth.md (reported line 14)May include surrounding context.

text

They share the one full-scope Device Token stored in
`~/.beatra/credentials.json`. Installing or switching packages must not trigger
another authorization when that credential is already valid. Do not add,
enable, trust, or configure a host Beatra Connector. Never print or move the
token into command arguments, environment variables, logs, chat, or another

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · references/installation-and-auth.md (reported line 21)May include surrounding context.

text

They share the one full-scope Device Token stored in
`~/.beatra/credentials.json`. Installing or switching packages must not trigger
another authorization when that credential is already valid. Do not add,
enable, trust, or configure a host Beatra Connector. Never print or move the
token into command arguments, environment variables, logs, chat, or another

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · references/installation-and-auth.md (reported line 49)May include surrounding context.

text

They share the one full-scope Device Token stored in
`~/.beatra/credentials.json`. Installing or switching packages must not trigger
another authorization when that credential is already valid. Do not add,
enable, trust, or configure a host Beatra Connector. Never print or move the
token into command arguments, environment variables, logs, chat, or another

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · references/mcp-connection.md (reported line 10)May include surrounding context.

text

They share the one full-scope Device Token stored in
`~/.beatra/credentials.json`. Installing or switching packages must not trigger
another authorization when that credential is already valid. Do not add,
enable, trust, or configure a host Beatra Connector. Never print or move the
token into command arguments, environment variables, logs, chat, or another

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · scripts/authorize.py (reported line 207)May include surrounding context.

python
```

They share the one full-scope Device Token stored in
`~/.beatra/credentials.json`. Installing or switching packages must not trigger
another authorization when that credential is already valid. Do not add,
enable, trust, or configure a host Beatra Connector. Never print or move the
token into command arguments, environment variables, logs, chat, or another

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · scripts/authorize.py (reported line 514)May include surrounding context.

python
```

They share the one full-scope Device Token stored in
`~/.beatra/credentials.json`. Installing or switching packages must not trigger
another authorization when that credential is already valid. Do not add,
enable, trust, or configure a host Beatra Connector. Never print or move the
token into command arguments, environment variables, logs, chat, or another

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · scripts/mcp_client.py (reported line 1025)May include surrounding context.

python
```

They share the one full-scope Device Token stored in
`~/.beatra/credentials.json`. Installing or switching packages must not trigger
another authorization when that credential is already valid. Do not add,
enable, trust, or configure a host Beatra Connector. Never print or move the
token into command arguments, environment variables, logs, chat, or another

Description-Behavior Mismatch

High
Category
Not specified by scanner
Confidence
99% confidence
Finding

The requested OAuth scope bundle is far broader than the skill’s stated purpose of producing census notice voice clips. Granting artifacts, image/video/music generation, task control, voice management, and other account-level permissions violates least privilege and would let a compromised or repurposed skill act far outside expected voice-pack creation.

Content

No source excerpt is available for this finding.

Context-Inappropriate Capability

High
Category
Not specified by scanner
Confidence
99% confidence
Finding

The skill asks for image, video, and music generation permissions even though its description is limited to producing census notice voice clips. These excess capabilities expand the blast radius of the token and enable unauthorized content generation or resource consumption unrelated to the advertised function.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
Not specified by scanner
Confidence
98% confidence
Finding

The client includes a full self-update and installation-file replacement mechanism even though the skill is presented as a census voice-pack generator. Although the updater performs multiple integrity checks, it still grants the package the ability to rewrite its own installed codebase, which materially expands the trust boundary and creates a software supply-chain and persistence risk if the update channel, signing process, or upstream account is ever compromised.

Content

No source excerpt is available for this finding.

Self-Modification

High
Category
Rogue Agent
Confidence
95% confidence
Finding

The exposed update command explicitly supports self-update behavior, and elsewhere the file implements code download, archive validation, and replacement of package files in-place. A voice-generation skill having built-in self-modification is risky because it gives non-core functionality the ability to persistently alter executable code, magnifying the consequences of backend, CDN, or release-process compromise.

Content

Scanner excerpt · scripts/mcp_client.py (reported line 1503)May include surrounding context.

python
)
    update = subparsers.add_parser(
        "update",
        help="Check, install, or configure Beatra package self-updates",
    )
    update.add_argument(
        "--check",

Description-Behavior Mismatch

High
Category
Not specified by scanner
Confidence
98% confidence
Finding

The uninstall script manages a shared device credential in ~/.beatra and can revoke remote authorization for the whole device account, which is materially broader than the declared purpose of generating census notice voice clips. Even though the code is careful and appears intended to avoid breaking other skills, bundling cross-skill credential and authorization management into a narrow audio-production skill creates unnecessary authority and expands the blast radius if the skill or its packaging is misused.

Content

No source excerpt is available for this finding.