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Security audit

BoldSign

Security checks for vulnerabilities and agentic risk

Overview

The BoldSign workflow is coherent, but setup executes unverified remote installers without clear approval and omits broader changes the CLI can make to agent skills.

Review and approve CLI installation separately before allowing setup. Prefer a pinned, verified release, and review or disable automatic skill synchronization across your agents. OOMOL mediates access to your connected BoldSign account. The complete bundled artifact was inspected, but the remote installers and exact installed runtime were not verified.

Vulnerability Patterns
  • 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
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs remote script execution rather than any visible BoldSign operation. Nothing in the supplied chunk establishes that the Oomol installer is a supporting dependency for BoldSign, making its installation materially inconsistent with the declared purpose. The downloaded script's further behavior cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping an HTTPS response directly into Bash executes mutable remote code without a pinned version or independent integrity verification. Compromise of the installer endpoint or release infrastructure could execute attacker-controlled code with the agent process's privileges; the legitimate OOMOL dependency and missing-CLI condition narrow exposure but do not remove this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning about local code execution and system changes.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The missing-CLI fallback directs the agent to execute an installer without first explaining local code execution or requesting approval for system changes. Although installation is a legitimate prerequisite, authorization to perform a BoldSign task does not necessarily authorize installing software; this fallback can cross that boundary if the Bash permission layer permits it.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 81)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources