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Security audit

Coresignal

Security checks for vulnerabilities and agentic risk

Overview

The Coresignal features fit their purpose, but setup directs the agent to run downloaded software without verification or a clear approval step.

Review and approve CLI installation separately before allowing the setup fallback, including any changes to installed agent skills. Prefer a fixed, independently verified release. Using the connector also means trusting OOMOL with Coresignal credentials and queries. The remote installers could not be retrieved, so their exact behavior remains unverified; the artifacts do not establish malicious intent.

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 only supplied operation executes a remote installer, with no visible connection to the declared Coresignal functionality. The code does not establish that this is a supporting dependency for that functionality. The installer's downstream actions cannot be determined from the supplied chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping the installer URL directly into bash executes mutable remote content without an opportunity to verify or review it first. A compromised hosting endpoint or installer supply chain could execute arbitrary commands, access local credentials, or modify files; HTTPS protects transport but does not establish that the script itself is trustworthy.

Content

Scanner excerpt · SKILL.md (reported line 57)May include surrounding context.

First-time setup instructs the agent to execute downloaded installer scripts without warning about system changes or remote-code execution.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The missing-CLI fallback directs the agent to install software by immediately executing downloaded shell or PowerShell content, without explicit approval or integrity verification. This expands a data-reading task into local code execution with the invoking user's privileges; the conditional trigger and declared tool restrictions limit reachability but do not make the installation instructions safe.

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 78)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