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Security audit

Coda

Security checks for vulnerabilities and agentic risk

Overview

The Coda workflow has sensible controls, but its setup instructions can trigger unverified remote code execution without a separate approval step.

Review the CLI installation before allowing this skill to perform setup. Install a verified, version-specific release separately and require approval for additional local changes. Connecting Coda entrusts OOMOL with the integration credentials and requested data. Keep the skill's confirmation requirements for Coda writes. The installer payloads were unavailable for inspection; no malicious behavior was established.

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
95% confidence
Finding

The supplied chunk performs remote installer execution rather than Coda data operations. Although installing tooling can be a supporting implementation detail, the supplied content does not establish that this installer supports Coda. The remote script's contents and any resulting system changes are not visible, so no more specific behavior can be confirmed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a mutable HTTPS installer directly into bash executes the remote response with the agent process's local privileges, without integrity verification or an opportunity to inspect it. Compromise of the distribution endpoint could expose local files and credentials or modify the system; the legitimate vendor domain and missing-CLI prerequisite reduce suspicion of malicious intent but do not remove the supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 65)May include surrounding context.

The setup workflow instructs execution of downloaded installer scripts without warning about system changes or remote-code execution.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs the agent to install software by immediately executing downloaded scripts, without requiring explicit approval for local system changes or reviewing the installer. Although setup is relevant and only triggered when the CLI is missing, an ordinary Coda request can thereby lead to local code execution outside the requested data operation.

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 86)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