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Security audit

Rewiser

Security checks for vulnerabilities and agentic risk

Overview

The Rewiser actions require confirmation, but the CLI dependency can make persistent changes to other agent apps that this skill does not explain.

Review and install the CLI separately before allowing setup. Check its cross-app skill synchronization; current documentation provides OO_SKILLS_SYNC_DISABLED=1 to disable startup synchronization. Connect only the intended Rewiser account and review each transaction payload. The remote installers and server-side implementation 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
98% confidence
Finding

The supplied command executes an Oomol installer, with no visible connection to Rewiser or its data operations. This is an undeclared capability involving an inconsistent resource, not an established supporting implementation detail. The downloaded script's contents are unavailable, so its additional behavior cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
99% confidence
Finding

Piping the HTTPS response directly into bash executes mutable remote content without verifying a pinned version, signature, or checksum. HTTPS protects transport but does not prevent a compromised vendor endpoint or publishing pipeline from delivering malicious code that could access local files and credentials; this is the same underlying installation risk identified by SQP-2, not a separate exploit chain.

Content

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

The setup workflow executes remotely downloaded installation scripts without warning the user about remote code execution.

Medium
Category
Output Handling
Confidence
97% confidence
Finding

The fallback setup instructs the agent to execute downloaded shell or PowerShell code without a separate approval step or artifact verification. If the installer delivery infrastructure is compromised, attacker-controlled code could run with the invoking account's permissions; limiting setup to a missing-CLI error reduces exposure but does not eliminate this risk.

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