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Security audit

Glyphic

Security checks for vulnerabilities and agentic risk

Overview

The Glyphic reads fit the skill’s purpose, but setup directs the agent to execute unverified remote installers without separate user approval.

Review and approve CLI installation separately before allowing the fallback to run. Prefer a verified, fixed release, and review or disable the CLI’s automatic agent-skill synchronization. Connecting Glyphic permits OOMOL-mediated access to call content. The remote installer contents remain unverified; no malicious behavior was established in the bundled artifact.

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
96% confidence
Finding

The supplied code installs software from an unrelated service rather than performing the declared Glyphic data operations. Nothing in the supplied content establishes this installer as a supporting dependency for Glyphic. The downloaded script is not supplied, so its additional behavior cannot be determined.

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 checking a pinned version, signature, or independently trusted digest; the PowerShell alternative has the same issue. Compromise of the installer endpoint or distribution infrastructure could result in arbitrary code execution with the user's permissions, despite the legitimate dependency-installation purpose.

Content

Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

Fallback setup executes downloaded installation scripts without warning about remote code execution or system changes.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The missing-CLI fallback instructs the agent to execute downloaded installers without explicit approval for local software installation or disclosure of potential system changes. Although conditional and relevant to the workflow, this expands a read-only Glyphic request into execution of installation code with the invoking user's permissions.

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 84)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