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Security audit

code-to-images

Security checks for vulnerabilities and agentic risk

Overview

The skill performs the disclosed local code-to-image and PDF conversion, with ordinary dependency and output-file precautions.

Select only files you intend to copy into images and PDFs, keep sensitive outputs private, and use trusted filenames without markup characters. Existing matching outputs may be overwritten. Prefer isolated dependency installations and trusted Node paths. Manual review addressed the scanner's material coverage gaps; conversion was not executed and downloaded dependencies remain outside this inspection.

A.I.G

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

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Behavioral ASTexec() Call, eval() Call, Dynamic Import
  • Taint TrackingDirect Taint Flow, Variable-Mediated Taint Flow, Credential Exfiltration Chain
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (6)

Ae4

Medium
Category
analysis-evasion
Confidence
80% confidence
Finding

Suspicious Unicode normalization or mixed-script content

Content

No source excerpt is available for this finding.

Ae4

Medium
Category
analysis-evasion
Confidence
80% confidence
Finding

Suspicious Unicode normalization or mixed-script content

Content

No source excerpt is available for this finding.

Skill declares no tool scope ('permissions' or 'allowed-tools') but code capabilities were detected: env, file_read, shell.

Medium
Category
MCP Least Privilege
Confidence
70% confidence
Finding

Without declared permissions the skill's intent is opaque and cannot be validated.

Content

No source excerpt is available for this finding.

Ae4

Medium
Category
analysis-evasion
Confidence
80% confidence
Finding

Suspicious Unicode normalization or mixed-script content

Content

No source excerpt is available for this finding.

subprocess module call

Medium
Category
Dangerous Code Execution
Confidence
70% confidence
Finding

subprocess module calls execute external commands. Without careful input validation, this enables command injection.

Content

Scanner excerpt · gen_code_pdfs.py (reported line 1167)May include surrounding context.

python
'try{const d=fs.readFileSync(s,"utf8");const r=new Resvg(d,{background:"#ffffff"});'
          'const b=r.render();fs.writeFileSync(pn,b.asPng())}'
          'catch(e){console.log("  ERR:"+p+" "+e.message)}}')
    subprocess.run([NODE_EXE, '-e', js], check=True)
    print(f'{fname}: PNG OK')

    import img2pdf

Tainted flow: 'NODE_EXE' from os.environ.get (line 27, credential/environment) → subprocess.run (code execution)

Medium
Category
Data Flow
Confidence
65% confidence
Finding

Data from a source is assigned to a variable that is later passed to a sink, creating a variable-mediated taint flow.

Content

Scanner excerpt · gen_code_pdfs.py (reported line 1167)May include surrounding context.

python
'try{const d=fs.readFileSync(s,"utf8");const r=new Resvg(d,{background:"#ffffff"});'
          'const b=r.render();fs.writeFileSync(pn,b.asPng())}'
          'catch(e){console.log("  ERR:"+p+" "+e.message)}}')
    subprocess.run([NODE_EXE, '-e', js], check=True)
    print(f'{fname}: PNG OK')

    import img2pdf