Security audit

Safe Cron Runner

Security checks for vulnerabilities and agentic risk

Overview

The skill is a disclosed command-running utility, but its safety claims are undercut by concrete privilege, logging, timeout, and release-verification weaknesses.

Review before installing or using from any privileged or multi-user environment. Treat it as a small command wrapper, not a complete sandbox: avoid running secret-bearing commands, do not rely on the /tmp log for secure audit storage, and require fixes for supplementary groups, process-group termination, secure logging, and version-matched signed manifests before production use.

A.I.G

Vulnerability Patterns

Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
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

Findings (4)

T05 · Unauthorized Access and Privilege Escalation

Error

Location: safe_cron.py:22
Finding: Supplementary Groups Are Retained During Privilege Dropping
Content: View full analysis
Remediation: View remediation

T09 · Insecure Skill Coding Practices

Error

Location: safe_cron.py:68
Finding: Predictable Privileged Log File Permits Symlink Attacks and Sensitive Data Exposure
Content: View full analysis
Remediation: View remediation

T09 · Insecure Skill Coding Practices

Warning

Location: safe_cron.py:48
Finding: Timeout Kills Only the Direct Child and Leaves Descendant Processes Running
Content: View full analysis
Remediation: View remediation

T09 · Insecure Skill Coding Practices

Warning

Location: isnad_manifest.json:5
Finding: Integrity Manifest Does Not Match the Advertised Release Version
Content: View full analysis
Remediation: View remediation

SkillSpector

Vulnerability Patterns

Behavioral ASTexec() Call, eval() Call, Dynamic Import
MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access

Findings (2)

Undeclared Tool Scope

Medium

Category: MCP Least Privilege
Confidence: 90% confidence
Finding: The skill advertises security-sensitive behavior and demonstrates subprocess execution, yet it declares no explicit tool scope such as permissions or allowed-tools. That creates a governance gap: an agent platform may permit broader shell or file capabilities than intended, undermining the skill's own safety claims and making misuse or overreach easier if the skill is invoked in a permissive environment.
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 · safe_cron.py (reported line 50)May include surrounding context.
python
try: # We use subprocess.Popen without shell=True for maximum safety process = subprocess.Popen( command_parts, stdout=subprocess.PIPE, stderr=subprocess.PIPE,

Static analysis

No suspicious patterns detected.