Security audit

Casual Cron

Security checks for vulnerabilities and agentic risk

Overview

This skill appears to create scheduled reminders/messages as advertised, with no evidence of hidden exfiltration or destructive behavior.

Install only if you want the agent to create OpenClaw cron jobs that can send messages to channels such as Telegram, Slack, Discord, WhatsApp, or Signal. Review each parsed schedule before approving it, especially recurring jobs and destinations, because those jobs can continue running until removed.

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

Tool MisuseTool Parameter Abuse, Chaining Abuse, Unsafe Defaults
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 (33)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 235)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 238)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 240)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 243)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 246)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 248)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 95% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 235)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 95% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 243)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 235)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 243)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Chaining Abuse

High

Category: Tool Misuse
Confidence: 75% confidence
Finding: Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 235)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Chaining Abuse

High

Category: Tool Misuse
Confidence: 75% confidence
Finding: Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 238)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Chaining Abuse

High

Category: Tool Misuse
Confidence: 75% confidence
Finding: Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 240)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Chaining Abuse

High

Category: Tool Misuse
Confidence: 75% confidence
Finding: Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.
Content: Scanner excerpt · test/test_cron_builder.py (reported line 243)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Chaining Abuse

High

Category: Tool Misuse
Confidence: 75% confidence
Finding: Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.
Content: Scanner excerpt · test/test_cron_builder.py (reported line 246)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Chaining Abuse

High

Category: Tool Misuse
Confidence: 75% confidence
Finding: Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.
Content: Scanner excerpt · test/test_cron_builder.py (reported line 248)May include surrounding context.
python
class TestShellEscaping(unittest.TestCase): def test_name_with_semicolon(self): parsed = parse('daily reminder at 8am') parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 95% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 238)May include surrounding context.
python
parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 95% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 240)May include surrounding context.
python
parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 95% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 246)May include surrounding context.
python
parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 95% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 248)May include surrounding context.
python
parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 238)May include surrounding context.
python
parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 246)May include surrounding context.
python
parsed['name'] = 'test; rm -rf /' cmd = build_command(parsed) # shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd)

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · skills/casual-cron/test/test_cron_builder.py (reported line 240)May include surrounding context.
python
# shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd) def test_name_with_single_quote(self): parsed = parse('daily reminder at 8am')

Tool Parameter Abuse

High

Category: Tool Misuse
Confidence: 100% confidence
Finding: Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
Content: Scanner excerpt · test/test_cron_builder.py (reported line 248)May include surrounding context.
python
# shlex.quote wraps in single quotes — semicolon is safely quoted self.assertIn("'test; rm -rf /'", cmd) # Verify it's passed as --name value (not bare) self.assertIn("--name 'test; rm -rf /'", cmd) def test_name_with_single_quote(self): parsed = parse('daily reminder at 8am')

Undeclared Tool Scope

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.

Static analysis

No suspicious patterns detected.