Security Audit

webapp-testing

github.com/sickn33/antigravity-awesome-skills

AI SkillCommit e36d6fd3b3f6

CRITICAL

Scanned about 1 month ago

Critical

Immediate action required

High

Priority fixes suggested

Medium

Best practices review

Low

Acknowledged / Tracked

Trust Assessment

webapp-testing received a trust score of 10/100, placing it in the Untrusted category. This skill has significant security findings that require attention before use in production.

SkillShield's automated analysis identified 6 findings: 3 critical, 2 high, 1 medium, and 0 low severity. Key findings include Arbitrary command execution, Dangerous call: subprocess.run(), Dangerous call: subprocess.Popen().

The analysis covered 4 layers: Manifest Analysis, Static Code Analysis, Dependency Graph, LLM Behavioral Safety. The Manifest Analysis layer scored lowest at 40/100, indicating areas for improvement.

Last analyzed on February 20, 2026 (commit e36d6fd3). SkillShield performs automated 4-layer security analysis on AI skills and MCP servers.

Layer Breakdown

Manifest Analysis

40%

Static Code Analysis

63%

Dependency Graph

100%

LLM Behavioral Safety

70%

Behavioral Risk Signals

Network Access

1 finding

Shell Execution

5 findings

Dynamic Code

1 finding

Excessive Permissions

1 finding

Security Findings6

Severity	Finding	Layer	Location
CRITICAL	Arbitrary command execution Python shell execution (os.system, subprocess) Review all shell execution calls. Ensure commands are static (not built from user input), use absolute paths, and are strictly necessary. Prefer library APIs over shell commands.	Manifest	skills/webapp-testing/scripts/with_server.py:69
CRITICAL	Arbitrary command execution Python shell execution (os.system, subprocess) Review all shell execution calls. Ensure commands are static (not built from user input), use absolute paths, and are strictly necessary. Prefer library APIs over shell commands.	Manifest	skills/webapp-testing/scripts/with_server.py:88
CRITICAL	Command Injection via shell=True with user-controlled input The `scripts/with_server.py` script executes user-supplied server commands using `subprocess.Popen` with `shell=True`. The `server['cmd']` variable is populated directly from the `--server` command-line argument, which is controlled by the user. This allows an attacker to inject arbitrary shell commands by manipulating the `--server` argument, leading to remote code execution on the host system. Avoid using `shell=True` when executing user-supplied commands. Instead, parse the command string into a list of arguments (e.g., using `shlex.split()`) and pass it directly to `subprocess.Popen` with `shell=False` (the default). If features like `cd` or `&&` are required, consider handling them explicitly within the Python script (e.g., `os.chdir()`) or by executing commands sequentially without relying on the shell's interpretation of the entire string.	LLM	scripts/with_server.py:66
HIGH	Dangerous call: subprocess.run() Call to 'subprocess.run()' detected in function 'main'. This can execute arbitrary code. Avoid using dangerous functions like exec/eval/os.system. Use safer alternatives.	Static	skills/webapp-testing/scripts/with_server.py:88
HIGH	Dangerous call: subprocess.Popen() Call to 'subprocess.Popen()' detected in function 'main'. This can execute arbitrary code. Avoid using dangerous functions like exec/eval/os.system. Use safer alternatives.	Static	skills/webapp-testing/scripts/with_server.py:69
MEDIUM	Suspicious import: socket Import of 'socket' detected. This module provides network or low-level system access. Verify this import is necessary. Network and system modules in skill code may indicate data exfiltration.	Static	skills/webapp-testing/scripts/with_server.py:18

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