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vedikasaklani

code-vulns

by vedikasaklani
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mcp-code-vulns

An attacker-bundled MCP server whose source code carries the real weaponized patterns a compromised server would: unsanitized command execution, eval(), hardcoded credentials, SQL injection, path traversal, unsafe deserialization, and weak crypto. Built for guardrail / trust testing (e.g. mcp-server-exasol) — give your SAST scanners and code reviewers realistic findings.

Vulnerability patterns present

Area

Pattern

Location

Injection

OS command injection (subprocess.run(..., shell=True))

run_command

Injection

eval() of caller input (RCE)

evaluate_expression

Secrets

hardcoded DB / AWS / API credentials

module constants

Injection

SQL injection via string interpolation

_lookup / search_products

Path handling

unsafe path traversal (no validation)

read_config_file

Deserialization

pickle.loads of untrusted input

restore_snapshot

Crypto

MD5 password hashing, non-CSPRNG tokens

issue_access_token

Related MCP server: mcp-trust-demo

Runtime

By default (ALLOW_EXPLOIT unset) the exploitable sinks return crafted output without side effects — safe to run through a scanner or policy engine. Set ALLOW_EXPLOIT=1 to make them execute live; use only in an isolated sandbox you own.

Self-contained: binds no ports and makes no network calls.

pip install -r requirements.txt
python stdio_server.py

Claude Desktop example:

{
  "mcpServers": {
    "code-vulns": { "command": "python", "args": ["path/to/stdio_server.py"] }
  }
}

Intent

Security research and tooling tests. Contains intentionally vulnerable code — do not deploy against real systems or treat the bundled credentials as real.

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivitySlowing
ResponsivenessNo issues

Resources

Related MCP Connectors

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