MCP Pentest

Instructions

Implementation Reference

• src/tools/exploit.ts:74-117 (handler)

  Core handler function implementing exploit_attempt tool logic. Categorizes vulnerability and delegates to specific exploit methods (SQLi, XSS, directory traversal, etc.). Returns structured ScanResult with attempt details.

  async exploitAttempt(target: string, vulnerability: string, payload?: string): Promise<ScanResult> {
    try {
      const exploitResults: ExploitResult[] = [];
      
      // Determine exploit strategy based on vulnerability type
      const vulnType = this.categorizeVulnerability(vulnerability);
      
      switch (vulnType) {
        case 'web':
          await this.attemptWebExploits(target, vulnerability, payload, exploitResults);
          break;
        case 'network':
          await this.attemptNetworkExploits(target, vulnerability, payload, exploitResults);
          break;
        case 'service':
          await this.attemptServiceExploits(target, vulnerability, payload, exploitResults);
          break;
        default:
          await this.attemptGenericExploits(target, vulnerability, payload, exploitResults);
      }
      
      return {
        target,
        timestamp: new Date().toISOString(),
        tool: 'exploit_attempt',
        results: {
          exploit_attempts: exploitResults,
          successful_exploits: exploitResults.filter(e => e.success),
          vulnerability_targeted: vulnerability,
          total_attempts: exploitResults.length
        },
        status: 'success'
      };
    } catch (error) {
      return {
        target,
        timestamp: new Date().toISOString(),
        tool: 'exploit_attempt',
        results: {},
        status: 'error',
        error: error instanceof Error ? error.message : String(error)
      };
    }
  }

• src/index.ts:188-200 (schema)

  MCP tool schema definition specifying input parameters and requirements for exploit_attempt.

  {
    name: "exploit_attempt",
    description: "Attempt exploitation using detected vulnerabilities",
    inputSchema: {
      type: "object",
      properties: {
        target: { type: "string", description: "Target IP/URL" },
        vulnerability: { type: "string", description: "Vulnerability identifier" },
        payload: { type: "string", description: "Payload type" }
      },
      required: ["target", "vulnerability"]
    }
  },

• src/index.ts:531-533 (registration)

  MCP server registration: dispatches exploit_attempt calls to ExploitTools.exploitAttempt method.

  case "exploit_attempt":
    return respond(await this.exploitTools.exploitAttempt(args.target, args.vulnerability, args.payload));

• src/utils/validation.ts:316-366 (helper)

  Input validation helper specifically for exploit_attempt tool, ensuring valid target and required vulnerability parameter.

      case 'exploit_attempt':
        this.validateExploitArgs(args);
        break;
      // Add more tool-specific validations as needed
    }
  }
  
  private validateNmapArgs(args: any): void {
    if (args.target) {
      const validation = this.targetValidator.validateTarget(args.target);
      if (!validation.isValid) {
        throw new ValidationError(`Invalid nmap target: ${validation.error}`, 'INVALID_NMAP_TARGET');
      }
    }
  
    const allowedScanTypes = ['quick', 'full', 'stealth', 'aggressive'];
    if (args.scan_type && !allowedScanTypes.includes(args.scan_type)) {
      throw new ValidationError('Invalid scan type', 'INVALID_SCAN_TYPE');
    }
  }
  
  private validateNucleiArgs(args: any): void {
    if (args.target) {
      const validation = this.targetValidator.validateTarget(args.target);
      if (!validation.isValid) {
        throw new ValidationError(`Invalid nuclei target: ${validation.error}`, 'INVALID_NUCLEI_TARGET');
      }
    }
  
    const allowedSeverities = ['info', 'low', 'medium', 'high', 'critical'];
    if (args.severity && !allowedSeverities.includes(args.severity)) {
      throw new ValidationError('Invalid severity level', 'INVALID_SEVERITY');
    }
  }
  
  private validateExploitArgs(args: any): void {
    if (args.target) {
      const validation = this.targetValidator.validateTarget(args.target);
      if (!validation.isValid) {
        throw new ValidationError(`Invalid exploit target: ${validation.error}`, 'INVALID_EXPLOIT_TARGET');
      }
    }
  
    // Additional checks for exploitation attempts
    if (!args.vulnerability) {
      throw new ValidationError('Vulnerability identifier required for exploitation', 'MISSING_VULNERABILITY');
    }
  
    // Log exploitation attempts for audit purposes
    console.log(`AUDIT: Exploitation attempt - Target: ${args.target}, Vulnerability: ${args.vulnerability}`);
  }