Cross Site Request Forgery in Cassandra

Cross Site Request Forgery (CSRF) in Cassandra applications occurs when authenticated users unknowingly execute malicious requests from untrusted origins. In Cassandra-based systems, this typically manifests through web applications that interact with Cassandra databases via REST APIs or web interfaces.

The core vulnerability arises when Cassandra applications rely solely on session cookies for authentication without implementing proper anti-CSRF measures. Since Cassandra itself doesn't handle HTTP sessions or cookies, the CSRF vulnerability exists in the application layer that interfaces with Cassandra.

// Vulnerable Cassandra application code
@POST
@Path("/updateUser")
@Consumes(MediaType.APPLICATION_JSON)
public Response updateUser(User user) {
    // No CSRF token validation
    session.execute("UPDATE users SET name = ? WHERE id = ?",
        user.getName(), user.getId());
    return Response.ok().build();
}

This pattern is particularly dangerous in Cassandra applications because the database often stores sensitive user data, authentication tokens, or session information. An attacker could craft a malicious request that, when executed by an authenticated user, modifies data, deletes records, or elevates privileges within the Cassandra cluster.

Cassandra's eventual consistency model can exacerbate CSRF impacts. If a CSRF attack modifies data across multiple nodes, the inconsistent state during propagation could lead to data corruption or unauthorized access before the system achieves consistency.

Common attack vectors in Cassandra applications include:

• Admin panel interfaces that manage Cassandra keyspaces or user permissions
• APIs that modify Cassandra schema or replication factors
• Endpoints that execute CQL queries based on user input
• Web interfaces for monitoring Cassandra cluster health

The stateless nature of Cassandra means that applications must implement their own session management, making them responsible for CSRF protection. Without proper safeguards, any authenticated Cassandra management interface becomes a potential CSRF target.

Detecting CSRF vulnerabilities in Cassandra applications requires examining both the application code and the runtime behavior of the system. middleBrick's black-box scanning approach can identify CSRF vulnerabilities without requiring access to source code or credentials.

middleBrick tests for CSRF by attempting authenticated requests without proper anti-CSRF tokens. For Cassandra applications, the scanner looks for:

• State-changing operations (POST, PUT, DELETE) that accept session cookies without CSRF protection
• Admin endpoints that modify Cassandra configuration or data
• APIs that execute CQL queries based on unvalidated input
• Endpoints that expose sensitive Cassandra metrics or configuration

The scanner evaluates the application's response to malicious requests, checking if authenticated state changes occur without proper anti-CSRF validation. For Cassandra-specific endpoints, middleBrick tests operations that could affect data integrity or availability.

// Example middleBrick scan output for CSRF vulnerability
{
  "category": "Authentication",
  "severity": "High",
  "finding": "CSRF vulnerability in Cassandra admin API",
  "description": "State-changing POST request to /cassandra/admin/update can be executed without anti-CSRF token",
  "remediation": "Implement CSRF tokens or same-site cookies for all state-changing operations",
  "impact": "An attacker could modify Cassandra cluster configuration or delete data"
}

Manual detection techniques include:

# Test for CSRF by attempting state change without token
curl -X POST https://api.example.com/cassandra/admin/update \
  -H "Cookie: sessionid=VALID_SESSION" \
  -H "Content-Type: application/json" \
  -d '{"keyspace": "production", "replication": {"class": "SimpleStrategy", "replication_factor": 1}}'

Security teams should also examine Cassandra application logs for unusual patterns, such as unexpected schema modifications or data deletions originating from web interfaces rather than authorized admin tools.

Remediating CSRF vulnerabilities in Cassandra applications requires implementing proper anti-CSRF mechanisms at the application layer. Since Cassandra itself doesn't handle HTTP requests, all protection must be implemented in the web application code that interfaces with Cassandra.

The most effective approach is implementing double-submit cookies with SameSite attributes:

@Provider
public class CsrfFilter implements ContainerRequestFilter {
    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        if (isStateChangingRequest(requestContext)) {
            String csrfHeader = requestContext.getHeaderString("X-CSRF-TOKEN");
            String csrfCookie = getCookieValue(requestContext, "CSRF-TOKEN");
            
            if (csrfHeader == null || !csrfHeader.equals(csrfCookie)) {
                requestContext.abortWith(
                    Response.status(Status.FORBIDDEN).entity("CSRF token missing or invalid").build());
                return;
            }
        }
    }
}

For Cassandra applications, it's crucial to protect endpoints that modify data or configuration:

@POST
@Path("/secureUpdate")
@Consumes(MediaType.APPLICATION_JSON)
public Response secureUpdate(@Valid User user, 
                            @HeaderParam("X-CSRF-TOKEN") String csrfToken) {
    // Validate CSRF token before any Cassandra operation
    if (!csrfService.validateToken(csrfToken)) {
        return Response.status(Status.FORBIDDEN).build();
    }
    
    // Safe to execute Cassandra operation
    session.execute("UPDATE users SET name = ? WHERE id = ?",
        user.getName(), user.getId());
    return Response.ok().build();
}

SameSite cookie attributes provide additional protection:

@GET
@Path("/login")
@Produces(MediaType.APPLICATION_JSON)
public Response login(@Valid Credentials credentials) {
    String sessionId = authService.authenticate(credentials);
    NewCookie sessionCookie = new NewCookie("sessionid", sessionId,
        "/", null, null, -1, true, true, "Strict");
    
    String csrfToken = UUID.randomUUID().toString();
    NewCookie csrfCookie = new NewCookie("CSRF-TOKEN", csrfToken,
        "/", null, null, -1, true, true, "Strict");
    
    return Response.ok().cookie(sessionCookie).cookie(csrfCookie).build();
}

For Cassandra admin interfaces, implement role-based access control with CSRF protection:

@POST
@Path("/cassandra/admin/modifyKeyspace")
@RolesAllowed("admin")
public Response modifyKeyspace(@Valid KeyspaceConfig config,
                              @HeaderParam("X-CSRF-TOKEN") String csrfToken) {
    if (!csrfService.validateToken(csrfToken)) {
        return Response.status(Status.FORBIDDEN).build();
    }
    
    // Only allow keyspace modifications from trusted sources
    if (!request.getSourceIp().isTrusted()) {
        return Response.status(Status.FORBIDDEN).build();
    }
    
    session.execute("ALTER KEYSPACE ? WITH replication = ?",
        config.getKeyspace(), config.getReplication());
    return Response.ok().build();
}

Additional protections for Cassandra applications include:

• Input validation for all CQL queries to prevent injection attacks that could bypass CSRF protection
• Rate limiting on admin endpoints to reduce attack surface
• Audit logging for all schema modifications and data changes
• Network-level restrictions on Cassandra management interfaces

middleBrick's GitHub Action can automatically scan your Cassandra application's API endpoints as part of your CI/CD pipeline, ensuring CSRF protections remain intact across deployments:

- name: Run middleBrick Security Scan
  uses: middlebrick/middlebrick-action@v1
  with:
    target: https://api.example.com
    fail-on-severity: high
    token: ${{ secrets.MIDDLEBRICK_TOKEN }}