Command Injection in Chi with Cockroachdb

Command injection in a Chi-based Go service that uses CockroachDB can occur when input from HTTP requests is passed to system-level commands without proper validation or sanitization. Chi is a lightweight router that encourages explicit route handling, but if user-controlled data such as query parameters, headers, or body fields are forwarded to shell commands—often via exec.Command or similar—they can enable arbitrary command execution. CockroachDB, while a robust distributed SQL database, does not prevent this class of flaw; it only provides the data layer. An attacker might supply a malicious hostname, database name, or other identifier that ends up as an argument to a shell command used for diagnostics, migrations, or external tooling.

For example, consider a handler that constructs a cockroach node status command using string concatenation with user input:

nodeID := r.URL.Query().Get("node_id")
cmd := exec.Command("cockroach", "node", "status", "--node=" + nodeID)
out, _ := cmd.Output()

If node_id is not strictly validated, an attacker can inject additional shell commands using shell metacharacters (e.g., ; echo pwned). Even if CockroachDB itself is not directly exploitable via SQL in this scenario, the surrounding infrastructure becomes the attack surface. The scanner may flag this as an insecure external call, especially when combined with unauthenticated endpoints or verbose error messages that leak command output.

Because middleBrick tests the unauthenticated attack surface across 12 parallel checks, it can detect command injection patterns when API endpoints trigger unexpected behavior or expose system-level responses. Remediation focuses on avoiding shell interpretation entirely and enforcing strict input constraints.

To eliminate command injection risk when integrating CockroachDB with Chi, avoid constructing shell commands with user input. Instead, use CockroachDB’s native Go driver and parameterized queries. The following example shows a secure handler that retrieves node information using the lib/pq driver without invoking a shell:

package main

import (
	"context"
	"fmt"
	"net/http"

	"github.com/go-chi/chi/v5"
	"github.com/lib/pq"
)

func nodeStatusHandler(db *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		nodeID := chi.URLParam(r, "nodeID")
		var status string
		// Safe: parameterized query, no shell involvement
		err := db.QueryRow(context.Background(),
			"SELECT status FROM crdb_internal.node_status WHERE node_id = $1",
			nodeID).Scan(&status)
		if err != nil {
			http.Error(w, "unable to retrieve status", http.StatusInternalServerError)
			return
		}
		fmt.Fprintf(w, "Node %s status: %s", nodeID, status)
	}
}

If you must invoke external tooling for administrative tasks, bypass the shell entirely by using explicit argument lists and strict allowlists:

allowedNodes := map[string]bool{"n1": true, "n2": true, "n3": true}
nodeID := chi.URLParam(r, "nodeID")
if !allowedNodes[nodeID] {
	http.Error(w, "invalid node ID", http.StatusBadRequest)
	return
}
cmd := exec.Command("cockroach", "node", "status", "--node=" + nodeID)
cmd.Dir = "/safe/path"
out, err := cmd.Output()
if err != nil {
	http.Error(w, "command failed", http.StatusInternalServerError)
	return
}

Additionally, enforce input validation schemas and use middleBrick’s CLI to scan your endpoints regularly. The middlebrick scan <url> command can identify risky patterns in your API surface, including endpoints that may indirectly interact with CockroachDB through external processes. For ongoing protection, the Pro plan enables continuous monitoring and CI/CD integration, helping you catch regressions before deployment.