Overview
Injection vulnerabilities like CWE-89 can let attackers alter database queries, potentially exposing sensitive data or causing denial of service. CVE-2023-54359 documents a time-based blind SQL injection in WordPress adivaha Travel Plugin 2.3 where an unauthenticated attacker manipulated queries via the 'pid' parameter. While this CVE targets a WordPress plugin, the underlying risk is universal: unsafely incorporating user input into SQL queries can enable attackers to influence query logic and timing.
Exploitation in the WordPress case involved crafting requests to the /mobile-app/v3/ endpoint with poisoned pid values, leveraging XOR-based payloads to extract data or induce delays. The same logic applies to Go services: if you build SQL statements by concatenating strings with user-supplied inputs, attackers can inject SQL, read or modify data, or trigger DoS by forcing long-running queries.
In Go using the Gin framework, this risk appears when code constructs SQL by string formatting or concatenation instead of parameter binding. Even if you intend to cast inputs, you must validate and bind values safely. The fix is to use parameterized queries via database/sql (or an ORM) and to validate inputs to ensure they conform to expected types and ranges. The following code example demonstrates vulnerable vs secure patterns and how to fix them in a real Go (Gin) app.
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"context"
"database/sql"
"log"
"net/http"
"strconv"
"time"
"github.com/gin-gonic/gin"
_ "github.com/lib/pq"
)
type User struct {
ID int
Name string
}
func main() {
dsn := "postgres://user:pass@localhost/dbname?sslmode=disable"
db, err := sql.Open("postgres", dsn)
if err != nil {
log.Fatal(err)
}
// Optional: connection pool tuning for production
db.SetMaxOpenConns(25)
db.SetMaxIdleConns(25)
db.SetConnMaxLifetime(5 * time.Minute)
r := gin.Default()
// Vulnerable pattern route: demonstrates unsafe string concatenation
r.GET("/vuln/mobile-app/v3/", func(c *gin.Context) {
pid := c.Query("pid")
u, err := getUserVuln(db, pid)
if err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
c.JSON(http.StatusOK, gin.H{"id": u.ID, "name": u.Name})
})
// Secure pattern route: uses parameterized query
r.GET("/secure/mobile-app/v3/", func(c *gin.Context) {
pid := c.Query("pid")
u, err := getUserSafe(db, pid)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
c.JSON(http.StatusOK, gin.H{"id": u.ID, "name": u.Name})
})
r.Run(":8080")
}
func getUserVuln(db *sql.DB, pid string) (User, error) {
var u User
// Vulnerable: directly concatenating user input into SQL
query := "SELECT id, name FROM users WHERE pid = " + pid
row := db.QueryRow(query)
if err := row.Scan(&u.ID, &u.Name); err != nil {
return u, err
}
return u, nil
}
func getUserSafe(db *sql.DB, pid string) (User, error) {
var u User
id, err := strconv.Atoi(pid)
if err != nil {
return u, err
}
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
// Secure: parameterized query with placeholder $1
row := db.QueryRowContext(ctx, "SELECT id, name FROM users WHERE pid = $1", id)
if err := row.Scan(&u.ID, &u.Name); err != nil {
return u, err
}
return u, nil
}