Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query.
If user input is incorporated into an LDAP query without proper sanitization, an attacker can inject LDAP commands that could read or modify sensitive directory information.
이 취약점을 수정하는 방법
3개의 Shoulder 탐지 규칙을 기반으로 한 LDAP Injection 예방 전략.
Use ldap.EscapeFilter to sanitize user input in LDAP queries
package main import ( "fmt" "net/http" "github.com/go-ldap/ldap/v3" ) func handler(w http.ResponseWriter, r *http.Request) { username := r.FormValue("username") - // Vulnerable: user input in LDAP filter - filter := fmt.Sprintf("(&(uid=%s)(objectClass=person))", username) + // Safe: escape special LDAP filter characters + escaped := ldap.EscapeFilter(username) + filter := fmt.Sprintf("(&(uid=%s)(objectClass=person))", escaped) searchRequest := ldap.NewSearchRequest( "dc=example,dc=com", ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, filter, []string{"dn", "cn"}, nil, ) result, _ := conn.Search(searchRequest) }
Escape LDAP special characters in user input before constructing LDAP queries
const express = require('express'); const ldap = require('ldapjs'); const app = express(); - app.post('/login', (req, res) => { - const username = req.body.username; + function escapeLDAP(str) { + return str.replace(/[\\*()\\x00]/g, c => + '\\' + c.charCodeAt(0).toString(16).padStart(2, '0')); + } + + app.post('/login', (req, res) => { + const username = escapeLDAP(req.body.username); const filter = `(&(uid=${username})(objectClass=person))`; client.search('dc=example,dc=com', { filter }, (err, result) => { res.json(result); }); });
Escape LDAP special characters using escape_filter_chars() before constructing filters
import ldap - from flask import request - - @app.route('/search') - def search(): - username = request.args.get('username') - conn = ldap.initialize('ldap://localhost') - filter_str = f"(uid={username})" + from ldap.filter import escape_filter_chars + from flask import request + + @app.route('/search') + def search(): + username = request.args.get('username', '') + safe_username = escape_filter_chars(username) + conn = ldap.initialize('ldap://localhost') + filter_str = f"(uid={safe_username})" results = conn.search_s('dc=example,dc=com', ldap.SCOPE_SUBTREE, filter_str) return str(results)
코드에서 취약점 찾기
Shoulder를 사용하여 코드에서 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') 패턴을 스캔하세요. 3 규칙.
# Scan with Shoulder CLI npx @shoulderdev/cli trust --cwe=90 # Or scan entire project npx @shoulderdev/cli trust .
탐지 규칙 (3)
코드 리뷰에서 주의할 점
이 패턴은 잠재적인 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') 취약점을 나타냅니다. 코드 리뷰와 보안 감사 중에 찾아보세요.
코드베이스를 스캔하세요: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Shoulder CLI는 전체 코드베이스에서 취약한 패턴을 찾아냅니다.