Detect an XPath input from an HTTP request

문서 > Datadog 보안 > Code Security > Static Code Analysis (SAST) > SAST 규칙 > Detect an XPath input from an HTTP request

이 페이지는 아직 영어로 제공되지 않습니다. 번역 작업 중입니다.
현재 번역 프로젝트에 대한 질문이나 피드백이 있으신 경우 언제든지 연락주시기 바랍니다.

Metadata

ID: python-flask/xpath-injection

Language: Python

Severity: Error

Category: Security

CWE: 20

Description

No description found

Non-Compliant Code Examples

from flask import request
from lxml import etree

@app.route('/authenticate')
def authenticate():
    username = request.args['username']
    password = request.args['password']
    expression = "./users/user[@name='" + username + "' and @pass='" + password + "']"
    tree = etree.parse('resources/users.xml')

    if tree.find(expression) is None:
        return "Invalid credentials", 401
    else:
        return "Success", 200

Compliant Code Examples

from flask import request
from lxml import etree

@app.route('/authenticate')
def authenticate():
    username = request.args['username']
    password = request.args['password']
    expression = "./users/user[@name=$username and @pass=$password]"
    tree = etree.parse('resources/users.xml')

    if tree.xpath(expression, username=username, password=password) is None:
        return "Invalid credentials", 401
    else:
        return "Success", 200