一、漏洞成因

Extract和Trunk源码：

class Extract(TimezoneMixin, Transform):
    lookup_name = None
    output_field = IntegerField()

    def __init__(self, expression, lookup_name=None, tzinfo=None, **extra):
        if self.lookup_name is None:
            self.lookup_name = lookup_name
        if self.lookup_name is None:
            raise ValueError('lookup_name must be provided')
        self.tzinfo = tzinfo
        super().__init__(expression, **extra)

class Trunc(TruncBase):

    def __init__(self, expression, kind, output_field=None, tzinfo=None, is_dst=None, **extra):
        self.kind = kind
        super().__init__(
            expression, output_field=output_field, tzinfo=tzinfo,
            is_dst=is_dst, **extra
        )

Extract用于提取日期，可以提起日期字段中的年，月，日。如2022-7-13 12:12:12可以提取2022。

Trunc用于截取日期，比如日期字段中年，月，日。可以截取2022-7-13。

此次SQL注入漏洞的成因就是将数据赋值给lookup_name或kind时，未经过过滤或转义则直接进行了数据库的查询。

影响版本：3.2.0-3.2.14，4.0.0-4.0.6

二、复现

1.环境搭建

1，数据库的搭建：

2，django搭建

Settings.py:
            
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'cve34265',
        'USER': 'root',
        'PASSWORD': 'root',
        'HOST': 'localhost',
        'PORT': '3306',
    }
}


models.py:
        
from datetime import datetime
from django.db import models


class Experiment(models.Model):
    start_datetime = models.DateTimeField()
    start_date = models.DateField(null=True, blank=True)
    start_time = models.TimeField(null=True, blank=True)

    class Meta:
        db_table = 'experiment'

urls.py:

from cve.views import test
from django.contrib import admin
from django.urls import path

urlpatterns = [
    path('extract_test/',test.extract_test),
    path('trunc_test/',test.trunc_test),
    path('admin/', admin.site.urls),
]

test.py:


from django.shortcuts import render
from django.http import HttpResponse
from django.db.models.functions import Extract, Trunc
from cve.models import Experiment


def extract_test(request):
    lookup_name = request.GET.get('lookup_name')
    test = Experiment.objects.filter(start_datetime__year=Extract('start_datetime', lookup_name)).exists()
    print(test)
    return HttpResponse('extract_test')


def trunc_test(request):
    kind = request.GET.get('kind')
    test = Experiment.objects.filter(start_datetime__day=Trunc('start_datetime', kind)).exists()
    print(test)
    return HttpResponse('trunc_test')

# Create your views here.