429 lines
15 KiB
PHP
429 lines
15 KiB
PHP
<?php
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/**
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* @package Joomla.JEDChecker
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*
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* @copyright Copyright (C) 2017 - 2019 Open Source Matters, Inc. All rights reserved.
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* Copyright (C) 2008 - 2016 fasterjoomla.com. All rights reserved.
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* @author Riccardo Zorn <support@fasterjoomla.com>
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* Bernard Toplak <bernard@orion-web.hr>
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*
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* @license GNU General Public License version 2 or later; see LICENSE.txt
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*/
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defined('_JEXEC') or die('Restricted access');
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// Include the rule base class
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require_once JPATH_COMPONENT_ADMINISTRATOR . '/models/rule.php';
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/**
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* JedcheckerRulesJamss
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*
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* @since 2014-02-23
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* Attempts to identify deprecated code, unsafe code, leftover stuff
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*/
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class JedcheckerRulesJamss extends JEDcheckerRule
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{
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/**
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* The formal ID of this rule. For example: SE1.
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*
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* @var string
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*/
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protected $id = 'Jamss';
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/**
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* The title or caption of this rule.
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*
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* @var string
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*/
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protected $title = 'COM_JEDCHECKER_RULE_JAMSS';
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/**
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* The description of this rule.
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*
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* @var string
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*/
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protected $description = 'COM_JEDCHECKER_RULE_JAMSS_DESC';
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protected $ext;
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protected $patterns;
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protected $jamssFileNames;
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/**
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* Initiates the file search and check
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*
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* @return void
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*/
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public function check()
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{
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$files = JFolder::files($this->basedir, '', true, true);
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$this->init_jamss();
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foreach ($files as $file)
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{
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$this->find($file);
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}
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}
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/**
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* reads a file and searches for any function defined in the params
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*
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* @param string $file The file name
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*
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* @return boolean True if the statement was found, otherwise False.
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*/
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protected function find($file)
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{
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$content = (array) file($file);
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$result = false;
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$this->scan_file($file);
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return $result;
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}
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/**
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* This will initialize the local variables for use by jamss.
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* In order to make this easy to update, no syntax changes are applied. Just store the variables in the object
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* for faster use.
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*
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* @param bool $deepscan Merge the $jamssDeepSearchStrings
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*
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* @return void
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*/
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private function init_jamss($deepscan = true)
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{
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/*
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* START OF JAMSS CODE (approx line 76)
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*/
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/* * * * * Patterns Start * * * * */
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$jamssStrings = 'r0nin|m0rtix|upl0ad|r57shell|c99shell|shellbot|phpshell|void\.ru|';
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$jamssStrings .= 'phpremoteview|directmail|bash_history|multiviews|cwings|vandal|bitchx|';
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$jamssStrings .= 'eggdrop|guardservices|psybnc|dalnet|undernet|vulnscan|spymeta|raslan58|';
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$jamssStrings .= 'Webshell|str_rot13|FilesMan|FilesTools|Web Shell|ifrm|bckdrprm|';
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$jamssStrings .= 'hackmeplz|wrgggthhd|WSOsetcookie|Hmei7|Inbox Mass Mailer|HackTeam|Hackeado';
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$jamssStrings .= 'Janissaries|Miyachung|ccteam|Adminer|OOO000000|$GLOBALS|findsysfolder';
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// These patterns will be used if GET parameter ?deepscan=1 is set while calling jamss.php file
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$jamssDeepSearchStrings = 'eval|base64_decode|base64_encode|gzdecode|gzdeflate|';
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$jamssDeepSearchStrings .= 'gzuncompress|gzcompress|readgzfile|zlib_decode|zlib_encode|';
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$jamssDeepSearchStrings .= 'gzfile|gzget|gzpassthru|iframe|strrev|lzw_decompress|strtr';
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$jamssDeepSearchStrings .= 'exec|passthru|shell_exec|system|proc_|popen';
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// The patterns to search for
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$jamssPatterns = array(
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array('preg_replace\s*\(\s*[\"\']\s*(\W)(?-s).*\1[imsxADSUXJu\s]*e[imsxADSUXJu\s]*[\"\'].*\)',
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// [0] = RegEx search pattern
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'PHP: preg_replace Eval',
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// [1] = Name / Title
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'1',
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// [2] = number
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'Detected preg_replace function that evaluates (executes) mathed code. ' .
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'This means if PHP code is passed it will be executed.',
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// [3] = description
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'Part example code from http://sucuri.net/malware/backdoor-phppreg_replaceeval'),
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// [4] = More Information link
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array('c999*sh_surl',
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'Backdoor: PHP:C99:045',
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'2',
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'Detected the "C99? backdoor that allows attackers to manage (and reinfect) your site remotely. ' .
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'It is often used as part of a compromise to maintain access to the hacked sites.',
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'http://sucuri.net/malware/backdoor-phpc99045'),
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array('preg_match\s*\(\s*\"\s*/\s*bot\s*/\s*\"',
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'Backdoor: PHP:R57:01',
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'3',
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'Detected the "R57? backdoor that allows attackers to access, modify and reinfect your site. ' .
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'It is often hidden in the filesystem and hard to find without access to the server or logs.',
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'http://sucuri.net/malware/backdoor-phpr5701'),
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array('eval[\s/\*\#]*\(stripslashes[\s/\*\#]*\([\s/\*\#]*\$_(REQUEST|POST|GET)\s*\[\s*\\\s*[\'\"]\s*asc\s*\\\s*[\'\"]',
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'Backdoor: PHP:GENERIC:07',
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'5',
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'Detected a generic backdoor that allows attackers to ' .
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'upload files, delete files, access, modify and/or reinfect your site. ' .
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'It is often hidden in the filesystem and hard to find without access to the server or logs. ' .
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'It also includes uploadify scripts and similars that offer upload options without security. ',
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'http://sucuri.net/malware/backdoor-phpgeneric07'),
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/*array('https?\S{1,63}\.ru',
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'russian URL',
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'6',
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'Detected a .RU domain link, as there are many attacks leading the innocent visitors to .RU pages.
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Maybe i\'s valid link, but we leave it to you to check this out.',
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),*/
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array('preg_replace\s*\(\s*[\"\'\”]\s*/\s*\.\s*\*\s*/\s*e\s*[\"\'\”]\s*,\s*[\"\'\”]\s*\\x65\\x76\\x61\\x6c',
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'Backdoor: PHP:Filesman:02',
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'7',
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'Detected the “Filesman” backdoor that allows attackers to access, modify and reinfect your site. ' .
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'It is often hidden in the filesystem and hard to find without access to the server or logs.',
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'http://sucuri.net/malware/backdoor-phpfilesman02'),
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array('(include|require)(_once)*\s*[\"\'][\w\W\s/\*]*php://input[\w\W\s/\*]*[\"\']',
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'PHP:\input include',
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'8',
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'Detected the method of reading input through PHP protocol handler in include/require statements.',),
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array('data:;base64',
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'data:;base64 include',
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'9',
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'Detected the method of executing base64 data in include.',),
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array('RewriteCond\s*%\{HTTP_REFERER\}',
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'.HTACCESS RewriteCond-Referer',
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'10',
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'Your .htaccess file has a conditional redirection based on "HTTP Referer". ' .
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'This means it redirects according to site/url from where your visitors came to your site. ' .
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'Such technique has been used for unwanted redirections after coming from Google or other search engines, ' .
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'so check this directive carefully.',),
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array('brute\s*force',
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'"Brute Force" words',
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'11',
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'Detected the "Brute Force" words mentioned in code. <u>Sometimes it\'s a "false positive"</u> because ' .
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'several developers like to mention it in they code, but it\'s worth double-checking if this file ' .
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'is untouched (eg. compare it with one in original extension package).'),
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array('GIF89a.*[\r\n]*.*<\?php',
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'PHP file desguised as GIF image',
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'15',
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'Detected a PHP file that was most probably uploaded as an image via webform that loosely only checks ' .
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'file headers.',),
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array('\$ip[\w\W\s/\*]*=[\w\W\s/\*]*getenv\(["\']REMOTE_ADDR["\']\);[\w\W\s/\*]*[\r\n]\$message',
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'Probably malicious PHP script that "calls home"',
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'16',
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'Detected script variations often used to inform the attackers about found vulnerable website.',),
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array('(?:(?:eval|gzuncompress|gzinflate|base64_decode|str_rot13|strrev|strtr|preg_replace|rawurldecode|' .
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'str_replace|assert|unpack|urldecode)[\s/\*\w\W\(]*){2,}',
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'PHP: multiple encoded, most probably obfuscated code found',
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'17',
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'This pattern could be used in highly encoded, malicious code hidden under a loop of code obfuscation function ' .
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'calls. In most cases the decoded hacker code goes through an eval call to execute it. ' .
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'This pattern is also often used for legitimate purposes, e.g. storing configuration information or ' .
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'serialised object data. ' .
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'Please inspect the file manually and compare it with the one in the original extension or ' .
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'Joomla package to verify that this is not a false positive.',
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'Thanks to Dario Pintarić (dario.pintaric[et}orion-web.hr for this report!'),
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array('<\s*iframe',
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'IFRAME element',
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'18',
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'Found IFRAME element in code. It\'s mostly benevolent, but often used for bad stuff, ' .
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'so please check if it\'s a valid code.'),
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array('strrev[\s/\*\#]*\([\s/\*\#]*[\'"]\s*tressa\s*[\'"]\s*\)',
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'Reversed string "assert"',
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'19',
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'Assert function name is being hidden behind strrev().'),
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array('is_writable[\s/\*\#]*\([\s/\*\#]*getcwd',
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'Is the current DIR Writable?',
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'20',
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'This could be harmless, but used in some malware'),
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array('(?:\\\\x[0-9A-Fa-f]{1,2}|\\\\[0-7]{1,3}){2,}',
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'At least two characters in hexadecimal or octal notation',
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'21',
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'Found at least two characters in hexadecimal or octal notation. It doesn\'t mean it is malicious, ' .
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'but it could be code hidding behind such notation.'),
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array('\$_F\s*=\s*__FILE__\s*;\s*\$_X\s*=',
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'SourceCop encoded code',
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'22',
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'Found the SourceCop encoded code. It is often used for malicious code ' .
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'hiding, so go and check the code with some online SourceCop decoders'),
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array('(?:exec|passthru|shell_exec|system|proc_|popen)[\w\W\s/\*]*\([\s/\*\#\'\"\w\W\-\_]*(?:\$_GET|\$_POST)',
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'shell command execution from POST/GET variables',
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'23',
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'Found direct shell command execution getting variables from POST/GET, ' .
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'which is highly dangerous security flaw or a part of malicious webrootkit'),
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array('\$\w[\w\W\s/\*]*=[\w\W\s/\*]*`.*`',
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'PHP execution operator: backticks (``)',
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'24',
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'PHP execution operator found. Note that these are not single-quotes! ' .
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'PHP will attempt to execute the contents of the backticks as a shell ' .
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'command, which might indicate a part of a webrootkit'),
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);
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$jamssFileNames = array(
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'Probably an OpenFlashChart library demo file that has known input validation error (CVE-2009-4140)'
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=> 'ofc_upload_image.php',
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'Probably an R57 shell'
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=> 'r57.php',
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'PhpInfo() file? It is advisable to remove such file, as it could reveal too
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much info to potential attackers'
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=> 'phpinfo.php',
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);
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/* * * * * Patterns End * * * * */
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// Check if DeepScan should be done
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if (isset($_GET['deepscan']))
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{
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$patterns = array_merge($jamssPatterns, explode('|', $jamssStrings), explode('|', $jamssDeepSearchStrings));
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}
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else
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{
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$patterns = array_merge($jamssPatterns, explode('|', $jamssStrings));
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}
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/*
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* END OF JAMSS CODE (approx line 203)
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*/
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$this->patterns = $patterns;
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$this->jamssFileNames = $jamssFileNames;
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$valid_extensions = explode('|', $this->params->get('fileExt'));
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$this->ext = $valid_extensions;
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}
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/**
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* Scan given file for all malware patterns
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*
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* @param string $path path of the scanned file
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*
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* @return bool
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*/
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private function scan_file($path)
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{
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// Init the variables scan_file expects:
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$ext = $this->ext;
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$patterns = $this->patterns;
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$count = 0;
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$total_results = 0;
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$jamssFileNames = $this->jamssFileNames;
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// Removed: global $ext, $patterns, $count, $total_results, $jamssFileNames;
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/**
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* JAMSS Code, line 251 (all output functions were changed to conform to jedchecker output)
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*/
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if (in_array(pathinfo($path, PATHINFO_EXTENSION), $ext)
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&& filesize($path)/* skip empty ones */
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&& !stripos($path, 'jamss.php')/* skip this file */)
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{
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if ($malic_file_descr = array_search(pathinfo($path, PATHINFO_BASENAME), $jamssFileNames))
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{
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$this->jamssWarning($path, JText::_('COM_JEDCHECKER_ERROR_JAMSS_SUSPICIOUS_FILENAME'), $malic_file_descr, '', 0);
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}
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if (!($content = file_get_contents($path)))
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{
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$this->report->addError($path, JText::_('COM_JEDCHECKER_ERROR_JAMSS_CANNOT_OPEN') . $malic_file_descr, 0);
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return true;
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}
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else
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{
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// Do a search for fingerprints
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foreach ($patterns As $pattern)
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{
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if (is_array($pattern))
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{
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// It's a pattern
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// RegEx modifiers: i=case-insensitive; s=dot matches also newlines; S=optimization
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preg_match_all('#' . $pattern[0] . '#isS', $content, $found, PREG_OFFSET_CAPTURE);
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}
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else
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{
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// It's a string
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preg_match_all('#' . $pattern . '#isS', $content, $found, PREG_OFFSET_CAPTURE);
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}
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// Remove outer array from results
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$all_results = $found[0];
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// Count the number of results
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$results_count = count($all_results);
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// Total results of all fingerprints
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$total_results += $results_count;
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// Added to avoid notices.
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$first_line = 0;
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$first_code = "";
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if (!empty($all_results))
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{
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$count++;
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if (is_array($pattern))
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{
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// Then it has some additional comments
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foreach ($all_results as $match)
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{
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// Output the line of malware code, but sanitize it before
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// The offset is in $match[1]
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$first_code = substr($content, $match[1], 200);
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$first_line = $this->calculate_line_number($match[1], $content);
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break;
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}
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$this->jamssWarning(
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$path,
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JText::_('COM_JEDCHECKER_ERROR_JAMSS_PATTERN') . "#$pattern[2] - $pattern[1]",
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$pattern[3],
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$first_code,
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$first_line
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);
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}
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else
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{
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// It's a string, no comments available
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$first_content = "";
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foreach ($all_results as $match)
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{
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// Output the line of malware code, but sanitize it before
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$first_code = substr($content, $match[1], 200);
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$first_line = $this->calculate_line_number($match[1], $content);
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break;
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}
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$this->jamssWarning(
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$path,
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JText::_('COM_JEDCHECKER_ERROR_JAMSS_STRING') . $pattern,
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'',
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$first_code,
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$first_line
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);
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}
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}
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}
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unset($content);
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}
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}
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return false;
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}
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/**
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* Calculates the line number where pattern match was found
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*
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* @param int $offset The offset position of found pattern match
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* @param string $file_content The file content in string format
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*
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* @return int Returns line number where the subject code was found
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*/
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private function calculate_line_number($offset, $file_content)
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{
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// Fetches all the text before the match
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list($first_part) = str_split($file_content, $offset);
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$line_nr = strlen($first_part) - strlen(str_replace("\n", "", $first_part)) + 1;
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return $line_nr;
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}
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/**
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* Raise a warning and format it properly.
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* jamss warnings are very helpful but very verbose; hence we chose to use of tooltips
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*
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* @param string $path The file name
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* @param string $title The comment's title
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* @param mixed $info The additional info on the error
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* @param string $code The affected portion of the code
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* @param int $line The line number of the first match
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*
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* @return void Returns nothing
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*/
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private function jamssWarning($path, $title, $info, $code, $line)
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{
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$info = !empty($info)?sprintf($this->params->get('info'), htmlentities($info, ENT_QUOTES)):"";
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$code = !empty($code)?sprintf($this->params->get('code'), htmlentities($code, ENT_QUOTES)):"";
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$this->report->addWarning($path, $info . $code . $title, $line);
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}
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}
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