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[KIS-2021-03] ExpressionEngine <= 6.0.2 (Translate::save) PHP Code Injection Vulnerability
From: research () karmainsecurity com
Date: Mon, 15 Mar 2021 20:13:46 +0100
----------------------------------------------------------------------------ExpressionEngine <= 6.0.2 (Translate::save) PHP Code Injection Vulnerability
---------------------------------------------------------------------------- [-] Software Link: https://expressionengine.com/ [-] Affected Versions: Version 6.0.2 and prior versions. Version 5.4.1 and prior versions. [-] Vulnerability Description:The vulnerable code is located in the "ExpressionEngine\Controller\Utilities\Translate::save()" method:
362. private function save($language, $file)
363. {
364.
365. $file = ee()->security->sanitize_filename($file);
366.
367. $dest_dir = $this->languages_dir . $language . '/';
368. $filename = $file . '_lang.php';
369. $dest_loc = $dest_dir . $filename;
370.
371. $str = '<?php' . "\n" . '$lang = array(' . "\n\n\n";
372.
373. ee()->lang->loadfile($file);
374.
375. foreach ($_POST as $key => $val) {
376. $val = str_replace('<script', '', $val);
377. $val = str_replace('<iframe', '', $val);
378. $val = str_replace(array("\\", "'"), array("\\\\",
"\'"), $val);
379.380. $str .= '\'' . $key . '\' => ' . "\n" . '\'' . $val . '\'' . ",\n\n";
381. }
382.
383. $str .= "''=>''\n);\n\n";
384. $str .= "// End of File";
[...]
400. $this->load->helper('file');
401.
402. if (write_file($dest_loc, $str)) {
403. ee('CP/Alert')->makeInline('shared-form')
404. ->asSuccess()
405. ->withTitle(lang('translations_saved'))
406. ->addToBody(sprintf(lang('file_saved'),
$dest_loc))
407. ->defer();User input passed via keys of POST parameters is not properly sanitized before being assigned to the "$str" variable at line 380. Such a variable will be used in a call to the "write_file()"
function at line 402, trying to write user supplied content into the/system/user/language/[lang]/[file]_lang.php file. This can be exploited to inject and execute arbitrary PHP code. Successful exploitation of this vulnerability requires an account with
permissions to access the CP translation system utilities. [-] Solution: Upgrade to version 6.0.3, 5.4.2, or later. [-] Disclosure Timeline: [03/02/2021] - Vendor notified through HackerOne [15/02/2021] - Vulnerability acknowledged by the vendor [16/02/2021] - CVE number assigned [17/02/2021] - Version 6.0.3 released [04/03/2021] - Version 5.4.2 released [15/03/2021] - Public disclosure [-] CVE Reference: The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2021-27230 to this vulnerability. [-] Credits: Vulnerability discovered by Egidio Romano. [-] Other References: https://hackerone.com/reports/1093444 [-] Original Advisory: http://karmainsecurity.com/KIS-2021-03 _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
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- [KIS-2021-03] ExpressionEngine <= 6.0.2 (Translate::save) PHP Code Injection Vulnerability research (Mar 15)
