From 2ab1c1902711c8b0caf5c3e8f2fa825d72f6755d Mon Sep 17 00:00:00 2001 From: Andrey Andreev Date: Wed, 4 Jan 2017 15:26:35 +0200 Subject: Fix an XSS vulnerability --- system/core/Security.php | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'system/core') diff --git a/system/core/Security.php b/system/core/Security.php index 8b313a9a2..d198b663b 100644 --- a/system/core/Security.php +++ b/system/core/Security.php @@ -499,7 +499,7 @@ class CI_Security { * Becomes: <blink> */ $pattern = '#' - .'<((?/*\s*)(?[a-z0-9]+)(?=[^a-z0-9]|$)' // tag start and name, followed by a non-tag character + .'<((?/*\s*)((?[a-z0-9]+)(?=[^a-z0-9]|$)|.+)' // tag start and name, followed by a non-tag character .'[^\s\042\047a-z0-9>/=]*' // a valid attribute character immediately after the tag would count as a separator // optional attributes .'(?(?:[\s\042\047/=]*' // non-attribute characters, excluding > (tag close) for obvious reasons -- cgit v1.2.3-24-g4f1b From 5a2390d4d6287f2ce35cadae4713b7dcd10fdc9b Mon Sep 17 00:00:00 2001 From: Andrey Andreev Date: Wed, 4 Jan 2017 16:01:27 +0200 Subject: [ci skip] Protect CSRF verification from timing side-channel attacks --- system/core/Security.php | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'system/core') diff --git a/system/core/Security.php b/system/core/Security.php index d198b663b..585ed90ec 100644 --- a/system/core/Security.php +++ b/system/core/Security.php @@ -224,12 +224,9 @@ class CI_Security { } } - // Do the tokens exist in both the _POST and _COOKIE arrays? - if ( ! isset($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name]) - OR $_POST[$this->_csrf_token_name] !== $_COOKIE[$this->_csrf_cookie_name]) // Do the tokens match? - { - $this->csrf_show_error(); - } + // Check CSRF token validity, but don't error on mismatch just yet - we'll want to regenerate + $valid = isset($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name]) + && hash_equals($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name]); // We kill this since we're done and we don't want to pollute the _POST array unset($_POST[$this->_csrf_token_name]); @@ -245,6 +242,11 @@ class CI_Security { $this->_csrf_set_hash(); $this->csrf_set_cookie(); + if ($valid !== TRUE) + { + $this->csrf_show_error(); + } + log_message('info', 'CSRF token verified'); return $this; } -- cgit v1.2.3-24-g4f1b From ec8dbbb79bb083acd1cf6beff5abea055b583db5 Mon Sep 17 00:00:00 2001 From: Andrey Andreev Date: Wed, 4 Jan 2017 17:01:44 +0200 Subject: Fix a possible file inclusion vulnerability in CI_Loader::vars() --- system/core/Loader.php | 58 ++++++++++++++++++++++++-------------------------- 1 file changed, 28 insertions(+), 30 deletions(-) (limited to 'system/core') diff --git a/system/core/Loader.php b/system/core/Loader.php index 0515723b4..17ff2362c 100644 --- a/system/core/Loader.php +++ b/system/core/Loader.php @@ -486,7 +486,7 @@ class CI_Loader { */ public function view($view, $vars = array(), $return = FALSE) { - return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return)); + return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_prepare_view_vars($vars), '_ci_return' => $return)); } // -------------------------------------------------------------------- @@ -519,19 +519,13 @@ class CI_Loader { */ public function vars($vars, $val = '') { - if (is_string($vars)) - { - $vars = array($vars => $val); - } - - $vars = $this->_ci_object_to_array($vars); + $vars = is_string($vars) + ? array($vars => $val) + : $this->_ci_prepare_view_vars($vars); - if (is_array($vars) && count($vars) > 0) + foreach ($vars as $key => $val) { - foreach ($vars as $key => $val) - { - $this->_ci_cached_vars[$key] = $val; - } + $this->_ci_cached_vars[$key] = $val; } return $this; @@ -940,18 +934,7 @@ class CI_Loader { * the two types and cache them so that views that are embedded within * other views can have access to these variables. */ - if (is_array($_ci_vars)) - { - foreach (array_keys($_ci_vars) as $key) - { - if (strncmp($key, '_ci_', 4) === 0) - { - unset($_ci_vars[$key]); - } - } - - $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars); - } + empty($_ci_vars) OR $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars); extract($this->_ci_cached_vars); /* @@ -1382,17 +1365,32 @@ class CI_Loader { // -------------------------------------------------------------------- /** - * CI Object to Array translator + * Prepare variables for _ci_vars, to be later extract()-ed inside views * - * Takes an object as input and converts the class variables to - * an associative array with key/value pairs. + * Converts objects to associative arrays and filters-out internal + * variable names (i.e. keys prexied with '_ci_'). * - * @param object $object Object data to translate + * @param mixed $vars * @return array */ - protected function _ci_object_to_array($object) + protected function _ci_prepare_view_vars($vars) { - return is_object($object) ? get_object_vars($object) : $object; + if ( ! is_array($vars)) + { + $vars = is_object($vars) + ? get_object_vars($object) + : array(); + } + + foreach (array_keys($vars) as $key) + { + if (strncmp($key, '_ci_', 4) === 0) + { + unset($vars[$key]); + } + } + + return $vars; } // -------------------------------------------------------------------- -- cgit v1.2.3-24-g4f1b