Drupal 7.14 <= Full Path Disclosure Vulnerability
About Drupal:
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Issue: Full Path Disclosure
风险等级: Medium
The remote attacker has the possibility to detect the full local path of drupal.
This information can be used for processing further attacks against the server.
In includes/bootstrap.inc, line 2695:
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function request_path() {
static $path;
if (isset($path)) {
return $path;
}
if (isset($_GET['q'])) {
// This is a request with a ?q=foo/bar query string. $_GET['q'] is
// overwritten in drupal_path_initialize(), but request_path() is called
// very early in the bootstrap process, so the original value is saved in
// $path and returned in later calls.
$path = $_GET['q'];
}
elseif (isset($_SERVER['REQUEST_URI'])) {
// This request is either a clean URL, or 'index.php', or nonsense.
// Extract the path from REQUEST_URI.
$request_path = strtok($_SERVER['REQUEST_URI'], '?');
$base_path_len = strlen(rtrim(dirname($_SERVER['SCRIPT_NAME']), '\/'));
// Unescape and strip $base_path prefix, leaving q without a leading slash.
$path = substr(urldecode($request_path), $base_path_len + 1);
// If the path equals the script filename, either because 'index.php' was
// explicitly provided in the URL, or because the server added it to
// $_SERVER['REQUEST_URI'] even when it wasn't provided in the URL (some
// versions of Microsoft IIS do this), the front page should be served.
if ($path == basename($_SERVER['PHP_SELF'])) {
$path = '';
}
}
else {
// This is the front page.
$path = '';
}
// Under certain conditions Apache's RewriteRule directive prepends the value
// assigned to $_GET['q'] with a slash. Moreover we can always have a trailing
// slash in place, hence we need to normalize $_GET['q'].
$path = trim($path, '/');
return $path;
}
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Exploit / Proof Of Concept:
/?q[]=x
-------------------------------------
修复方案：
Search for:
$path = trim($path, '/');
And add the following line above:
if(is_array($path)) { die(); }
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