Discuz! System Error 您当前的访问请求当中含有非法字符

作者：袖梨 2022-06-25

Discuz! X3.1 正式版含目前最新版[2014-03-01]在用户退出时偶尔会提示如下错误，特别是数据整合后的站点：

错误代码：

Discuz! System Error 您当前的访问请求当中含有非法字符，已经被系统拒绝
PHP Debug
[Line: 0022]search.php(discuz_application->init)
[Line: 0071]sourceclassdiscuzdiscuz_application.php(discuz_application->_init_misc)
[Line: 0552]sourceclassdiscuzdiscuz_application.php(discuz_application->_xss_check)
[Line: 0355]sourceclassdiscuzdiscuz_application.php(system_error)
[Line: 0017]sourcefunctionfunction_core.php(discuz_error::system_error)
[Line: 0024]sourceclassdiscuzdiscuz_error.php(discuz_error::debug_backtrace)


临时解决方法：
修改 sourceclassdiscuz下的discuz_application.php文件大约第350行的private function _xss_check()方法：

 代码如下 复制代码

private function _xss_check() {

static $check = array('"', '>', '<', ''', '(', ')', 'CONTENT-TRANSFER-ENCODING');

if(isset($_GET['formhash']) && $_GET['formhash'] !== formhash()) {
system_error('request_tainting');
}

if($_SERVER['REQUEST_METHOD'] == 'GET' ) {
$temp = $_SERVER['REQUEST_URI'];
} elseif(empty ($_GET['formhash'])) {
$temp = $_SERVER['REQUEST_URI'].file_get_contents('php://input');
} else {
$temp = '';
}

if(!empty($temp)) {
$temp = strtoupper(urldecode(urldecode($temp)));
foreach ($check as $str) {
if(strpos($temp, $str) !== false) {
system_error('request_tainting');
}
}
}

return true;
}
为

private function _xss_check() {
$temp = strtoupper(urldecode(urldecode($_SERVER['REQUEST_URI'])));
if(strpos($temp, '<') !== false || strpos($temp, '"') !== false || strpos($temp, 'CONTENT-TRANSFER-ENCODING') !== false) {
system_error('request_tainting');
}
return true;
}

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