### 简要描述:
Thinksaas SQL注入#3
### 详细说明:
在Thinksaas 的小组功能处,发完贴后,可以补贴。
在编辑补贴时,过滤不完整,导致SQL注入,直接可以注入出数据,显示到帖子内容中。
/app/group/action/after.php文件,在边编辑补贴内容时:
```
//编辑执行
case "edo":
if($_POST['token'] != $_SESSION['token']) {
tsNotice('非法操作!');
}
$afterid = intval($_POST['afterid']);
$strAfter = $new['group']->find('group_topic_add',array(
'id'=>$afterid,
));
if($strAfter['userid'] == $userid || $TS_USER['user']['isadmin']==1){
$content = tsClean($_POST['content']);
$title = tsClean($_POST['title']);
//过滤内容开始
aac('system')->antiWord($title);
aac('system')->antiWord($content);
//过滤内容结束
$new['group']->update('group_topic_add',array(
'id'=>$afterid,
),array(
'title'=>$title,
'content'=>$content,
'uptime'=>time(),
));
```
利用tsClean函数过滤,/thinksaas/tsFunction.php:
```
/**
* 过滤脚本代码
* @param unknown $text
* @return mixed
*/
function cleanJs($text) {
$text = trim ( $text );
$text = stripslashes ( $text );
// 完全过滤注释
$text = preg_replace ( '/<!--?.*-->/', '', $text );
// 完全过滤动态代码
$text = preg_replace ( '/<\?|\?>/', '', $text );
// 完全过滤js
$text = preg_replace ( '/<script?.*\/script>/', '', $text );
// 过滤多余html
$text = preg_replace ( '/<\/?(html|head|meta|link|base|body|title|style|script|form|iframe|frame|frameset)[^><]*>/i', '', $text );
// 过滤on事件lang js
while ( preg_match ( '/(<[^><]+)(lang|onfinish|onmouse|onexit|onerror|onclick|onkey|onload|onchange|onfocus|onblur)[^><]+/i', $text, $mat ) ) {
$text = str_replace ( $mat [0], $mat [1], $text );
}
while ( preg_match ( '/(<[^><]+)(window\.|javascript:|js:|about:|file:|document\.|vbs:|cookie)([^><]*)/i', $text, $mat ) ) {
$text = str_replace ( $mat [0], $mat [1] . $mat [3], $text );
}
return $text;
}
/**
* 输入安全过滤
* @param unknown $text
* @return mixed
*/
function tsClean($text) {
$text = cleanJs ( $text );
return $text;
}
```
只是过滤了JS内容,然后带入update语句:
```
public function update($table, $conditions, $row) {
$where = "";
if (empty ( $row ))
return FALSE;
if (is_array ( $conditions )) {
$join = array ();
foreach ( $conditions as $key => $condition ) {
$condition = $this->escape ( $condition );
$join [] = "{$key} = {$condition}";
}
$where = "WHERE " . join ( " AND ", $join );
} else {
if (null != $conditions)
$where = "WHERE " . $conditions;
}
foreach ( $row as $key => $value ) {
$vals [] = "`$key` = '$value'";
}
$values = join ( ", ", $vals );
$sql = "UPDATE " . dbprefix . "{$table} SET {$values} {$where}";
return $this->db->query ( $sql );
}
```
我们输入的内容带入了update的row中,没有过滤,导致sql注入。
### 漏洞证明:
先发一个帖子,然后跟一个补贴。
在来编辑方才跟的那个补贴内容:
[<img src="https://images.seebug.org/upload/201312/191620278706f21c0c12b9ddfb92ffc9fbcd1ea9.png" alt="1.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201312/191620278706f21c0c12b9ddfb92ffc9fbcd1ea9.png)
看看数据库的执行日志:
[<img src="https://images.seebug.org/upload/201312/19162038d95948f61687eb1f02dbaa0214ab0bf7.png" alt="2.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201312/19162038d95948f61687eb1f02dbaa0214ab0bf7.png)
再来看我们跟的那个补贴的内容发生的变化:
[<img src="https://images.seebug.org/upload/201312/191620458eb1480782780adea0c5184c4a798694.png" alt="3.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201312/191620458eb1480782780adea0c5184c4a798694.png)
成功注入。
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