鬼仔's Blog

由于Discuz!d的include/moderation.inc.php存在一个’二次攻击’导致数据库’注射’的bug
author: 80vul-B
team:http://www.80vul.com

一 分析

在文件include/moderation.inc.php里代码:

$threadlist = $loglist = array();
if($tids = implodeids($moderate)) {
$query = $db->query("SELECT * FROM {$tablepre}threads WHERE tid IN ($tids) AND fid='$fid' AND displayorder>='0' AND digest>='0' LIMIT $tpp");
while($thread = $db->fetch_array($query)) {
...
$threadlist[$thread['tid']] = $thread;
...
foreach($threadlist as $tid => $thread) {
...
if($type == 'redirect') {
$db->query("INSERT INTO {$tablepre}threads (fid, readperm, iconid, author, authorid, subject, dateline, lastpost, lastposter, views, replies, displayorder, digest, closed, special, attachment)
VALUES ('$thread[fid]', '$thread[readperm]', '$thread[iconid]', '".addslashes($thread['author'])."', '$thread[authorid]', '".addslashes($thread['subject'])."', '$thread[dateline]', '$thread[dblastpost]', '$thread[lastposter]', '0', '0', '0', '0', '$thread[tid]', '0', '0')");

这个比较明显,从数据库查询出的值$thread[lastposter]直接带入了insert语句中,导致了注射:)
这个看上去比上面的那个用处大些,其实有很多的限制.首先$thread[lastposter]是从数据库中查询出来的值,有字数限制[不能大于15个字符];其次,这个地方需要版主权限才能操作.

二 利用

注册新用户,用户名为80vul’,发表新回复,然后用拥有版主权限的账号将此帖转移,移动方式选为[移动主题并在原来的版块中保留转向],和上面的效果一样,执行时数据库报错了:)

三 补丁[fix]
等待官方补丁.