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WordPress NAB Transact WooCommerce 2.1.0 Payment Bypass

WordPress NAB Transact WooCommerce 2.1.0 Payment Bypass
Posted Aug 20, 2020
Authored by Jack Misiura

WordPress NAB Transact WooCommerce plugin version 2.1.0 suffers from a payment bypass vulnerability.

tags | exploit, bypass
advisories | CVE-2020-11497
SHA-256 | 38cc536fa634ad0e7e4c8028f098b79ee4e5dc38a1859d06b32822642b372df3

WordPress NAB Transact WooCommerce 2.1.0 Payment Bypass

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Title: Payment bypass



Product: WordPress NAB Transact WooCommerce Plugin



Vendor Homepage: https://woocommerce.com/products/nab-transact-direct-post/



Vulnerable Version: 2.1.0



Fixed Version: 2.1.2



CVE Number: CVE-2020-11497



Author: Jack Misiura from The Missing Link



Website: https://www.themissinglink.com.au



Timeline:



2020-03-27 Disclosed to Vendor

2020-03-29 Vendor publishes first fix

2020-04-04 Vendor publishes second fix

2020-08-17 Fix confirmed

2020-08-20 Publication



1. Vulnerability Description



The WordPress NAB Transact WooCommerce plugin does not validate the origin of payment processor status requests, allowing orders to be marked as fully paid by issuing a specially crafted GET request during the ordering workflow.



2. PoC



When presented with a payment screen, instead of submitting payment information, issue the following GET request to the site:



https://example-site.com/?wc-api=WC_Gateway_Nab_Direct_Post&order=XXXX&key= wc_order_YYYYY&is_crn=0&txnid=ZZZZZ&refid=WooCommerceXXXX&rescode=00&restext=Approved



Where XXXX is the order number and YYYY is the order code which have been present before during the workflow. If these are not presented, submit invalid payment information and get a declined message. Now brute-force the order number which is sequential. Doing so will mark any existing pending orders as fully paid.



3. Solution



The vendor provides an updated version (2.1.2) which should be installed immediately.



4. Advisory URL



https://www.themissinglink.com.au/security-advisories








Jack Misiura​


Application Security Consultant




a



9‑11 Dickson Avenue


Artarmon


NSW


2064



p


1300 865 865



os


+61 2 8436 8585



w


<https://www.themissinglink.com.au/> themissinglink.com.au












<https://www.linkedin.com/company/the-missing-link-pty-ltd/>

<https://www.facebook.com/The-Missing-Link-268395013346228/?ref=bookmarks>

<https://twitter.com/TML_au>

<https://www.youtube.com/channel/UC2kd4mDmBs3SjW4lX3fFHnQ>

<https://www.instagram.com/the_missing_link_it/>







<https://www.themissinglink.com.au/robotic-process-automation>





​CAUTION - This message may contain privileged and confidential information intended only for the use of the addressee named above. If you are not the intended recipient of this message you are hereby notified that any use, dissemination, distribution or reproduction of this message is prohibited. If you have received this message in error please notify The Missing Link immediately. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of The Missing Link.



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