Zero Dollar Authorization Exploit - Payflow Pro - M2.2.6

[AndyJAllen]

Preconditions (*)

1. Magento 2.2.6
2. Payflow Pro

Steps to reproduce (*)

1. Have Payflow Pro enabled and website live long enough to be attacked

Expected result (*)

1. I would expect the Paypal module wouldn't let fradulent cards get tested with $0 amounts and most data fields being NULL

Actual result (*)

1. Many automated $0 transactions being recorded in logs and on Paypal
   
2. Note there are a bunch of people experiencing this, and to my knowledge this hasn't been posted on github yet. https://community.magento.com/t5/Magento-2-x-Technical-Issues/PayPal-Payflow-extension-exploited-for-fraudulent-transactions/m-p/123002#M8349

Example from the Magento Paypal Log:
[2019-03-21 12:01:19] main.DEBUG: array (
'request' =>
array (
'user' => '(removed)',
'vendor' => '(removed)',
'partner' => '(removed)',
'pwd' => '(removed)',
'verbosity' => 'HIGH',
'BUTTONSOURCE' => 'Magento_Cart_Community',
'tender' => 'C',
'trxtype' => 'A',
'amt' => 0,
'createsecuretoken' => 'Y',
'securetokenid' => '(removed)',
'returnurl' => '(removed)/paypal/transparent/response/',
'errorurl' => '(removed)/paypal/transparent/response/',
'cancelurl' => '(removed)/paypal/transparent/cancel/',
'disablereceipt' => 'TRUE',
'silenttran' => 'TRUE',
'firstname' => NULL,
'lastname' => NULL,
'street' => '',
'city' => NULL,
'state' => NULL,
'zip' => NULL,
'country' => NULL,
'email' => NULL,
'shiptofirstname' => NULL,
'shiptolastname' => NULL,
'shiptostreet' => '',
'shiptocity' => NULL,
'shiptostate' => NULL,
'shiptozip' => NULL,
'shiptocountry' => NULL,
),
'result' =>
array (
'result' => '0',
'securetoken' => '(removed)',
'securetokenid' => '(removed)',
'respmsg' => 'Approved',
'result_code' => '0',
),

[magento-engcom-team]

Hi @AndyJAllen. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

For more details, please, review the Magento Contributor Assistant documentation.

@AndyJAllen do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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Hi @AndyJAllen thank you for you report, this issue has already fixed in 2.2-develop and 2.3-develop branch and will be available on 2.2.8 and 2.3.1 release. #21781

[AndyJAllen]

The latest Paypal module code from the 2.2-develop branch did NOT work! I still got hit with $0 auths! Please re-open issue.

[larryflp]

We have about 30 extensions and custom theme installed on 3 sites that are currently affected.

Instead of doing a full site upgrade, which would take a while, can I just copy a particular directory that contains the PayFlow updated files?

Also, can I simply copy the files over on the three sites being on different M versions? The sites are on:

2.2.6
2.2.1
2.1.5

I'm assuming I may be able to copy the directory with PayFlow files to the 2.2.x sites and not need to upgrade. Would I need to upgrade the 2.1.5 site?

Over the last 3 weeks we've been turned off by PayFlow 3-4 times trying to figure out the issue and its nice to see this is addressed. We are currently down on 3 of our sites and I need to get back online ASAP.

Thanks in advance.

Larry

[JorenRapini]

Does anyone have a solution to this yet? Our store just started having this same exact issue. Just updated to the latest magento 2 version too and it's still happening.

[larryflp]

I believe there are captcha options you can enable in the latest versions of Magento that are supposed to prevent the carding issue.

We were affected very badly a couple of years ago and ended up just switching over to Stripe. Free to sign up and no monthly fees.

[JorenRapini]

I believe there are captcha options you can enable in the latest versions of Magento that are supposed to prevent the carding issue.

We were affected very badly a couple of years ago and ended up just switching over to Stripe. Free to sign up and no monthly fees.

Ahhhh looks like that did the trick, thanks