Origin validation error in CardGate module for Magento 2 - CVE-2020-8818

Vulnerability identifier: #VU25725

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-8818

CWE-ID: CWE-346

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a lack of origin authentication at IPN callback processing function in "Controller/Payment/Callback.php" file. A remote attacker can replace critical plugin settings (merchant id, secret key etc) with known to him and therefore bypass payment process (eg. spoof order status by manually sending IPN callback request with a valid signature but without real payment) and/or receive all subsequent payments (on behalf of the store).

CardGate module for Magento 2

Install updates from vendor's website.

CardGate module for Magento 2 - update to 2.0.31

• Exploit #5762 - Magento WooCommerce CardGate Payment Gateway 2.0.30 - Payment Process Bypass (June 17, 2021)

• https://github.com/cardgate/magento2/issues/54
• https://snyk.io/vuln/SNYK-PHP-CARDGATEMAGENTO2-552157
• https://www.exploit-db.com/exploits/48135
• https://github.com/cardgate/magento2/pull/53/commits/93fb0d1de8c3b85d72d986e46bdf97db5206efda
• https://github.com/cardgate/magento2/pull/53
• https://github.com/cardgate/magento2/blob/715979e54e1a335d78a8c5586f9e9987c3bf94fd/Controller/Payment/Callback.php#L88-L107

• Origin validation error in CardGate module for Magento 2