#VU25673 Origin validation error in CardGate Payments for WooCommerce - CVE-2020-8819

Vulnerability identifier: #VU25673

Vulnerability risk: Medium

CVSSv4.0: 5.5 [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/E:P/U:Green]

CVE-ID: CVE-2020-8819

CWE-ID: CWE-346

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
CardGate Payments for WooCommerce
Web applications / Modules and components for CMS

Vendor: CardGate

Description

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. 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).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

CardGate Payments for WooCommerce: 3.0.4 - 3.1.15

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External links
https://packetstormsecurity.com/files/156504/WordPress-WooCommerce-CardGate-Payment-Gateway-3.1.15-Bypass.html
https://github.com/cardgate/woocommerce/blob/f2111af7b1a3fd701c1c5916137f3ac09482feeb/cardgate/cardgate.php#L426-L442
https://github.com/cardgate/woocommerce/issues/18
https://wpvulndb.com/vulnerabilities/10097
https://www.exploit-db.com/exploits/48134

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.