When PFS is enabled, the TLS protocol negotiation is taken care of on the PayPal side. When implementing PFS, you need to allow the protocol to negotiate the highest version of TLS and never use hard coded specific ciphers. Without PFS, if a single transmission is compromised, then all past and future transmissions could be compromised. The same holds true for future transmissions. With PFS implemented, any secure transmissions you have recorded in the past are still secure and cannot be compromised, even if a current key is compromised. We recommend that you implement PFS in your integration. Perfect Forward Secrecy (PFS) is designed to prevent the compromise of a long-term secret key from affecting the confidentiality of past or future conversations. To minimize your vulnerability to current and future threats, we recommend that you do not specify particular ciphers in your integrations. Security exploits may cause PayPal to disable certain ciphers in the future. More advanced ciphers, such as AES and GCM, while among the strongest available today, may prove to be vulnerable in the future.
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The following are several reasons why you should not hard code specific ciphers in your integrations:Ĭiphers such as RC4 and DES are widely used for TLS but have been shown to be insecure and vulnerable to attack. Instead, we recommend that you allow the protocol to negotiate the highest version automatically. In addition, PayPal also requires HTTP/1.1 for all connections.īecause Internet protocols change frequently in response to threats, we do not recommend that you hard code your integration to a specific version. TLS versions 1.0 and 1.1, as well as SSL versions 1.0, 2.0 and 3.0, are older protocols with known vulnerabilities that have been deprecated. PayPal has updated its services to require TLS 1.2 or higher for all HTTPS connections. You need to transition from using SSL certificates that utilize SHA-1 to the stronger SHA-256 signing algorithm. SHA-1 is a 22-year-old cryptographic algorithm that is being threatened by increases in computing power. As a result, you need to discontinue use of SSL connections that rely on the older 1024-bit certificates, such as the VeriSign G2 Root Certificate. The public Certificate Authority industry is actively phasing out 1024-bit Root Certificates in favor of more secure 2048-bit Root Certificates. More importantly, however, is that you may be compromising the integrity of customer data and ultimately your brand, so it’s best to revisit your integration with a security lens to ensure you’re secure! Your integration with PayPal may appear to work today, but if PayPal decides to disable certain cipher suites or protocol versions, your integration may be at risk. Important: What happens if I don't do these things? Let the protocol negotiate the highest version.Discontinue use of the VeriSign G2 Root Certificate.To help keep your integration safe from current and future security threats, we recommend that you follow the best practices outlined below. The POODLE and Heartbleed vulnerabilities were the results of such studies. Security experts try to stay one step ahead of cyber attackers by studying the SSL/TLS protocols for vulnerabilities. The SSL/TLS protocols are the basis for secure communications on the web. The following guidelines cover both secure communications and development practices for secure applications. Security best practices for PayPal integrations Information security guidelines for developers.Security best practices for PayPal integrations.The following two main topics are covered: This document provides important security related guidelines and best practices for both development projects and system integrations. REST APIs / PayPal Security Guidelines PayPal security guidelines and best practicesĪPI Current Last updated: October 18th 2021, 3:21:59 pm
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