Cisco Talos warns of Apple iOS and MacOS X.509 certificate flaw

Cisco Talos today warned of a flaw in the X.509 certificate validation feature of Apple macOS and iOS that could let an attacker remotely execute code and steal information.

X.509 security certificates are widely used and integral to many Internet protocols, including TLS/SSL, which is the basis for HTTPS, the secure web browsing protocol.

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“For most people, securely connecting to a website seems as simple as checking to make sure the little padlock in the address bar is present. However, in the background there are many different steps that are taken to ensure you are safely and securely connecting to the websites that claim they are who they are. This process includes certificate validation, or making sure that the servers that users are connecting to present “identification” showing they are legitimate. This helps to protect users from fraudulent servers that might otherwise steal sensitive information,” Talos wrote.

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