CVE-2016-6485: Unauthenticated crypto and weak IV in Magento\Framework\Encryption

November 20, 2019 (updated February 10, 2025)

The __construct function in Framework/Encryption/Crypt.php in Magento 2 uses the PHP rand function to generate a random number for the initialization vector, which makes it easier for remote attackers to defeat cryptographic protection mechanisms by guessing the value.

References

github.com/FriendsOfPHP/security-advisories/blob/master/magento/product-community-edition/CVE-2016-6485.yaml
github.com/advisories/GHSA-h7qw-mxrm-c6h2
github.com/magento/magento2/pull/15017
nvd.nist.gov/vuln/detail/CVE-2016-6485

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