SimpleSAMLphp 1.14.12 and earlier make it easier for man-in-the-middle attackers to obtain sensitive information by leveraging use of the aesEncrypt and aesDecrypt methods in the SimpleSAML/Utils/Crypto class to protect session identifiers in replies to non-HTTPS service providers.
github.com/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/simplesamlphp/CVE-2017-12870.yaml
github.com/simplesamlphp/simplesamlphp
github.com/simplesamlphp/simplesamlphp/commit/4c939be1696bacb2b95ee11d4ebc5814a08b04c5
nvd.nist.gov/vuln/detail/CVE-2017-12870
simplesamlphp.org/security/201704-01