CRLF injection vulnerability in the drupal_set_header function in Drupal 6.x before 6.38, when used with PHP before 5.1.2, allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks by leveraging a module that allows user-submitted data to appear in HTTP headers.
www.debian.org/security/2016/dsa-3498
www.openwall.com/lists/oss-security/2016/02/24/19
www.openwall.com/lists/oss-security/2016/03/15/10
github.com/drupal/core
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2016-3166.yaml
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2016-3166.yaml
nvd.nist.gov/vuln/detail/CVE-2016-3166
www.drupal.org/SA-CORE-2016-001