The setName function in filesystem/File.php in SilverStripe 2.3.x before 2.3.8 and 2.4.x before 2.4.1 allows remote authenticated users with CMS author privileges to execute arbitrary PHP code by changing the extension of an uploaded file.
dl.packetstormsecurity.net/1006-exploits/silverstripe-shell.txt
doc.silverstripe.org/sapphire/en/trunk/changelogs//2.3.8
doc.silverstripe.org/sapphire/en/trunk/changelogs//2.4.1
open.silverstripe.org/changeset/107273
open.silverstripe.org/ticket/5693
www.openwall.com/lists/oss-security/2012/04/30/1
www.openwall.com/lists/oss-security/2012/04/30/3
www.openwall.com/lists/oss-security/2012/05/01/3