slock 0.9 does not properly handle the XRaiseWindow event when the screen is locked, which might allow physically proximate attackers to obtain sensitive information by pressing a button, which reveals the desktop and active windows.
hg.suckless.org/slock/rev/891a4984aba6
secunia.com/advisories/48700
www.openwall.com/lists/oss-security/2012/04/06/1
www.openwall.com/lists/oss-security/2012/04/06/2
www.osvdb.org/81035
www.securityfocus.com/bid/52922
bugs.gentoo.org/show_bug.cgi?id=401645
bugzilla.redhat.com/show_bug.cgi?id=786310
exchange.xforce.ibmcloud.com/vulnerabilities/74666