Stack-based buffer overflow in the Panel (xfce4-panel) component in Xfce before 4.4.2 might allow remote attackers to execute arbitrary code via Launcher tooltips. NOTE: a second buffer overflow (over-read) in the xfce_mkdirhier function was also reported, but it might not be exploitable for a crash or code execution, so it is not a vulnerability.
http://www.xfce.org/documentation/changelogs/4.4.2
http://www.vupen.com/english/advisories/2008/0080
http://security.gentoo.org/glsa/glsa-200801-06.xml