Double free vulnerability in the Widget Library (libxfcegui4) in Xfce before 4.4.2 might allow remote attackers to execute arbitrary code via unknown vectors related to the "cliend id, program name and working directory in session management."

DISPUTED Xfce4-session 4.5.91 in Xfce does not lock the screen when the suspend or hibernate button is pressed, which might make it easier for physically proximate attackers to access an unattended laptop via a resume action, a related issue to CVE-2010-2532. NOTE: there is no general agreement that this is a vulnerability, because separate control over locking can be an equally secure, or more secure, behavior in some threat environments.

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 xfcemkdirhier function was also reported, but it might not be exploitable for a crash or code execution, so it is not a vulnerability.