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fvwm: fvwm-menu-directory fvwm command injection


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200611-17 / fvwm
Release Date November 23, 2006
Latest Revision November 23, 2006: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
x11-wm/fvwm < 2.5.18-r1 >= 2.5.18-r1 All supported architectures

Related bugreports: #155078


A flaw in fvwm-menu-directory may permit a local attacker to execute arbitrary commands with the privileges of another user.

2.  Impact Information


fvwm is a highly configurable virtual window manager for X11 desktops. fvwm-menu-directory allows fvwm users to browse directories from within fvwm.


Tavis Ormandy of the Gentoo Linux Security Audit Team discovered that fvwm-menu-directory does not sufficiently sanitise directory names prior to generating menus.


A local attacker who can convince an fvwm-menu-directory user to browse a directory they control could cause fvwm commands to be executed with the privileges of the fvwm user. Fvwm commands can be used to execute arbitrary shell commands.

3.  Resolution Information


There is no known workaround at this time.


All fvwm users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-wm/fvwm-2.5.18-r1"

4.  References


Page updated November 23, 2006

Summary: This is a Gentoo Linux Security Advisory

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