Note d'Information No. 2006/VULN534
DATE : 17/11/2006
HARDWARE PLATFORM(S) :
OPERATING SYSTEM(S) : Solaris 9, Solaris 8, Solaris 10 running libXfont.
Sun(sm) Alert Notification
* Sun Alert ID: 102714
* Synopsis: Security Vulnerability With Integer Multiplication
Within libXfont Affects Solaris X11 Servers
* Category: Security
* Product: Solaris 9 Operating System, Solaris 10 Operating System,
Solaris 8 Operating System
* BugIDs: 6465806, 6465805
* Avoidance: Workaround
* State: Workaround
* Date Released: 14-Nov-2006
* Date Closed:
* Date Modified:
The Xsun(1) server and Xorg(1) server are the X display servers for
Version 11 of the X window system on Solaris.
There exists an overflow vulnerability when performing integer
multiplication within the libXfont library, as used by the X11 display
servers, that can cause a heap overflow while loading the fonts. This
may allow a local unprivileged user to be able to execute arbitrary
commands with elevated privileges or create a Denial of Service (DoS)
to the display managers.
This issue is described in the following documents:
2. Contributing Factors
This issue can occur in the following releases:
* Solaris 8
* Solaris 9
* Solaris 10
* Solaris 8
* Solaris 9
* JDS release 2 (for Solaris 9)
* Solaris 10
Note: Xorg(1) is not shipped in Solaris 8
To determine the version of JDS that is currently installed on the
system, run the following command (output will vary by platform):
% grep platform /usr/share/gnome/gnome-about/gnome-version.xml
Alternatively (for the same results), in a terminal window from within
the GNOME desktop, the following command can be run:
There are no predictable symptoms that would indicate that this issue
has been exploited to execute arbitrary commands with elevated
privileges. The symptom of the Denial of Service (DoS) would be the
absence of either the Xsun(1) or Xorg(1) server running on the system.
To prevent this issue from being exploited to execute arbitrary
commands with elevated privileges, the setuid(2) bit can be removed
from the Xorg server and the Xsun server on the x86 platform and the
setgid(2) bit can be removed from the Xsun server on the SPARC
platform. For example:
# chmod 0755 /usr/openwin/bin/Xsun
# chmod 0755 /usr/X11/bin/Xorg
Note 1: Performing the above procedure will disable the following:
* The ability to start either the Xsun(1) or Xorg(1) server from the
command line for non-root users on the Solaris x86 platform.
* The ability of Xsun(1) and Xorg(1) to open Unix domain sockets and
named pipe transports in the protected "/tmp/.X11-*" directories.
* The ability to configure Power Management and Interactive Process
Priority control on Solaris SPARC.
These features will still be available to Xsun and Xorg when started
via a display manager such as dtlogin(1), gdm(1), or xdm(1).
Note 2: There is no workaround to prevent this issue from being
exploited to cause a Denial Of Service to the X Servers.
Note 3: The "chmod" command for Xorg(1) is applicable only to Solaris
9 and 10.
A final resolution for Solaris is pending completion.
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
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