Bug Id
6714118

Product
Solaris 8 Operating System
Solaris 9 Operating System
Solaris 10 Operating System
OpenSolaris

Date of Workaround Release
18-Jun-2008

Date of Resolved Release
12-Aug-2008

Multiple Security Vulnerabilities in the FreeType2 library for Printer Font Binary (PFB) or TrueType Font (TTF) format font files may lead to a Denial of Service (DoS) or allow Execution of Arbitrary Code

1. Impact

Multiple security vulnerabilities exist in the FreeType 2 library in Solaris when parsing Printer Font Binary (PFB) or TrueType Font (TTF) format font files. These vulnerabilites may allow a local unprivileged user to either cause an application using FreeType 2 as a font service to crash or to execute arbitrary commands with the privileges of the application. The ability to crash an application is a type of Denial of service (DoS).

These issues are described in the following documents:


2. Contributing Factors

These issues can occur in the following releases:

SPARC Platform

• Solaris 8 without patch 124420-04
• Solaris 9 without patch 116105-09
• Solaris 10 without patch 119812-06
• OpenSolaris based upon builds snv_01 through snv_92

x86 Platform

• Solaris 8 without patch 124421-04
• Solaris 9 without patch 116106-08
• Solaris 10 without patch 119813-08
• OpenSolaris based upon builds snv_01 through snv_92

Notes:

1. Only OpenSolaris installations including the affected binary "/usr/lib/libfreetype.so.6" are impacted by this issue.

2. OpenSolaris distributions may include additional bug fixes above and beyond the base build from which it was derived.  The base build can be derived as follows:

$ uname -a
SunOS osolsys 5.11 snv_86 i86pc i386 i86pc

3. Applications are impacted only if they link to the FreeType 2 library (libfreetype). A partial test to check if an application links with a library such as libfreetype is to use ldd(1):


4. A comprehensive test to check if an application links with a library such as libfreetype requires the use of pldd(1) against the running application since ldd(1) does not list any shared objects explicitly attached using dlopen(3C). For example:


3. Symptoms

There are no predictable symptoms that would indicate that these issues have been exploited to execute arbitrary code.

4. Workaround

The Xorg(1) X server is a privileged application available in OpenSolaris, Solaris 10, and Solaris 9 (x86 systems only) which links to the libfreetype library.  In order to prevent these issues from being exploited against the Xorg(1) X server to execute arbitrary commands with the privileges of the Xorg(1) X server, the setuid(2) bit on x86 systems and the setgid(2) bit on SPARC systems can be removed. For example:

# chmod 0755 /usr/X11/bin/Xorg

On x86 systems running Solaris 10 Update 4 or later:

# chmod 0755 /usr/X11/bin/i386/Xorg /usr/X11/bin/amd64/Xorg

Similar chmod(1) commands can be applied on any setuid(2) or setgid(2) application that links to the Free Type library (libfreetype).

Note 1: Removing the setuid(2) bit or the setgid(2) bit from the Xorg binary will disable the following:

• The ability to start the Xorg(1) server from the command line for non-root users on Solaris 10.
• The ability of Xorg(1) to open Unix domain sockets and named pipe transports in the protected "/tmp/.X11-*" directories.

These features will still be available to Xorg when started via a display manager such as dtlogin(1), gdm(1), or xdm(1).

Note 2: There is no workaround to prevent these issues from being exploited to cause a Denial of Service to the X Server.

Note 3: Local users on the console of a system using an X display manager and Sun Ray users may still be able to exploit these vulnerabilities to execute arbitrary commands with elevated privileges even if the setuid(2) and setgid(2) permissions have been removed from the Xorg(1) binary.

5. Resolution

These issues are addressed in the following releases:

SPARC Platform

• Solaris 8 with patch 124420-04 or later
  
• Solaris 9 with patch 116105-09 or later
  
• Solaris 10 with patch 119812-06 or later
• OpenSolaris based upon build snv_93 or later
  

x86 Platform

• Solaris 8 with patch 124421-04 or later
  
• Solaris 9 with patch 116106-08 or later
  
• Solaris 10 with patch 119813-08 or later
• OpenSolaris based upon build snv_93 or later

For more information on Security Sun Alerts, see 1009886.1.

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, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements.

Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.

Modification History
12-Aug-2008: Updated Contributing Factors and Resolution sections; now Resolved

References

119812-06
119813-08
116105-09
116106-08
124420-04
124421-04





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