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AUSCERT External Security Bulletin Redistribution
ESB-2008.0637 -- [Solaris]
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
15 August 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: FreeType2
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access: Remote/Unauthenticated
CVE Names: CVE-2008-1808 CVE-2008-1807 CVE-2008-1806
Ref: ESB-2008.0599
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-239006-1
Revision History: August 15 2008: Patches Released
June 20 2008: Initial Release
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Solution Type: Sun Alert
Solution 239006 : 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
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
SA Document Body
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:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
d=715
http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
d=716
http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
d=717
CVE-2008-1806 at
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1806
CVE-2008-1807 at
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1807
CVE-2008-1808 at
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1808
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):
$ ldd /usr/bin/fc-cache | grep libfreetype
libfreetype.so.6 => /usr/sfw/lib/libfreetype.so.6
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:
$ pldd `pgrep fc-cache` | grep libfreetype
/usr/sfw/lib/libfreetype.so.6
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 Technical
Instruction ID 213557.
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
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