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AUSCERT External Security Bulletin Redistribution
ESB-2007.0275 -- [Solaris]
Multiple vulnerabilities in libfreetype, Xsun(1) and Xorg(1)
28 May 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Xsun
Xorg
libfreetype
Publisher: Sun Microsystems
Operating System: Solaris 8, 9 and 10
Impact: Root Compromise
Access: Remote/Unauthenticated
CVE Names: CVE-2007-1352 CVE-2007-1351 CVE-2007-1003
Ref: ESB-2007.0218
ESB-2007.0246
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102886-1
Comment: Note that the BDF font parsing vulnerability CVE-2007-1351 may
potentially be remotely exploited via several application file
formats which contain embedded fonts that are parsed by FreeType.
Revision History: May 28 2007: Additional patch information has been
included.
May 22 2007: Resolutions are now available
April 27 2007: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102886
* Synopsis: Multiple vulnerabilities in libfreetype, Xsun(1) and
Xorg(1)
* Category: Security
* Product: Solaris 9 Operating System, Solaris 10 Operating System,
Solaris 8 Operating System
* BugIDs: 6526191, 6538280, 6538290, 6539893, 6526192, 6538282,
6538286
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 25-Apr-2007, 25-May-2007
* Date Closed: 25-May-2007
* Date Modified: 18-May-2007, 25-May-2007
1. Impact
Multiple security vulnerabilities exist in the X11 FreeType library
and X11 display servers Xsun(1) and Xorg(1).
The XC-MISC extension is used by the X11 display servers to manage
resource IDs. A local or remote unprivileged user who is able to
display data on a running X11 server instance may be able to elevate
their privileges to root and execute arbitrary code or cause a Denial
of Service (DOS) to that X11 server instance resulting from memory
corruption in ProxXCMiscGetXIDList.
This issue is described in the following documents:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
d=503
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1003
http://lists.freedesktop.org/archives/xorg-announce/2007-April/0002
86.html
The X11 display servers contain a flaw that may allow a local or
remote unprivileged user who is able to display data on a running X11
server instance to elevate their privileges to root and execute
arbitrary code or cause a Denial of Service (DOS) to that X11 server
instance when a BDF font file specifies that there are more then 2^30
characters defined in the font file.
This issue is described in the following documents:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
d=501
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1351
http://lists.freedesktop.org/archives/xorg-announce/2007-April/0002
86.html
The X11 Free Type library and X11 display servers contain a flaw that
may allow a local or remote unprivileged user who is able to display
data on a running X11 server instance to elevate their privileges to
root and execute arbitrary code or cause a Denial of Service (DOS) to
that X11 server instance by causing the server to load a long path
name in the fonts.dir file for a font.
This issue is described in the following documents:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
d=502
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1352
http://lists.freedesktop.org/archives/xorg-announce/2007-April/000
286.html
2. Contributing Factors
These issues can occur in the following releases:
SPARC Platform
* Solaris 8 without patch 119067-07 (for Xsun(1))
* Solaris 9 without patch 112785-61 (for Xsun(1))
* Solaris 10 without patch 119059-25 (for Xsun(1))
* Solaris 10 without patch 119812-03 (for libfreetype)
x86 Platform
* Solaris 8 without patch 119068-07 (for Xsun(1))
* Solaris 9 without patch 112786-50 (for Xsun(1))
* Solaris 9 without patch 124833-02 (for Xorg(1))
* Solaris 10 without patch 119060-24 (for Xsun(1))
* Solaris 10 without patch 125720-03 (for Xorg(1))
* Solaris 10 without patch 119813-04 (for libfreetype)
Note: The Xorg(1) X server only ships on the x86 platform for Solaris
9 with the Sun Java Desktop System (JDS) release 2 installed, and on
Solaris 10.
To determine if JDS release 2 is installed on a Solaris 9 x86 system,
the following command can be run:
% grep distributor-version /usr/share/gnome-about/gnome-version.xml
<distributor-version>Sun Java Desktop System, Release 2</distributor-version>
3. Symptoms
There are no predictable symptoms that would indicate the described
issues have been exploited.
4. Relief/Workaround
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
Similar chmod commands will need to be used on a setuid(2) or
setgid(2) application that links to the Free Type library
(libfreetype). To determine if a setuid(2) or setgid(2) application
links to the Free Type library do the following:
# ldd /usr/bin/fc-cache | grep freetype
libfreetype.so.6 => /usr/sfw/lib/libfreetype.so.6
If the fc-cache application had been setuid(2) or setgid(2) then
performing the chmod commands would be appropriate.
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.
Note 4: Local users on the console of a system using an X display
manager and Sun Ray users may still be able to exploit this
vulnerability to execute arbitrary commands with elevated privileges
even if the setuid and setgid permissions have been removed from the
Xsun and Xorg binaries.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 8 with patch 119067-07 or later (for Xsun(1)
* Solaris 9 with patch 112785-61 or later (for Xsun(1))
* Solaris 10 with patch 119059-25 or later (for Xsun(1))
* Solaris 10 with patch 119812-03 or later (for libfreetype)
x86 Platform
* Solaris 8 with patch 119068-07 or later (for Xsun(1))
* Solaris 9 with patch 112786-50 or later (for Xsun(1))
* Solaris 9 with patch 124833-02 or later (for Xorg(1))
* Solaris 10 with patch 119060-24 or later (for Xsun(1))
* Solaris 10 with patch 125720-03 or later (for Xorg(1))
* Solaris 10 with patch 119813-04 or later (for libfreetype)
Change History
18-May-2007:
* Updated Contributing Factors and Resolution sections
25-May-2007:
* State: Resolved
* Updated Contributing Factors and Resolution sections
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,
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This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
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notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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