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AUSCERT External Security Bulletin Redistribution
ESB-2007.0270 -- [Solaris]
Security Vulnerability in libX11 for Solaris
30 July 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: libX11
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Increased Privileges
Access: Existing Account
CVE Names: CVE-2007-1667
Ref: ESB-2007.0220
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102888-1
Revision History: July 30 2007: Further Patches Released
July 13 2007: Patches Released
April 26 2007: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102888
* Synopsis: Security Vulnerability in libX11 for Solaris
* Category: Security
* Product: Solaris 9 Operating System, Solaris 10 Operating System,
Solaris 8 Operating System
* BugIDs: 6542279
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 24-Apr-2007, 25-Jul-2007
* Date Closed: 25-Jul-2007
* Date Modified: 11-Jul-2007, 25-Jul-2007
1. Impact
A buffer overflow vulnerability in libX11 may allow a local
unprivileged user to be able to execute arbitrary code or commands
with elevated privileges. The code or commands executed would run with
the privileges of the application dynamically linked to the libX11
library. A number of programs shipped in Solaris and by third parties
dynamically link with the libX11 library and run with elevated
privileges. Applications that call XInitImage() with user-controllable
parameters may be vulnerable, such as xwud(1) and ImageMagick, when
loading X Window Dump (xwd) files with incorrect parameters.
This issue is described in the following documents:
CVE-2007-1667 at
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1667
http://lists.freedesktop.org/archives/xorg-announce/2007-April/0002
86.html
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 8 without patch 119067-08
* Solaris 9 without patch 112785-62
* Solaris 10 without patch 119059-26
x86 Platform
* Solaris 8 without patch 119068-08
* Solaris 9 without patch 112786-51
* Solaris 10 without patch 119060-25
Notes:
1) To determine if an application is linked against the libX11
library, the ldd(1) utility can be used as in the following example:
$ ldd /path/to/application | grep libX11 || echo "application not affected"
If output similar to the following is seen:
libX11.so.4 => /usr/openwin/lib/libX11.so.4
then the application links to libX11 and may be affected by this
issue.
2) To determine if an application uses the XInitImage(3X11) function
the nm(1) command can be used if the application binary has not been
stripped using strip(1). The file(1) command will report if a binary
has been stripped. For example:
$ file /usr/openwin/bin/xwud
/usr/openwin/bin/xwud: ELF 32-bit LSB executable 80386 Version 1 [FPU],
dynamically linked, not stripped, no debugging information available
$ nm /usr/openwin/bin/xwud | grep XInitImage
| 134550036| 0|FUNC |GLOB |0 |UNDEF |XInitImage
Alternatively, the truss(1) utility can be used to determine if an
application calls the XInitImage() function. For example:
$ truss -f -t\!all -ulibX11:XInitImage: xwud -in file.xwd
28243/1@1: -> libX11:XInitImage(0x8047888)
28243/1@1: <- libX11:XInitImage() = 1
3. Symptoms
There are no predictable symptoms that would indicate the described
issue has been exploited to execute arbitrary commands with elevated
privileges on a system.
4. Relief/Workaround
To avoid this issue, do not load X11 Window dump files from untrusted
sources.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 8 with patch 119067-08 or later
* Solaris 9 with patch 112785-62 or later
* Solaris 10 with patch 119059-26 or later
x86 Platform
* Solaris 8 with patch 119068-08 or later
* Solaris 9 with patch 112786-51 or later
* Solaris 10 with patch 119060-25 or later
Change History
11-Jul-2007:
* Updated Contributing Factors and Resolution sections
25-Jul-2007:
* Updated Contributing Factors and Resolution sections
* State: Resolved
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 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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