Date: 10 August 2007
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AUSCERT External Security Bulletin Redistribution
ESB-2007.0565 -- [UNIX/Linux][Solaris]
A Security Vulnerability in lbxproxy(1) may Allow Unauthori
zed Read Access to Files
10 August 2007
AusCERT Security Bulletin Summary
Publisher: Sun Microsystems
Operating System: UNIX variants (UNIX, Linux, OSX)
Solaris 8, 9 and 10
Impact: Access Privileged Data
Access: Existing Account
CVE Names: CVE-2007-4070
Comment: It has not yet been confirmed whether this vulnerability affects
Solaris only, or also affects the upstream X.org and XFree86
lbxproxy programs supplied to other platforms.
System administrators running lbxproxy on other operating systems
may consider restricting access to lbxproxy to trusted users only
until this is resolved.
Revision History: August 10 2007: Added CVE Name
July 27 2007: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102948
* Synopsis: A Security Vulnerability in lbxproxy(1) may Allow
Unauthorized Read Access to Files
* Category: Security
* Product: Solaris 9 Operating System, Solaris 10 Operating System,
Solaris 8 Operating System
* BugIDs: 6473929
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 25-Jul-2007
* Date Closed: 25-Jul-2007
* Date Modified:
A Security Vulnerability in Low Bandwidth X proxy (lbxproxy(1)) may
allow a local unprivileged user, the ability to read some data from
any file that has group ownership of root on the system.
lbxproxy(1) is used for making connections to the X11 Display Server
(Xserver or Xorg) faster over a low bandWidth connection.
Sun acknowledges with thanks, Charles Morris, Old Dominion University,
for discovering and reporting this issue.
2. Contributing Factors
This issue can occur in the following releases:
* Solaris 8 without patch 119067-08
* Solaris 9 without patch 112785-62
* Solaris 10 without patch 119059-28
* Solaris 8 without patch 119068-08
* Solaris 9 without patch 112786-51
* Solaris 10 without patch 119060-27
There are no predictable symptoms that would indicate the described
issue has been exploited.
To work around the described issue until patches can be applied, users
may wish to turn off the set group ID bit for the "lbxproxy" binary.
This can be done by issuing the following command as root user:
# chmod g-s /usr/openwin/bin/lbxproxy
After the set group ID permissions have been removed the "lbxproxy"
command should be run with the "-pn" option so that the program will
continue to run after it fails to establish its well-known sockets and
instead listen for client connections over TCP.
The DISPLAY environment variable should be set using the format of
"hostname:display" instead of just ":display" so that clients will
connect over TCP.
This issue is addressed in the following releases:
* Solaris 8 with patch 119067-08 or later
* Solaris 9 with patch 112785-62 or later
* Solaris 10 with patch 119059-28 or later
* Solaris 8 with patch 119068-08 or later
* Solaris 9 with patch 112786-51 or later
* Solaris 10 with patch 119060-27 or later
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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AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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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
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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