N-110: Red Hat Updated XFree86 Packages Provide Security and Bug Fixes

N-110: Red Hat Updated XFree86 Packages Provide Security and Bug Fixes Privacy and Legal Notice INFORMATION BULLETIN N-110: Red Hat Updated XFree86 Packages Provide Security and Bug Fixes [Red Hat Security Advisory RHSA-2003:067-16] June 25, 2003 21:00 GMT
[REVISED 28 July 2003]


PROBLEM:	There are a number of security vulnerabilities in XFree86: Xterm - An attacker can craft an escape sequence that sets the victim's Xterm window title to an arbitrary command, and then reports it to the command line. It is possible to lock up versions of Xterm by sending an invalid DEC UDK escape sequence. The xdm display manager, with the authComplain variable set to false, allows arbitrary attackers to connect to the X server if the xdm auth directory does not exist. XFree86 4.2.1 has a vulnerability in the MIT-SHM extension of the X server that allows local users to read and write arbitrary shared memory. The X server was setting the /dev/dri directory permissions incorrectly, which resulted in the directory being world writable. Numerous driver updates and fixes.
SOFTWARE:	Red Hat Linux 7.1 Red Hat Linux 7.2 Red Hat Linux 7.3 Red Hat Linux 8.0
DAMAGE:	The most serious of these vulnerabilities may allow an attacker to run arbitrary commands on the command line.
SOLUTION:	Apply patches as stated in Red Hat's security advisories.

VULNERABILITY ASSESSMENT:	The risk is LOW. A local account to a machine is required to launch this type of attack. An attacker will have to entice a user to press Enter for the shell to process the title as a command.

LINKS:
CIAC BULLETIN:	http://www.ciac.org/ciac/bulletins/n-110.shtml
ORIGINAL BULLETIN:	https://rhn.redhat.com/errata/RHSA-2003-067.html
ADDITIONAL LINKS:	RED HAT LINUX 7.1 & 7.2 - https://rhn.redhat.com/errata/RHSA-2003-064.html RED HAT LINUX 7.3 - https://rhn.redhat.com/errata/RHSA-2003-066.html SUN LINUX 5.0 and SRPM fixes - http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F55602&zone_32=category%3Asecurity

REVISION HISTORY:
7/28/2003 - Added link to Sun's Alert #55602.   

[***** Start Red Hat Security Advisory RHSA-2003:067-16 *****]

Updated XFree86 packages provide security and bug fixes

Advisory: RHSA-2003:067-16 
Last updated on: 2003-06-25 
Affected Products: Red Hat Linux 8.0 
CVEs (cve.mitre.org): CAN-2001-1409
CAN-2002-0164
CAN-2002-1472
CAN-2003-0063
CAN-2003-0071
 
Security Advisory 

Details:

Updated XFree86 packages for Red Hat Linux 8.0 are now available which
include several security fixes, bug fixes, enhancements, and driver
updates.

XFree86 is an implementation of the X Window System providing the core
graphical user interface and video drivers in Red Hat Linux. 

A number of security vulnerabilities have been discovered in XFree86 4.2.0:

- Xterm, provided as part of the XFree86 packages, provides an escape
sequence for reporting the current window title. This escape sequence
essentially takes the current title and places it directly on the command
line. An attacker can craft an escape sequence that sets the victim's Xterm
window title to an arbitrary command, and then reports it to the command
line. Since it is not possible to embed a carriage return into the window
title, the attacker would then have to convince the victim to press Enter
for the shell to process the title as a command, although the attacker
could craft other escape sequences that might convince the victim to do so.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2003-0063 to this issue.

- It is possible to lock up versions of Xterm by sending an invalid DEC
UDK escape sequence. (CAN-2003-0071)

- XFree86 4.2.1 also contains an updated fix for CAN-2002-0164, a
vulnerability in the MIT-SHM extension of the X server that allows local
users to read and write arbitrary shared memory. The original fix did not
cover the case where the X server is started from xdm.

- The X server was setting the /dev/dri directory permissions incorrectly,
which resulted in the directory being world writable. It now sets the
directory permissions to a safe value. (CAN-2001-1409)

Driver updates and additions:

- Savage driver updated to Tim Roberts' latest version 1.1.27t.

- Added new "cyrix" driver from Alan Cox, which works much better on
MediaGX hardware.

- Added new input drivers from Alan Cox for Fujitsu Stylistic (fpit),
Palmax PD1000/PD1100 Input driver (palmax), Union Reality UR-98
head tracker (ur98)

- Backported apm driver from XFree86 CVS, DPMS support enhancements, and a 
few accel fixes

- Backported ark driver from XFree86 CVS

- Backported chips driver from XFree86 CVS, with hardware mouse
cursor and 2D accleration fixes.

- Backported cirrus i740, siliconmotion, and ark drivers from XFree86 CVS

Various bug fixes and enhancements:

- Bug fixes for the RENDER extension and libraries which improve stability

- Various fixes to the Xaw library

- A long standing problem in the X server has been fixed in which 
the mouse, keyboard, or video would hang, or the server to go into an 
endless loop whenever the system time was changed backward while X was 
running

- Fixed a bug in both the Radeon and Rage 128 drivers which caused
crashes while using VMware with DGA when DRI is enabled

- The Matrox "mga" driver had some problems with multihead and the RENDER
extension which have been worked around.

- fc-cache is now run upon font package installation in all font
directories containing fonts managed by fontconfig/Xft

- mkfontdir has been modified to force the permissions of the files it
generates to be mode 0644 ensuring they are world readable independant of
umask.

- Added a new option "ForceLegacyCRT" to the radeon driver to allow use 
of legacy VGA monitors which can not be detected automatically. This 
option is only safe to use in single-head setups and may cause serious 
problems if used with dual-head.

- xterm session management is now enabled by default, whereas the stock
XFree86 default in 4.2.0/4.2.1 was accidentally disabled upstream

- Removed and obsoleted the XFree86-xtrap-clients package, and merged it
into the main XFree86 package to simplify packaging

There are various other fixes included which users can review by examining
the RPM package changelog of any of the new XFree86 packages.

Users are advised to upgrade to these updated XFree86 4.2.1 packages, which
are not vulnerable to the previously mentioned security issues.

Updated packages:

Red Hat Linux 8.0 

--------------------------------------------------------------------------------
 
SRPMS: 
XFree86-4.2.1-20.src.rpm
[ via FTP ] [ via HTTP ]     d8b6c711331c631c3d8aca71a596fa5f 
  
i386: 
XFree86-100dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     9159c60bdcdba1ae7e0c0599e0eaef5f 
XFree86-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     68ff4023c81b59621ccc2c1fcd6c50f3 
XFree86-75dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     75ab424da96097c2e15437364efbd5d5 
XFree86-base-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     501ab86d7597f9f2378dce40dd7146fd 
XFree86-cyrillic-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     38f584b4b9e6a6a501ae323bbf366c2c 
XFree86-devel-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     be757f89eb5ffe6903b35213b222e09c 
XFree86-doc-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     c32f8893dd354cdaca7e20be56bc5290 
XFree86-font-utils-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     77ebf291729828fe129a2f394e00bf06 
XFree86-ISO8859-15-100dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     34d8c4e9e02fc0b3bec18fe7080cfcb9 
XFree86-ISO8859-15-75dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     0fb379911ca8f18c7c7ee79900d7ff0d 
XFree86-ISO8859-2-100dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     882bcdee8965ff1c48e27b7394dc2693 
XFree86-ISO8859-2-75dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     3760aa56f6369543664842f0e4900a93 
XFree86-ISO8859-9-100dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     75213bdae918d3419e6711a0afe485b1 
XFree86-ISO8859-9-75dpi-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     0379dad294ff892af81445f80d8fd5d8 
XFree86-libs-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     41f2f99950f65bfe0528e00a6c6aa1fa 
XFree86-Mesa-libGL-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     b55013e1ea311922ceeb729ee87616cb 
XFree86-Mesa-libGLU-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     4b2304052a6ef52e315e7d13044607df 
XFree86-tools-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     e8f4052121e7bd18494311614e14a759 
XFree86-truetype-fonts-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     4b01bcb29d802e023ab703cd11a3cfb9 
XFree86-twm-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     1cc9502e9a0e1526edd58e0aed2cd31c 
XFree86-xauth-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     6bedb659afe1d73e50dade694a0a8157 
XFree86-xdm-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     e9a20db35fc1bb1053b664afa8fbc1ed 
XFree86-xfs-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     259c43f6d24e109154a989147571e7ce 
XFree86-Xnest-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     b6671415b3cfbdd9e6bf8b46e7375fcf 
XFree86-Xvfb-4.2.1-20.i386.rpm
[ via FTP ] [ via HTTP ]     2dac01365800f3d00135dc1f357a43b3 

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Bugs fixed:  (see bugzilla for more information)

63509 - mouse event problems after system standby
69978 - Radeon failure with old VGA monitor
72297 - MediaGX 5530 XFree86 failure
73678 - Screen corruption when running full-screen VMware under DRI-enabled XFree86
75155 - lndir doesn't work with relative symlink
76154 - Mozilla with xft crashes on Red Hat 8.0 (Xrender bug)
77542 - XFree86-truetype-fonts does integrate with Xft/fontconfig
77930 - rhPrintOSKernelString can print stack garbage
78804 - Xutf8LookupString fails in UTF-8 locale if X server lacks XKB support
79488 - XKeysymDB is included in XFree86.rpm whereas it should be in XFree86-libs.rpm
83303 - Unresolved DRM symbols in r128 driver (4.2.1)
84036 - xauth can write incomplete .xauth files
88773 - xterm session management is disabled by default in XFree86 4.2.x

References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1409
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0164
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1472
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0063
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0071

--------------------------------------------------------------------------------
The listed packages are GPG signed by Red Hat, Inc. for security. Our key is 
available at:
http://www.redhat.com/solutions/security/news/publickey/#key

You can verify each package and see who signed it with the following command:

rpm --checksig -v filename 

If you only wish to verify that each package has not been corrupted or tampered 
with, examine only the md5sum with the following command:

md5sum filename 

The Red Hat security contact is security@redhat.com. More contact details at 
http://www.redhat.com/solutions/security/news/contact.html

[***** End Red Hat Security Advisory RHSA-2003:067-16 *****]

CIAC wishes to acknowledge the contributions of Red Hat, Inc. for the information contained in this bulletin.

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