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S-93-24.asc
Posted Jan 10, 2000

Subject Xterm Loging vulnerability Date 15-Nov-93

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===============================================================================
>> CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl. Links <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>> <<
>> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the <<
>> complete CERT-CC advisory texts: http://www.cert.org <<
===============================================================================
===============================================================================
Security Advisory CERT-NL
===============================================================================
Author/Source : CERT-NL (Rene Ritzen) Index : S-93-24
Distribution : World Page : 1
Classification: External Version: Final
Subject : Xterm Loging vulnerability Date : 15-Nov-93
==============================================================================

CERT-NL received information about a general Xterm vulnerability.

We advise you to carefully read this advisory and take appropriate action.

In the below CERT/CC report all details are shown.

We thank CERT/CC for providing this information.

==============================================================================

The CERT Coordination Center is working on eliminating a vulnerability in
xterm. This vulnerability potentially affects all systems running xterm
with the setuid or setgid bit set. This vulnerability has been found in
X Version 11, Release 5 (X11R5) and earlier versions of X11.

CERT is working with the vendor community to address this vulnerability.

- -----------------------------------------------------------------------------

I. Description

A vulnerability in the logging function of xterm exists in many
versions of xterm that operate as a setuid or setgid process. The
vulnerability allows local users to create files or modify any
existing files.

If the setuid or setgid privilege bit is not set on the xterm program,
the vulnerability cannot be exploited.

It is possible that the xterm on your system does not allow
logging. In this case, the vulnerability cannot be exploited. To
determine if logging is enabled, run xterm with the "-l" option. If
an "XtermLog.axxxx" file is created in the current directory, xterm
supports logging. You can also check the output of "xterm -help"
to see whether the "-l" option is described as "not supported".

Another way to determine if logging is available is to look for
the "Log to File" item in the Main Options menu (press Control mouse
button 1). If the X Consortium's public patch has been installed
as distributed, the option "Log to File" should not appear in the
menu.


II. Impact

This vulnerability allows anyone with access to a user account
to gain root access.


III. Solutions

All of the following solutions require that a new version of xterm be
installed. When installing the new xterm, it is important either to
remove the old version of xterm or to clear the setuid and setgid
bits from the old xterm.

CERT suggests one of the following solutions.

A. Install vendor supplied patch if available. CERT is hopeful
that patches will be forthcoming. We will be maintaining a
status file, xterm-patch-status, and we will add patch availability
information to this file as it becomes known. The file is
available via anonymous FTP from info.cert.org. The name of
the file is pub/cert_advisories/xterm-patch-status. A current
version of this file is appended to this Advisory.

For more up-to-date information, contact the vendor.

B. If your site is using the X Consortium's X11R5, install the
public patch #26. This patch is available via anonymous FTP
from ftp.x.org as the file /pub/R5/fixes/fix-26. Install all
patch files up to and including fix-26.

By default, the patch disables logging. If you choose to enable
logging, a variation of the vulnerability still exists.

Checksum information:

BSD Unix Sum: 19609 47

System V Sum: 51212 94

MD5 Checksum: e270560b6e497a0a71881d4ff4db8c05

C. If your site is using an earlier version of the X Consortium's X11,
upgrade to X11R5. Install all patches up to and including fix-26.

D. If you are unable to upgrade to the X Consortium's X11R5, modify
the xterm source code to remove the logging feature. Familiarity
with X11 and its installation and configuration is recommended
before implementing these modifications.

- ---------------------------------------------------------------------------
The CERT Coordination Center wishes to thank Stephen Gildea of the X
Consortium for his assistance in responding to this problem.
- ---------------------------------------------------------------------------

CERT Coordination Center
xterm Vendor Status
November 11, 1993


This file is a supplement to the CERT Advisory CA-93:17 of November 11, 1993,
and will be updated as additional information becomes available.

The following is vendor-supplied information. The CERT Coordination Center
will not formally review, evaluate, or endorse this information. For more
up-to-date information, contact your vendor.

It is important to note that the vendor of your xterm may not be the same
as the vendor of your platform. You should take care to correctly identify
the vendor whose xterm you are using, so you can take the appropriate action.



Convex Fixed in CXwindows V3.1. Fixed in CXwindows V3.0
with TAC patch V3.0.131 applied. The Convex Technical
Assistance Center is available for additional information
at 800-952-0379.

Cray Fixed. Contact Cray for version/patch numbers.

DEC/OSF Attached is the information on the remedial images to
address the xterm issue for ULTRIX V4.3 (VAX & RISC)
OSF/1 V1.2. The solutions have been included in
ULTRIX V4.4 (VAX & RISC) and OSF/1 V1.3.

Customers may call their normal Digital Multivendor
Customer Services Support Channel to obtain this kit.

----------------------------------------------------------
*ULTRIX,OSF/1] CSCPAT_4034 xterm Security Fix ECO Summary
COPYRIGHT (c) 1988, 1993 by Digital Equipment Corporation.
ALL RIGHTS RESERVED.

COMPONENT: xterm

OP/SYS: ULTRIX VAX and RISC, OSF/1

SOURCE: Digital Customer Support Center

ECO INFORMATION:

CSCPAT Kit: CSCPAT_4034 V1.1
CSCPAT Kit Size: 2152 blocks
Engineering Cross Reference: SSRT93-E-0230, SSRT93-E-0231,
SSRT93-E-232
Kit Applies To: ULTRIX V4.3, OSF/1 V1.2
System Reboot Required: NO
----------------------------------------------------------

SCO The current releases listed below are not vulnerable to
this problem. No xterm logging or scoterm logging is
provided:

SCO Open Desktop Lite, Release 3.0
SCO Open Desktop, Release 3.0
SCO Open Server Network System, Release 3.0
SCO Open Server Enterprise System, Release 3.0

Contact SCO for any further information.

Sequent Fixed. Contact Sequent for version/patch numbers.

Sun Sun's version of xterm has not been setuid root since at
least as far back as SunOS 4.1.1, and probably further.
An xterm that does not run setuid or setgid is not
vulnerable to the xterm logging problem.

CAUTION: A Sun patch was issued on December 6, 1992 to give
system administrators the option of running xterm setuid
root. Installing this patch will introduce the xterm
logging vulnerability. So check your xterm. If either
the setuid or setgid privilege bit is set on the xterm
program, the vulnerability can be exploited. Contact
Sun for further information.

X.org (Publicly distributed version of X.) You can patch X11R5
by applying all patches up to and including fix-26. See
the associated CERT-NL Advisory (S-93-24) for further
information.

==============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

Email: cert-nl@surfnet.nl ATTENDED REGULARLY ALL DAYS
Phone: +31 302 305 305 BUSINESS HOURS ONLY
Fax: +31 302 305 329 BUSINESS HOURS ONLY
Snailmail: SURFnet bv
Attn. CERT-NL
P.O. Box 19035
NL - 3501 DA UTRECHT
The Netherlands

NOODGEVALLEN: 06 22 92 35 64 ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64 ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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