_____________________________________________________
             The Computer Incident Advisory Capability
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                        /       |     / \   /
                        \___  __|__  /___\  \___
        _____________________________________________________
                         Information Bulletin       

          Patch for TIOCCON in SunOS 4.1 and 4.1.1 Available

December 21, 1990, 0900 PST                              Number B-10

________________________________________________________________________
PROBLEM:  Security problem in the TIOCCON redirection of console input/
   output
PLATFORM:  Sun computer (all architectures) running SunOS versions 4.0.3 
   through 4.1.1 .  
DAMAGE:   Allows misuse of the TIOCCON function 
PATCH: Available through anonymous ftp from ftp.uu.net or from Sun 
   (contact Sun at  1-800-USA4SUN for details).  A patch for SunOS 4.0.3 
   will be available soon.
_______________________________________________________________________
               Critical Facts about the TIOCCON patch 

CIAC has been informed of a problem with the TIOCCON function in SunOS
4.1 and 4.1.1.  Sun Microsystems has developed a patch to close this
vulnerability.  The application of this patch should have no impact on
current applications, i.e., should not cause existing systems to behave
in an anomalous manner.

The patch is available on the Internet using anonymous ftp to the site
ftp.uu.net (ip address 192.48.96.2).  Login with the username anonymous
and use your account name as the password.  The patches are in the
directory ~ftp/sun-dist.  The patch for systems running SunOS 4.1 and
4.1.1 is 100187-01.tar.Z and 100188-01.Z, respectively.  If you do not
have Internet access, you may request the patch from Sun or CIAC.  Call
1-800-USA-4SUN and request patch 100187-01 for SunOS 4.1 and 100188-01
for SunOS 4.1.1.

The patch file available on ftp.uu.net is a compressed tar archive of 5
object files that must be placed in the appropriate directory in
/sys/sun?/OBJ, where sun? is one of sun4, sun4c, sun3, sun3x, or
sun4/490-4.1_PSR_A.  To install the patch, the files must be placed in
this directory and a new kernel must be built.  Once the kernel (file
/vmunix) is replaced with the newly built version, the patch
installation is complete.

Appended to this notice is the original Sun Microsystems security
bulletin concerning this vulnerability.  Please contact CIAC for
assistance.

  Thomas A. Longstaff (415) 423-4416 or (FTS) 543-4416

  or call (415) 422-8193 or (FTS) 532-8193

  Send FAX messages to:  (415) 423-0913 or (FTS) 543-0913

Neither the United States Government nor the University of California
nor any of their employees, makes any warranty,  expressed or implied,
or assumes any legal liability or responsibility for the accuracy,
completeness, or usefulness of any information, product, or process
disclosed, or represents that its use would not infringe privately
owned rights.  Reference herein to any specific commercial products,
process, or service by trade name, trademark manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation, or favoring by the United States Government or the
University of California.  The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government nor the University of California, and shall not be used for
advertising or product endorsement purposes.

Appendix:  SUN MICROSYSTEMS SECURITY BULLETIN:

This information is only to be used for the purpose of alerting
customers to problems. Any other use or re-broadcast of this
information without the express written consent of Sun Microsystems
shall be prohibited.

Sun expressly disclaims all liability for any misuse of this
information by any third party.
-------------------------------------------------------------------------

These patches are available through your local Sun answer centers
worldwide. As well as through anonymous ftp to ftp.uu.net in the
~ftp/sun-dist directory.

Please refer to the BugID and PatchID when requesting patches from Sun
answer centers.

NO README information will be posted in the patch on UUNET. Please refer
the the information below for patch installation instructions.

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

Sun Bug ID   : 1008324
Synopsis     : TIOCCONS redirection of console input/output is a security 
               violation.
Sun Patch ID : for SunOS 4.1, SunOS 4.1_PSR_A 100187-01
Sun Patch ID : for SunOS 4.1.1 100188-01
Available for: Sun3, Sun3x, Sun4 Sun4c
               SunOS 4.1, SunOS 4.1_PSR_A, SunOS 4.1.1
Checksum of compressed tarfile on ftp.uu.net:~ftp/sun-dist

sum of SunOS 4.1 tarfile 100187-01.tar.Z  : 14138   142
sum of SunOS 4.1.1 tarfile 100188-01.tar.Z: 24122   111

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

README information follows:

Patch-ID# 100188-01
Keywords: TIOCCONS
Synopsis: SunOS 4.1.1: TIOCCONS redirection of console is a security violation.
Date: 17/Dec/90
 
SunOS release: 4.1.1
 
Unbundled Product:
 
Unbundled Release:
 
Topic: 
 
BugId's fixed with this patch: 1008324

Architectures for which this patch is available: sun3 sun3x sun4 sun4c

Patches which may conflict with this patch:

Obsoleted by: Next major release of SunOS

Problem Description: TIOCCONS can be used to re-direct console output/input
                     away from "console"


Patch contains kernel object modules for:

/sys/sun?/OBJ/cons.o
/sys/sun?/OBJ/zs_async.o
/sys/sun?/OBJ/mcp_async.o
/sys/sun?/OBJ/mti.o

Where sun? is one of sun4, sun4c, sun3, sun3x, sun4/490-4.1_PSR_A

NOTE: The sun4c does not use mti.o nor mcp_async.o since this
architecture does not have VME slots and therefore cannot use the ALM-2
Asynchronous Line Multiplexor or Systech MTI-800/1600. So those modules
are not needed.

The fix consists of adding permission checking to setcons, the routine
that does the work of console redirection, and changing its callers to
supply additional information required for the check and to see whether
or not the check succeeded.  Setcons now uses uid and gid information
supplied to it as new arguments to perform a VOP_ACCESS call for VREAD
permission on the console.  If the caller doesn't have permission to
read from the console, setcons rejects the redirection attempt.


INSTALL:

AS ROOT:
save aside the object modules from the FCS tapes as a precaution:

# mv /sys/sun?/OBJ/cons.o /sys/sun?/OBJ/cons.o.orig
# mv /sys/sun?/OBJ/tty_pty.o /sys/sun?/OBJ/tty_pty.o.orig
# mv /sys/sun?/OBJ/zs_async.o /sys/sun?/OBJ/zs_async.o.orig
# mv /sys/sun?/OBJ/mcp_async.o /sys/sun?/OBJ/mcp_async.o.orig
# mv /sys/sun?/OBJ/mti.o /sys/sun?/OBJ/mti.o.orig

copy the new ".o" files to the OBJ directory:

# cp sun?/*.o /sys/sun?/OBJ/

build and install a new kernel:
rerun /etc/config <kernel-name> and do a "make" for the new kernel
Please refer to the System and Network Administration Manual for details
on how to configure and install a custom kernel.
 


-------------------------------------------------------------------------
Patch-ID#  100187-01
Keywords: TIOCCONS
Synopsis: SunOS 4.1 4.1_PSR_A: TIOCCONS redirection of console is a 
          security violation.
Date: 17/Dec/90
 
SunOS release: 4.1 4.1_PSR_A
 
Unbundled Product:
 
Unbundled Release:
 
Topic: 
 
BugId's fixed with this patch: 1008324

Architectures for which this patch is available: sun3 sun3x sun4 sun4c
                                                 sun4-490_4.1_PSR_A 

Patches which may conflict with this patch:

Obsoleted by: Next major release of SunOS

Problem Description: TIOCCONS can be used to re-direct console output/
                     input away from "console"


Patch contains kernel object modules for:

/sys/sun?/OBJ/cons.o
/sys/sun?/OBJ/zs_async.o
/sys/sun?/OBJ/mcp_async.o
/sys/sun?/OBJ/mti.o

Where sun? is one of sun4, sun4c, sun3, sun3x, sun4/490-4.1_PSR_A

NOTE: The sun4c does not use mti.o nor mcp_async.o since this
architecture does not have VME slots and therefore cannot use the ALM-2
Asynchronous Line Multiplexed or Systech MTI-800/1600. So those modules
are not needed.

The fix consists of adding permission checking to setcons, the routine
that does the work of console redirection, and changing its callers to
supply additional information required for the check and to see whether
or not the check succeeded.  Setcons now uses uid and gid information
supplied to it as new arguments to perform a VOP_ACCESS call for VREAD
permission on the console.  If the caller doesn't have permission to
read from the console, setcons rejects the redirection attempt.

INSTALL:

AS ROOT:
save aside the object modules from the FCS tapes as a precaution:

# mv /sys/sun?/OBJ/cons.o /sys/sun?/OBJ/cons.o.orig
# mv /sys/sun?/OBJ/tty_pty.o /sys/sun?/OBJ/tty_pty.o.orig
# mv /sys/sun?/OBJ/zs_async.o /sys/sun?/OBJ/zs_async.o.orig
# mv /sys/sun?/OBJ/mcp_async.o /sys/sun?/OBJ/mcp_async.o.orig
# mv /sys/sun?/OBJ/mti.o /sys/sun?/OBJ/mti.o.orig

copy the new ".o" files to the OBJ directory:

# cp sun?/*.o /sys/sun?/OBJ/

build and install a new kernel:
rerun /etc/config <kernel-name> and do a "make" for the new kernel
Please refer to the System and Network Administration Manual for
details on how to configure and install a custom kernel.