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RSI.0010.10-21-98.IRIX.AUTOFSD
From: advise () ENIGMA REPSEC COM (RSI Advise)
Date: Wed, 21 Oct 1998 16:07:49 -0700


RSI.0010.10-21-98.IRIX.AUTOFSD



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                   Repent Security Incorporated, RSI
                       [ http://www.repsec.com ]


                       *** RSI ALERT ADVISORY ***


--- [CREDIT] --------------------------------------------------------------

Mark Zielinski : Discovered the vulnerability, author of the advisory


--- [SUMMARY] -------------------------------------------------------------

Announced:     October 2, 1998
Report code:   RSI.0010.10-21-98.IRIX.AUTOFSD
Report title:  IRIX autofsd

Vulnerability: Please see the details section
Vendor status: SGI contacted on October 2, 1998
Patch status:  No patch is currently available

Platforms:     IRIX 6.2, 6.3, 6.4, 6.5

Reference:     http://www.repsec.com/advisories.html
Impact:        If exploited, an attacker could potentially compromise
               root access locally on your server

NOTE:          IRIX versions 5.3, 6.0, and 6.1 were NOT tested, however
               they could be subject to the same vulnerability.


--- [DETAILS] -------------------------------------------------------------

Description:   Autofsd is an RPC server which answers file system mount
               and umount requests from the autofs file system.  It uses
               local files or name service maps to locate file systems to
               be mounted.

Problem:       Users locally on the system can send requests to the
               autofsd daemon and execute arbitrary commands as the
               superuser.

               Upon receiving a map argument from a client,
               the server will attempt to verify if it is executable
               or not.  If autofsd determines the map has an executable
               flag, the server will append the client's key and attempt
               to execute it.

               By sending a map name that is executable on the server,
               and a key beginning with a semicolon or a newline followed
               by a command, unprivileged users can execute arbitrary
               commands as the superuser.

               The problem occurs when the server appends the key
               to the map and attempts to execute it by calling
               popen.

               Since popen executes the map and key you specify by
               invoking a shell, it is possible to force it into executing
               commands that were not meant to be executed.


--- [FIX] -----------------------------------------------------------------

Solution:      Do not run autofsd until a patch is released for the
               version of IRIX you are running.


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

Repent Security Incorporated (RSI)
13610 N. Scottsdale Rd.
Suite #10-326
Scottsdale, AZ 85254

E-Mail: advise () repsec com
FTP: ftp://ftp.repsec.com
WWW: http://www.repsec.com

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Copyright October 1998 RepSec, Inc.

The information in this document is provided as a service to customers
of RepSec, Inc.  Neither RepSec, Inc., nor any of it's employees, makes
any warranty, express or implied, or assumes any legal liability or
responsibility for the accuracy, completeness, or usefulness of any
information, apparatus, product, or process contained herein, or
represents that its use would not infringe any privately owned rights.
Reference herein to any specific commercial products, process, or
services by trade name, trademark, manufacturer, or otherwise, does not
necessarily constitute or imply its endorsement, recommendation or
favoring by RepSec, Inc.  The views and opinions of authors express
herein do no necessarily state or reflect those of RepSec, Inc., and may
not be used for advertising or product endorsement purposes.

The material in this alert advisory may be reproduced and distributed,
without permission, in whole or in part, by other security incident
response teams (both commercial and non-commercial), provided the above
copyright is kept intact and due credit is given to RepSec, Inc.

This alert advisory may be reproduced and distributed, without
permission, in its entirety only, by any person provided such
reproduction and/or distribution is performed for non-commercial
purposes and with the intent of increasing the awareness of the Internet
community.

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

RepSec, Inc. are trademarks of RepSec, Inc.  All other trademarks are
property of their respective holders.



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