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                           EMERGENCY RESPONSE SERVICE
      OUTSIDE ADVISORY REDISTRIBUTION

16 August 1996 13:00 GMT                         Number: ERS-OAR-E01-1996:018.1
===============================================================================

The IBM-ERS Outside Advisory Redistribution is designed to provide customers
of the IBM Emergency Response Service with access to the security advisories
sent out by other computer security incident response teams, vendors, and
other groups concerned about security.

IBM makes no representations and assumes no responsibility for the contents or
accuracy of the advisories themselves.

IBM-ERS is forwarding the following information from CIAC.  Contact
information for CIAC is included in the forwarded text below; please
contact them if you have any questions or need further information.

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

********************** FORWARDED INFORMATION STARTS HERE **********************

             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

              Linux Vulnerabilities in mount and umount Programs

August 15, 1996 16:00 GMT                                          Number G-38
______________________________________________________________________________
PROBLEM:       A security hole has been identified in the mount and umount
               programs.
PLATFORM:      All systems running current distributions of Linux including
               all versions of Red Hat Linux.
DAMAGE:        This vulnerability may allow any user with an account
               on a system to obtain root access.
SOLUTION:      Read and implement the workaround and/or patches described
               below.
______________________________________________________________________________
VULNERABILITY  This vulnerability is becoming widely known. CIAC recommends
ASSESSMENT:    implementing the workaround and/or patches as soon as possible.
______________________________________________________________________________

The mount and umount programs are normally installed with setUID root to 
allow users to perform mount and unmount operations. However, they do not 
check the length of the information being passed, thereby creating a buffer 
overflow problem.

******************************************************************************
Operating Systems Tested: All current distributions of Linux
******************************************************************************

Effect: Local users on systems affected can gain overflow mounts syntax 
buffer and execute a shell by overwriting the stack.

Effected binaries:
(/bin/mount and /bin/umount)

Workaround:
On all current distributions of Linux remove suid bit of /bin/mount and 
/bin/umount. 
[chmod -s /bin/mount; chmod -s /bin/umount]
******************************************************************************

******************************************************************************
Operating Systems Tested: All versions of Red Hat Linux
******************************************************************************

Users of versions of Red Hat less than 3.0.3 are advised to upgrade to
3.0.3, since many other problems are fixed in the upgrade.

If you are running:
* Red Hat Linux 3.0.3 (Picasso) on the Intel architecture, get
  - ftp://ftp.redhat.com/pub/redhat/redhat-3.0.3/i386/updates/RPMS/
    util-linux-2.5-11fix.i386.rpm
    mount-2.5k-1.i386.rpm
And install them in that order using 'rpm -Uvh [rpm filename]'

* Red Hat Linux 3.0.3 (Picasso) on the Alpha architecture, get
  - ftp://ftp.redhat.com/pub/redhat/redhat-3.0.3/axp/updates/RPMS/
    util-linux-2.5-11fix.axp.rpm
    mount-2.5k-1.axp.rpm
And install them in that order using 'rpm -Uvh [rpm filename]'

* Red Hat Linux 3.0.4 (Rembrandt) beta on the Intel, get
  - ftp://ftp.redhat.com/pub/redhat/rembrandt/i386/updates/RPMS/
    mount-2.5k-2.i386.rpm

* Red Hat Linux 3.0.4 (Rembrandt) beta on the Sparc, get
  - ftp://ftp.redhat.com/pub/redhat/rembrandt/sparc/updates/RPMS/
    mount-2.5k-2.sparc.rpm

[Aside: There is no difference between mount-2.5k-1 and -2 except
the package format.]

All RPMs are PGP-signed with the redhat@redhat.com key.
The source RPMs will be available in the normal locations.

MD5SUM's:
ad9b0628b6af9957d7b5eb720bbe632b  mount-2.5k-1.axp.rpm
12cb19ec4b3060f8d1cedff77bda7c05  util-linux-2.5-11fix.axp.rpm

26506a3c0066b8954d80deff152e0229  mount-2.5k-1.i386.rpm
f48c6bf901dd5d2c476657d6b75b12a5  util-linux-2.5-11fix.i386.rpm

7337f8796318f3b13f2dccb4a8f10b1a  mount-2.5k-2.i386.rpm
e68ff642a7536f3be4da83eedc14dd76  mount-2.5k-2.sparc.rpm

Thanks to Bloodmask, Vio, and others on the BugTraq list for discovering
this hole and providing patches.
******************************************************************************


_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Bloodmask, Vio, Elliot Lee at 
Red Hat, and others on BugTraq for the information contained in this bulletin.
_______________________________________________________________________________

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
    Voice:    +1 510-422-8193
    FAX:      +1 510-423-8002
    STU-III:  +1 510-423-2604
    E-mail:   ciac@llnl.gov

For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 510-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

   World Wide Web:      http://ciac.llnl.gov/
   Anonymous FTP:       ciac.llnl.gov (128.115.19.53)
   Modem access:        +1 (510) 423-4753 (28.8K baud)
                        +1 (510) 423-3331 (28.8K baud)

CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
   information and Bulletins, important computer security information;
2. CIAC-NOTES for Notes, a collection of computer security articles;
3. SPI-ANNOUNCE for official news about Security Profile Inspector
   (SPI) software updates, new features, distribution and
   availability;
4. SPI-NOTES, for discussion of problems and solutions regarding the
   use of SPI products.

Our mailing lists are managed by a public domain software package
called ListProcessor, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
CIAC-BULLETIN, CIAC-NOTES, SPI-ANNOUNCE or SPI-NOTES for list-name and
valid information for LastName FirstName and PhoneNumber when sending

E-mail to       ciac-listproc@llnl.gov:
        subscribe list-name LastName, FirstName PhoneNumber
  e.g., subscribe ciac-notes OHara, Scarlett W. 404-555-1212 x36

You will receive an acknowledgment containing address, initial PIN,
and information on how to change either of them, cancel your
subscription, or get help.

PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins.  If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained by sending email to
docserver@first.org with an empty subject line and a message body
containing the line: send first-contacts.

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
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
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 or the University of California, and shall not be used for
advertising or product endorsement purposes.

*********************** FORWARDED INFORMATION ENDS HERE ***********************

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

IBM's Internet Emergency Response Service (IBM-ERS) is a subscription-based
Internet security response service that includes computer security incident
response and management, regular electronic verification of your Internet
gateway(s), and security vulnerability alerts similar to this one that are
tailored to your specific computing environment.  By acting as an extension
of your own internal security staff, IBM-ERS's team of Internet security
experts helps you quickly detect and respond to attacks and exposures across
your Internet connection(s).

As a part of IBM's Business Recovery Services organization, the IBM Internet
Emergency Response Service is a component of IBM's SecureWay(tm) line of
security products and services.  From hardware to software to consulting,
SecureWay solutions can give you the assurance and expertise you need to
protect your valuable business resources.  To find out more about the IBM
Internet Emergency Response Service, send an electronic mail message to
ers-sales@vnet.ibm.com, or call 1-800-742-2493 (Prompt 4).

IBM-ERS maintains a site on the World Wide Web at http://www.ers.ibm.com/.
Visit the site for information about the service, copies of security alerts,
team contact information, and other items.

IBM-ERS uses Pretty Good Privacy* (PGP*) as the digital signature mechanism for
security vulnerability alerts and other distributed information.  The IBM-ERS
PGP* public key is available from http://www.ers.ibm.com/team-info/pgpkey.html.
"Pretty Good Privacy" and "PGP" are trademarks of Philip Zimmerman.

IBM-ERS is a Member Team of the Forum of Incident Response and Security Teams
(FIRST), a global organization established to foster cooperation and response
coordination among computer security teams worldwide.

The information in this document is provided as a service to customers of
the IBM Emergency Response Service.  Neither International Business Machines
Corporation, Integrated Systems Solutions Corporation, nor any of their
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 service by
trade name, trademark, manufacturer, or otherwise, does not necessarily
constitute or imply its endorsement, recommendation or favoring by IBM or
its subsidiaries.  The views and opinions of authors expressed herein do not
necessarily state or reflect those of IBM or its subsidiaries, and may not be
used for advertising or product endorsement purposes.

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