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96-02

96-02
Posted Sep 23, 1999

96-02

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96-02

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EMERGENCY RESPONSE SERVICE
OUTSIDE ADVISORY REDISTRIBUTION

17 July 1996 18:00 GMT Number: ERS-OAR-E01-1996:002.1
===============================================================================

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 the CERT Coordination
Center. Contact information for CERT Coordination Center is included in the
forwarded text below; please contact them if you have any questions or need
further information.

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

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

=============================================================================
CERT(sm) Advisory CA-96.13
July 9, 1996

Topic: Vulnerability in the dip program

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

The CERT Coordination Center has received several reports of exploitations of
a vulnerability in the dip program on Linux systems. The dip program is
shipped with most versions of the Linux system; and versions up to and
including version 3.3.7n are vulnerable. An exploitation script for Linux
running on X86-based hardware is publicly available. Although exploitation
scripts for other architectures and operating systems have not yet been found,
we believe that they could be easily developed.

The CERT Coordination Center recommends that you disable dip and re-enable it
only after you have installed a new version. Section III below describes how
to do that.

As we receive additional information relating to this advisory, we
will place it in

ftp://info.cert.org/pub/cert_advisories/CA-96.13.README

We encourage you to check our README files regularly for updates on
advisories that relate to your site.

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

I. Description

dip is a freely available program that is included in most distributions
of Linux. It is possible to build it for and use it on other UNIX systems.

The dip program manages the connections needed for dial-up links such
as SLIP and PPP. It can handle both incoming and outgoing connections.
To gain access to resources it needs to establish these IP connections,
the dip program must be installed as set-user-id root.

A vulnerability in dip makes it possible to overflow an internal buffer
whose value is under the control of the user of the dip program. If this
buffer is overflowed with the appropriate data, a program such as a
shell can be started. This program then runs with root permissions on the
local machine.

Exploitation scripts for dip have been found running on Linux systems for
X86 hardware. Although exploitation scripts for other architectures
and operating systems have not yet been found, we believe that they could
be easily developed.

II. Impact

On a system that has dip installed as set-user-id root, anyone with
access to an account on that system can gain root access.

III. Solution

Follow the steps in Section A to disable your currently installed version
of dip. Then, if you need the functionality that dip provides, follow the
steps given in Section B.

A. Disable the presently installed version of dip.
As root,
chmod 0755 /usr/sbin/dip

By default, dip is installed in the /usr/sbin directory. Note that it
may be installed elsewhere on your system.


B. Install a new version of dip.
If you need the functionality that dip provides, retrieve and install
the following version of the source code for dip, which fixes this
vulnerability. dip is available from

ftp://sunsite.unc.edu/pub/Linux/system/Network/serial/dip/dip337o-uri.tgz
ftp://sunsite.unc.edu/pub/Linux/system/Network/serial/dip/dip337o-uri.tgz.sig

MD5 (dip337o-uri.tgz) = 45fc2a9abbcb3892648933cadf7ba090
SHash (dip337o-uri.tgz) = 6e3848b9b5f9d5b308bbac104eaf858be4dc51dc

---------------------------------------------------------------------------
The CERT Coordination Center staff thanks Uri Blumenthal for his solution to
the problem and Linux for their support in the development of this advisory.
---------------------------------------------------------------------------

If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident
Response and Security Teams (FIRST).

We strongly urge you to encrypt any sensitive information you send by email.
The CERT Coordination Center can support a shared DES key and PGP. Contact
the CERT staff for more information.

Location of CERT PGP key
ftp://info.cert.org/pub/CERT_PGP.key

CERT Contact Information
------------------------
Email cert@cert.org

Phone +1 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30-5:00 p.m. EST
(GMT-5)/EDT(GMT-4), and are on call for
emergencies during other hours.

Fax +1 412-268-6989

Postal address
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890
USA

CERT publications, information about FIRST representatives, and other
security-related information are available for anonymous FTP from
http://www.cert.org/
ftp://info.cert.org/pub/

CERT advisories and bulletins are also posted on the USENET newsgroup
comp.security.announce

To be added to our mailing list for CERT advisories and bulletins, send your
email address to
cert-advisory-request@cert.org


Copyright 1996 Carnegie Mellon University
This material may be reproduced and distributed without permission provided
it is used for noncommercial purposes and the copyright statement is
included.

CERT is a service mark of Carnegie Mellon University.


This file: ftp://info.cert.org/pub/cert_advisories/CA-96.13.dip_vul
http://www.cert.org
click on "CERT Advisories"

*********************** 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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