Sun Security Bulletin #00140

[secure () SUNSC ENG SUN COM (Sun Security Coordination Team)]

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                   Sun Microsystems, Inc. Security Bulletin

Bulletin Number:        #00140
Date:                   14 May 1997
Cross-Ref:              AUSCERT AA-97.06
Title:                  Vulnerability in ffbconfig
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1.  Bulletins Topics

    Sun announces the release of patches for Solaris 2.5.1 (SunOS 5.5.1) and
    Solaris 2.5 (SunOS 5.5) that relate to vulnerabilities in the ffbconfig
    program, which can result in root access if exploited.

    Sun strongly recommends that you install these patches immediately on
    every affected system. Exploitation information for ffbconfig is publicly
    available.

2.  Who is Affected

       Vulnerable:  SunOS versions 5.5.1 and 5.5 SPARC running the Creator
                    FFB Graphics Accelerator.
                    See section 4. Understanding the Vulnerability, for a way
                    to test if a system is affected.


       Not vulnerable:  All other supported versions of SunOS

       This vulnerability does not exist in the upcoming release of Solaris 2.6.

3.  What to Do

    Install the patches listed in 5.

4.  Understanding the Vulnerability

    The ffbconfig program configures the Creator Fast Frame Buffer (FFB)
    Graphics Accelerator, which is part of the FFB Configuration Software
    Package, SUNWffbcf. This software is used when the FFB Graphics accelerator
    card is installed. Due to insufficient bounds checking on arguments, it is
    possible to overwrite the internal stack space of the ffbconfig program.
    If exploited, this vulnerability can be used to gain root access on
    attacked systems.

    To test if a system is vulnerable, run the following command to check for
    the presence of SUNWffbcf package which is installed when the FFB Graphics
    accelerator card is present:

                /usr/bin/pkginfo -l SUNWffbcf

    If it is not present, you will get an error message stating that SUNWffbcf
    was not found. If it is present, ffbconfig is installed in /usr/sbin.

5.  List of Patches

    The vulnerability relating to ffbconfig is fixed by the following patches:

        OS version              Patch ID
        ----------              --------
        SunOS 5.5.1             103796-09
        SunOS 5.5               103076-09

    The above-mentioned patches are listed in the Graphics section under
    Unbundled Products at

        ftp://sunsolve1.sun.com/pub/patches/patches.html.

6.  Checksum Table

    The checksum table below shows the BSD checksums (SunOS 5.x: /usr/ucb/sum),
    SVR4 checksums (SunOS 5.x: /usr/bin/sum), and the MD5 digital signatures
    for the above-mentioned patches that are available from:

        ftp://sunsolve1.sun.com/pub/patches/patches.html

    These checksums may not apply if you obtain patches from your answer
    centers.

File Name         BSD          SVR4         MD5
---------------   ---------    ---------    --------------------------------
103796-09.tar.Z   37854 2479   55959 4957   4994176B4C03215BD2707B87921C5096
103076-09.tar.Z   33438 2435   42064 4869   0A8AA3C106C4F09448220C1B0B714CD1

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Sun acknowledges with thanks CERT/CC and AUSCERT for their assistance in the
preparation of this bulletin.

Sun, CERT/CC, and AUSCERT are members of FIRST, the Forum of Incident Response
and Security Teams. For more information about FIRST, visit the FIRST web site
at "http://www.first.org/";.
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APPENDICES

A.  Patches listed in this security bulletin are available to all Sun customers
    via World Wide Web at:

        ftp://sunsolve1.sun.com/pub/patches/patches.html

    Customers with Sun support contracts can also obtain patches from local
    Sun answer centers and SunSITEs worldwide.

B.  To report or inquire about a security problem with Sun software, contact
    one or more of the following:

        - Your local Sun answer centers
        - Your representative computer security response team, such as CERT
        - Sun Security Coordination Team. Send email to:

                security-alert () sun com

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