Sun Information for VU#484011

Solaris Line Printer Daemon (in.lpd) vulnerable to buffer overflow via transfer job routine

Status

Affected

Vendor Statement

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________________________________________________________________________________
                   Sun Microsystems, Inc. Security Bulletin

Bulletin Number:          #00206
Date:                     August 30, 2001
Cross-Ref:                CERT Advisory CA-2001-15
Title:                    in.lpd
________________________________________________________________________________

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________________________________________________________________________________

1.  Bulletins Topics

    Sun announces the release of patches for Solaris(tm) 8, 7, and
   2.6 (SunOS(tm) 5.8, 5.7, and 5.6) which relate to an in.lpd
   vulnerability reported in CERT CA-2001-15.

    Sun recommends that you install the patches listed in section 4
   immediately on systems running SunOS 5.8, 5.7, and 5.6 which
   use in.lpd.

2.  Who is Affected

    Vulnerable:                SunOS 5.8, 5.8_x86, 5.7, 5.7_x86, 5.6,
                              5.6_x86

3.  Understanding the Vulnerability

    The in.lpd daemon is the BSD print protocol daemon.  The in.lpd
   daemon implements the network listening service for the BSD
   print protocol specified in RFC 1179.  The BSD print protocol
   provides a remote interface for systems to interact with a
   local spooling system. CERT Advisory CA-2001-15 describes a
   buffer overflow in the in.lpd daemon which may crash in.lpd or
   allow arbitrary code to be executed with elevated privileges
   on the victim system. The issue was discovered by ISS X-Force
   who published an advisory at:

    http://xforce.iss.net/alerts/advise80.php

    CERT Advisory CA-2001-15 is available from:

    http://www.cert.org/advisories/CA-2001-15.html

4.  List of Patches

    The following patches are available in relation to the above problem.

    OS Version               Patch ID
   __________               _________
   SunOS 5.8                109320-04
   SunOS 5.8_x86            109321-04
   SunOS 5.7                107115-09
   SunOS 5.7_x86            107116-09
   SunOS 5.6                106235-09
   SunOS 5.6_x86            106236-09
_______________________________________________________________________________

APPENDICES

A.  Patches listed in this bulletin are available to all Sun customers at:

    http://sunsolve.sun.com/securitypatch

B.  Checksums for the patches listed in this bulletin are available at:

    ftp://sunsolve.sun.com/pub/patches/CHECKSUMS

C.  Sun security bulletins are available at:

    http://sunsolve.sun.com/security

D.  Sun Security Coordination Team's PGP key is available at:

    http://sunsolve.sun.com/pgpkey.txt

E.  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

F.  To receive information or subscribe to our CWS (Customer Warning System)
   mailing list, send email to:

        security-alert@sun.com

    with a subject line (not body) containing one of the following commands:

        Command         Information Returned/Action Taken
       _______         _________________________________

        help            An explanation of how to get information

        key             Sun Security Coordination Team's PGP key

        list            A list of current security topics

        query [topic]   The email is treated as an inquiry and is forwarded to
                       the Security Coordination Team

        report [topic]  The email is treated as a security report and is
                       forwarded to the Security Coordination Team. Please
                       encrypt sensitive mail using Sun Security Coordination
                       Team's PGP key

        send topic      A short status summary or bulletin. For example, to
                       retrieve a Security Bulletin #00138, supply the
                       following in the subject line (not body):

                                send #138

        subscribe       Sender is added to our mailing list.  To subscribe,
                       supply the following in the subject line (not body):

                                subscribe cws your-email-address

                        Note that your-email-address should be substituted
                       by your email address.

        unsubscribe     Sender is removed from the CWS mailing list.
________________________________________________________________________________

Copyright 2000 Sun Microsystems, Inc. All rights reserved. Sun,
Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries. This
Security Bulletin may be reproduced and distributed, provided that this
Security Bulletin is not modified in any way and is attributed to
Sun Microsystems, Inc. and provided that such reproduction and distribution
is performed for non-commercial purposes.

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Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References

None

Addendum

Sun has confirmed the existence of this vulnerability andnow has patches included in a jumbo set provided for all lp services. Until these patches can be applied, the following workarounds may be used to mitigate against the risk of being attacked via exploitation of this vulnerability:

  • Disable the print service in /etc/inetd.conf
  • Enable the noexec_user_stack tunable
  • Block access to 515/tcp (printer) at all appropriate network perimeters

    If you have feedback, comments, or additional information about this vulnerability, please send us email.