NetBSD Security Advisory 2002-028: Buffer overrun in getnetbyname/getnetbyaddr

From: NetBSD Security Officer (security-officer@netbsd.org)
Date: 11/19/02

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    To: bugtraq@securityfocus.com
    From: NetBSD Security Officer <security-officer@netbsd.org>
    Date: Wed, 20 Nov 2002 02:22:12 +0900
    
    

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                     NetBSD Security Advisory 2002-028
                     =================================

    Topic: Buffer overrun in getnetbyname/getnetbyaddr

    Version: NetBSD-current: source prior to November 15, 2002
                    NetBSD 1.6: affected
                    NetBSD-1.5.3: affected
                    NetBSD-1.5.2: affected
                    NetBSD-1.5.1: affected
                    NetBSD-1.5: affected

    everity: Possible remote root compromise

    Fixed: NetBSD-current: November 15, 2002
                    NetBSD-1.6 branch: November 16, 2002
                    NetBSD-1.5 branch: November 16, 2002

    Abstract
    ========

    getnetbyname(3) and getnetbyaddr(3) lacked important boundary checks,
    and are vulnerable to malicious DNS responses, which could cause a
    buffer overrun on the stack. The vulnerability could cause a remote
    root compromise, if a privileged process uses these library functions.

    Technical Details
    =================

    http://www.isc.org/products/BIND/bind-security.html
    See the section named: "LIBRESOLV: buffer overrun"

    Solutions and Workarounds
    =========================

    Since the issue is in libc, all statically-linked binaries have to be rebuilt.

    Any binary that is statically linked against a vulnerable version of libc
    must be rebuilt. This includes binaries built by the pkgsrc system.

    Any binary that depends on libc with an older major number (compiled
    before 1997) should be removed.

    The following instructions describe how to upgrade your libc
    binaries by updating your source tree and rebuilding and
    installing a new version of libc.

    * NetBSD-current:

            Systems running NetBSD-current dated from before 2002-11-15
            should be upgraded to NetBSD-current dated 2002-11-15 or later.

            The following directories need to be updated from the
            netbsd-current CVS branch (aka HEAD):
                    lib/libc/net/getnetnamadr.c

            To update from CVS, re-build, and re-install libc and statically-linked
            binaries:
                    # cd src
                    # cvs update -d -P lib/libc/net/getnetnamadr.c

                    # cd lib/libc
                    # make obj dependall
                    # make install

                    # cd ../../rescue
                    # make obj dependall
                    # make install

                    # cd ../sbin/verifiedexec_load
                    # make obj dependall
                    # make install

    * NetBSD 1.6:

            Systems running NetBSD 1.6 dated from before 2002-11-16 should
            be upgraded to NetBSD 1.6 dated 2002-11-16 or later.

            The following directories need to be updated from the
            netbsd-1-6 CVS branch:
                    lib/libc/net/getnetnamadr.c

            To update from CVS, re-build, and re-install libc and statically-linked
            binaries:
                    # cd src
                    # cvs update -d -P -r netbsd-1-6 lib/libc/net/getnetnamadr.c

                    # cd lib/libc
                    # make obj dependall
                    # make install

                    # cd ../../bin
                    # make obj dependall
                    # make install
                    # cd ../sbin
                    # make obj dependall
                    # make install

    * NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3:

            Systems running NetBSD 1.5, 1.5.1, 1.5.2 or 1.5.3 dated from before
            2002-11-16 should be upgraded to NetBSD 1.6 dated 2002-11-16 or
            later.

            The following directories need to be updated from the
            netbsd-1-5 CVS branch:
                    lib/libc/net/getnetnamadr.c

            To update from CVS, re-build, and re-install libc and statically-linked
            binaries:
                    # cd src
                    # cvs update -d -P -r netbsd-1-5 lib/libc/net/getnetnamadr.c

                    # cd lib/libc
                    # make obj dependall
                    # make install

                    # cd ../../bin
                    # make obj dependall
                    # make install
                    # cd ../sbin
                    # make obj dependall
                    # make install

    Revision History
    ================

            2002-11-20 Initial release

    More Information
    ================

    Advisories may be updated as new information becomes available.
    The most recent version of this advisory (PGP signed) can be found at
      ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2002-028.txt.asc

    Information about NetBSD and NetBSD security can be found at
    http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/.

    Copyright 2002, The NetBSD Foundation, Inc. All Rights Reserved.

    $NetBSD: NetBSD-SA2002-028.txt,v 1.8 2002/11/19 16:50:45 david Exp $

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