SuSE Security Announcement: Multiple vulnerabilities in BIND8 (SuSE-SA:2002:044)

From: Olaf Kirch (okirat_private)
Date: Thu Nov 14 2002 - 02:19:30 PST

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    -----BEGIN PGP SIGNED MESSAGE-----
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                bind8
            Announcement-ID:        SuSE-SA:2002:044
            Date:                   Wed Nov 13 17:00:00 CET 2002
            Affected products:      (7.0), 7.1, 7.2, 7.3, 8.0, 8.1,
    				SuSE Linux Database Server
    				SuSE eMail Server III, 3.1
    				SuSE Firewall
    				SuSE Linux Enterprise Server for S/390
    				SuSE Linux Connectivity Server
    				SuSE Linux Enterprise Server 7
    				SuSE Linux Office Server
            Vulnerability Type:     remote command execution
            Severity (1-10):        8
            SuSE default package:   yes
            Cross References:       CVE CAN-2002-1219,
    				CAN-2002-1220, CAN-2002-1221,
    				http://www.isc.org/products/BIND/bind-security.html
    				http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21469
    
        Content of this advisory:
            1) security vulnerability resolved: Remote command execution
    	   in bind8 name server.
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds: BIND4, reports
    	   of trojanized tcpdump/libpcap
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        The security research company ISS (Internet Security Services)
        has discovered several vulnerabilities in the BIND8 name server,
        including a remotely exploitable buffer overflow.
    
        Circumstancial evidence suggests that the Internet Software
        Consortium (maintainer of BIND) has been made aware of these issues
        in mid-October. Distributors of Open Source operating systems,
        including SuSE, were notified of these vulnerabilities via CERT
        approximately 12 hours before the release of the advisories by ISS
        and ISC on Tue, Nov 12. This notification did not include any details
        that allowed us to identify the vulnerable code, much less prepare
        a fix. Mails to ISC went unanswered for 36 hours.
    
        The SuSE security team regrets that the Internet Software Consortium
        has withheld vital information from the Internet community for so long,
        putting the majority of BIND users at risk. We would like to express
        our concern that the approach chosen by ISC and ISS is likely to
        erode trust in the security community if it becomes a model for dealing
        with security issues.
    
        We apologize to SuSE customers for not being able to provide timely
        fixes for this problem.
    
        The advisories by ISS and ISC mention the following problems
        in detail:
    
         1.	There is a buffer overflow in the way named handles
            SIG records. This buffer overflow can be exploited to
            obtain access to the victim host under the account
            the named process is running with.
    
    	In order to exploit this problem, the attacker must
    	control an existing DNS domain, and must be allowed
    	to perform a recursive query.
    
    	The impact of this vulnerability is serious.
    
    	In all SuSE products, named is configured to run as user "named"
    	by default, so a potential attacker or virus/worm does not get
    	immediate root access. However, this is merely an additional
    	obstacle the attacker faces. It may be possible for the attacker
    	to exploit other, unpatched local vulnerabilities such as the
    	recently announced traceroute hole to obtain root privilege. It
    	may also be possible for an attacker to obtain increased privilege
    	by manipulating the DNS zones served by the victim BIND server.
    
    	We recommend to upgrade to the provided packages. If this is
    	not possible, we recommend to restrict recursive requests as a
    	workaround. This can be done by adding a statement such as the
    	following to /etc/named.conf:
    
    	options {
    		... existing options ...
    
    		# Restrict recursive queries to 192.168.1.*,
    		# except 192.168.1.254.
    		# Order does matter.
    		allow-recursion {
    			!192.168.1.254;
    			192.168.1/24;
    		};
    	};
    
    	Alternatively, you can add "recursion no;" to the options
    	section to turn off recursion completely.
    
         2.	There are several Denial Of Service problems in BIND8
            that allow remote attackers to terminate the name server
            process.
    
    	At least one of these vulnerabilities seems to be exploitable
    	even when the attacker is not allowed to perform recursive
    	queries, so that the workaround suggested above is not
    	effective against this bug.
    
        Both vulnerabilities are addressed by this update, using patches
        originating from ISC.
    
        Due to the severity of this issue, we will provide update packages
        for SuSE Linux 7.0, even though support for this product has officially
        been discontinued.
    
        Please download the update package for your distribution and verify its
        integrity by the methods listed in section 3) of this announcement.
        Then, install the packages using the command "rpm -Fhv file.rpm" to apply
        the update. After updating, make sure to restart the name server
        process by issuing the following command as root:
    
        	rcnamed restart
    
        Our maintenance customers are being notified individually. The packages
        are being offered to install from the maintenance web.
    
    
    
    
        Intel i386 Platform:
    
        SuSE-8.1:
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/bind8-8.2.4-260.i586.rpm
          e1c07d8c1dd74374cc37e7fa692c9de1
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/bindutil-8.2.4-260.i586.rpm
          b41734970bf88aa7b5d3debbf834b78d
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/bind8-devel-8.2.4-260.i586.rpm
          f7236e5e621725e100dbd204e2692a66
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/bind8-8.2.4-260.src.rpm
          02154fbdc935a2900d70ce6a16e96543
    
        SuSE-8.0:
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/bind8-8.2.4-260.i386.rpm
          07bc10c5c348c560084edb3c289459c9
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/bindutil-8.2.4-260.i386.rpm
          4db27e9ad4ae038d81422a0c5b9a34d0
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/bind8-devel-8.2.4-260.i386.rpm
          a1b3958e0fbaed30ddecbf7753007dbf
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/bind8-8.2.4-260.src.rpm
          0b66ae2b5c462f041625919fed7ab089
    
        SuSE-7.3:
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/bind8-8.2.4-261.i386.rpm
          fe0654b3de751533874b08a860afea5e
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/bindutil-8.2.4-261.i386.rpm
          043a8c1c0bb2cc23308a614dc7bdc0fe
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/bind8-devel-8.2.4-261.i386.rpm
          59aca78f5aacb3ff7ecbc252eb760956
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/bind8-8.2.4-261.src.rpm
          355add6397435262c597ad662e3df119
    
        SuSE-7.2:
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/bind8-8.2.3-200.i386.rpm
          1072a9fe708150bc14c70a72ca42dfd3
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/bindutil-8.2.3-200.i386.rpm
          0713d9b200db862110493233bc1d8321
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/bind8-devel-8.2.3-200.i386.rpm
          c681a91b38104cf47de4f4d454136a8a
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/bind8-8.2.3-200.src.rpm
          8f51737bc0c84b7be08fe3bb1d4012b4
    
        SuSE-7.1:
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/bind8-8.2.3-200.i386.rpm
          f2c14f81038d7ba952def27981b4599c
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/bindutil-8.2.3-200.i386.rpm
          961a5403a41e8031c054a081ebf92ba5
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/bind8-8.2.3-200.src.rpm
          7f3c9b95591fb22f00dc0b22cdd5fcf1
    
        SuSE-7.0:
        ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/bind8-8.2.3-200.i386.rpm
          0a6b9e23cefa5cd9f06660571ebf85ff
        ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/bindutil-8.2.3-200.i386.rpm
          3a6e0e81c2d8b05ee01a2a0b9c26e9a4
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/bind8-8.2.3-200.src.rpm
          1c2cb2e531fe2834de84b22ad714de68
    
    
    
        Sparc Platform:
    
        SuSE-7.3:
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/bind8-8.2.4-128.sparc.rpm
          c08454b933ed2365d9d2ab1322803af6
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/bindutil-8.2.4-128.sparc.rpm
          47e063be85fadfa2e5d0fce1746a34b5
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/bind8-devel-8.2.4-128.sparc.rpm
          46a97b033cca0a01dcb39ef90275ce46
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/bind8-8.2.4-128.src.rpm
          827a7f56273c7a25ac40ffba728e9150
    
    
    
    
        AXP Alpha Platform:
    
        SuSE-7.1:
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/bind8-8.2.3-139.alpha.rpm
          77f39990fabacb545657236a60fecbe0
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/bindutil-8.2.3-139.alpha.rpm
          33bf9f28a7c9105c84216906694c7b7c
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/bind8-8.2.3-139.src.rpm
          df347649fc98de695837a88452814ee6
    
        SuSE-7.0:
        ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/bind8-8.2.3-139.alpha.rpm
          23f307cda6a0eefb3d9f1a0439950bdd
        ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/bindutil-8.2.3-139.alpha.rpm
          0789b49749d93ddd79192506cda00f7a
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/bind8-8.2.3-139.src.rpm
          356306a7f2c079e2726b3aa8da496e9b
    
    
    
        PPC Power PC Platform:
    
        SuSE-7.3:
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/bind8-8.2.4-200.ppc.rpm
          4cbeb4719625f8735ec03c27e1b27b85
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/bindutil-8.2.4-200.ppc.rpm
          37fca302d72c819e713f8038d730a527
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/bind8-devel-8.2.4-200.ppc.rpm
          f0f5cb7b808789606448a4d472c71400
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/bind8-8.2.4-200.src.rpm
          5c810e6f144d0f2875bb06d2331f50d8
    
        SuSE-7.1:
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/bind8-8.2.3-121.ppc.rpm
          47fcc451954f03a915b57b500bd56c57
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/bindutil-8.2.3-121.ppc.rpm
          2c0de3b64d5c3d62cb840a534911ef31
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/bind8-8.2.3-121.src.rpm
          235e142413ec35bcbdb86168b04b7a78
    
        SuSE-7.0:
        ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/bind8-8.2.3-121.ppc.rpm
          44dc01f6b4fae1dfd87874db6d42e8d9
        ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/bindutil-8.2.3-121.ppc.rpm
          d46f45bef0f12c3c5b071443ac9e7f13
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/bind8-8.2.3-121.src.rpm
          1bac32496ae66d4b0e35bc34d4e500ff
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        BIND4
    	In addition to the vulnerabilities in BIND8 discussed above, ISS
    	report several vulnerabilities in BIND4. As stated previously,
    	SuSE has discontinued support for BIND4 and recommends that
    	users upgrade to BIND8 as soon as possible.
    
        Trojaned libpcap/tcpdump
        	There have been reports that the source packages of tcpdump and
    	libpcap available from several FTP servers have been modified to
    	include a trojan. We have checked our source packages for this
    	and found them to be clean.
    
    ______________________________________________________________________________
    
    3)  standard appendix: authenticity verification, additional information
    
      - Package authenticity verification:
    
        SuSE update packages are available on many mirror ftp servers all over 
        the world. While this service is being considered valuable and important
        to the free and open source software community, many users wish to be 
        sure about the origin of the package and its content before installing
        the package. There are two verification methods that can be used 
        independently from each other to prove the authenticity of a downloaded
        file or rpm package:
        1) md5sums as provided in the (cryptographically signed) announcement.
        2) using the internal gpg signatures of the rpm package.
    
        1) execute the command 
            md5sum <name-of-the-file.rpm>
           after you downloaded the file from a SuSE ftp server or its mirrors.
           Then, compare the resulting md5sum with the one that is listed in the
           announcement. Since the announcement containing the checksums is 
           cryptographically signed (usually using the key securityat_private), 
           the checksums show proof of the authenticity of the package.
           We disrecommend to subscribe to security lists which cause the 
           email message containing the announcement to be modified so that
           the signature does not match after transport through the mailing 
           list software.
           Downsides: You must be able to verify the authenticity of the
           announcement in the first place. If RPM packages are being rebuilt
           and a new version of a package is published on the ftp server, all 
           md5 sums for the files are useless.
    
        2) rpm package signatures provide an easy way to verify the authenticity
           of an rpm package. Use the command
            rpm -v --checksig <file.rpm>
           to verify the signature of the package, where <file.rpm> is the
           filename of the rpm package that you have downloaded. Of course, 
           package authenticity verification can only target an un-installed rpm
           package file.
           Prerequisites:
            a) gpg is installed
            b) The package is signed using a certain key. The public part of this
               key must be installed by the gpg program in the directory 
               ~/.gnupg/ under the user's home directory who performs the
               signature verification (usually root). You can import the key
               that is used by SuSE in rpm packages for SuSE Linux by saving
               this announcement to a file ("announcement.txt") and
               running the command (do "su -" to be root):
                gpg --batch; gpg < announcement.txt | gpg --import
               SuSE Linux distributions version 7.1 and thereafter install the
               key "buildat_private" upon installation or upgrade, provided that
               the package gpg is installed. The file containing the public key
               is placed at the top-level directory of the first CD (pubring.gpg)
               and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .
    
    
      - SuSE runs two security mailing lists to which any interested party may
        subscribe:
    
        suse-securityat_private
            -   general/linux/SuSE security discussion. 
                All SuSE security announcements are sent to this list.
                To subscribe, send an email to 
                    <suse-security-subscribeat_private>.
    
        suse-security-announceat_private
            -   SuSE's announce-only mailing list.
                Only SuSE's security announcements are sent to this list.
                To subscribe, send an email to
                    <suse-security-announce-subscribeat_private>.
    
        For general information or the frequently asked questions (faq) 
        send mail to:
            <suse-security-infoat_private> or
            <suse-security-faqat_private> respectively.
    
        =====================================================================
        SuSE's security contact is <securityat_private> or <securityat_private>.
        The <securityat_private> public key is listed below.
        =====================================================================
    ______________________________________________________________________________
    
        The information in this advisory may be distributed or reproduced,
        provided that the advisory is not modified in any way. In particular,
        it is desired that the clear-text signature shows proof of the
        authenticity of the text.
        SuSE Linux AG makes no warranties of any kind whatsoever with respect
        to the information contained in this security advisory.
    
    Type Bits/KeyID    Date       User ID
    pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team <securityat_private>
    pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <buildat_private>
    
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    This archive was generated by hypermail 2b30 : Sat Nov 16 2002 - 14:12:34 PST