SuSE: tcpdump Denial of service vulnerability

    Date13 Mar 2003
    CategorySuSE
    2173
    Posted ByLinuxSecurity Advisories
    This bug can be exploited remotely by an attacker to stop the use of tcpdump for analyzing network traffic for signs of security breaches or alike. Another bug may lead to system compromise due to the handling of malformed NFS packets send by an attacker.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                tcpdump
            Announcement-ID:        SuSE-SA:2003:0015
            Date:                   Thursday, Mar 13th 2003 16:10 MET
            Affected products:      7.3, 8.0, 8.1
                                    SuSE Linux Database Server
                                    SuSE eMail Server 3.1
                                    SuSE eMail Server III
                                    SuSE Firewall Adminhost VPN
                                    SuSE Linux Admin-CD for Firewall
                                    SuSE Firewall on CD 2 - VPN
                                    SuSE Firewall on CD 2
                                    SuSE Linux Live-CD for Firewall
                                    SuSE Linux Connectivity Server
                                    SuSE Linux Enterprise Server 7 for S/390 and zSeries
                                    SuSE Linux Enterprise Server 8
                                    SuSE Linux Office Server
            Vulnerability Type:     remote system compromise
            Severity (1-10):        4
            SuSE default package:   yes
            Cross References:       CAN-2003-0108
    
        Content of this advisory:
            1) security vulnerability resolved:
                - denial-of-service condition while parsing ISAKMP or BGP packets
                - possible remote code execution while handling NFS packets
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds:
                - ethereal
                - qpopper
                - XFree4
                - sendmail
                - apcupsd
                - snort
                - file
                - zlib
                - vnc
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        The network traffic analyzer tool tcpdump is vulnerable to a denial-of-
        service condition while parsing ISAKMP or BGP packets. This bug can
        be exploited remotely by an attacker to stop the use of tcpdump for
        analyzing network traffic for signs of security breaches or alike.
        Another bug may lead to system compromise due to the handling of
        malformed NFS packets send by an attacker.
        Please note, that tcpdump drops root privileges right after allocating
        the needed raw sockets.
    
        There is no temporary fix known.
    
        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 package using the command "rpm -Fhv file.rpm" to apply
        the update.
        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/tcpdump-3.7.1-198.i586.rpm
          524015d3f9517311ee46eb63bc3ed42f
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/tcpdump-3.7.1-198.i586.patch.rpm
          2e1d2db971cf2693e5acca0da7e3bb39
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/tcpdump-3.7.1-198.src.rpm
          12da6755830e7614e8f81a204c546cbf
    
        SuSE-8.0:
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-322.i386.rpm
          069db7de9a137b050f38c6f6a3398266
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-322.i386.patch.rpm
          3dcb00b25d35d275e2e70eba2c96fa26
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/tcpdump-3.6.2-322.src.rpm
          0ed4e0db7d71f5a518173193f8a9b057
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/tcpdump-3.6.2-321.i386.rpm
          22b2a243e3a2fbbb0288d76da5a2bccc
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/tcpdump-3.6.2-321.src.rpm
          d50729c39c29566371c7d708be782d43
    
        SuSE-7.2:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/tcpdump-3.4a6-376.i386.rpm
          601bc08d351e8100767bbfd502efd44b
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/tcpdump-3.4a6-376.src.rpm
          af87a4ad56fc853800c6af5982899f18
    
        SuSE-7.1:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/tcpdump-3.4a6-375.i386.rpm
          a3251d65bfa05948ce3796ac9e5fdf5b
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/tcpdump-3.4a6-375.src.rpm
          84ba69db15e1ff569cf674f7d61428f1
    
    
    
        Sparc Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/tcpdump-3.6.2-65.sparc.rpm
          7f75bdd0c9456fe437647030bb52d92d
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/tcpdump-3.6.2-65.src.rpm
          4b3049a5048e5904a69d16b028220f42
    
    
    
    
        AXP Alpha Platform:
    
        SuSE-7.1:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/tcpdump-3.4a6-329.alpha.rpm
          614dfa16b71456692bc1d92b9db0998b
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/tcpdump-3.4a6-329.src.rpm
          e5a05bdbe3d5a29f0840c488e703268b
    
    
    
        PPC Power PC Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/tcpdump-3.6.2-207.ppc.rpm
          fef9a77ba86c06d661c34646a8101b8a
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/tcpdump-3.6.2-207.src.rpm
          9c800d4fc891a30a4a880b55979ffe3a
    
        SuSE-7.1:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/tcpdump-3.4a6-317.ppc.rpm
          4dd468ba517be7c7f52a8b2ac7c2beb0
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/tcpdump-3.4a6-317.src.rpm
          69be109e360246794c66ed55e199ee95
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - ethereal
          A format string bug in ethereal's SOCKS handling code and a buffer
          overflow in the NTLMSSP was found in ethereal. Both bugs may lead
          to remote system compromise.
          New packages are currently being build and will be available soon.
    
        - qpopper
          In version 4.0.x of qpopper a buffer overflow *after* user authen-
          tication can be exploited to gain a shell on a POP-server machine.
          New packages are currently being build and will be available soon.
    
        - XFree4
          A buffer overflow in the Xlib code can be triggered while handling
          the environment variable XLOCALEDIR. The X version affected is 4.2.0
          (SuSE Linux 8.0 and 8.1).
          We still investigate this issue.
    
        - sendmail
          A correction is necessary to the last SuSE Security Announcement
          (SuSE-SA:2003:013) about sendmail: The Vulnerability Type must read
          remote buffer overflow.
    
        - apcupsd
          The control and management daemon for APC UPS systems is vulnerable
          to remote code execution due to buffer overflow and format string bugs.
          A dedicated advisory for this issue will be released as soon as all
          packages are build.
    
        - snort
          snort, a sensor-based Network Intrusion Detection System, was
          vulnerable to a buffer overflow in it's RPC preprocessor.
          As a workaround the following line in snort.conf should be commented
          out and snort should be restarted to disable the RPC-preprocessor:
            preprocessor rpc_decode: 111 32771
          Future version of SuSE Linux will be shipped with a fixed snort
          package.
    
        - file
          A locally exploitable buffer overflow was found in the file command.
          New packages are currently being build and will be available soon.
    
        - zlib
          zlib's function gzprintf() is prone to a buffer overflow if its
          arguments expand to more then Z_PRINTF_BUFSIZE bytes.
          A fixed version of zlib will be shipped with future SuSE Linux
          versions.
    
        - vnc
          VNC (Virtual Network Computing) uses a weak cookie generation process
          which can be exploited by an attacker to bypass authentication.
          New packages are currently being tested and will be available on our
          FTP servers soon.
    
    ______________________________________________________________________________
    
    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 
           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 This email address is being protected from spambots. You need JavaScript enabled to view it.),
           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 
           to verify the signature of the package, where  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 "This email address is being protected from spambots. You need JavaScript enabled to view it." 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:
    
        This email address is being protected from spambots. You need JavaScript enabled to view it.
            -   general/linux/SuSE security discussion.
                All SuSE security announcements are sent to this list.
                To subscribe, send an email to
                    <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
    
        This email address is being protected from spambots. You need JavaScript enabled to view it.
            -   SuSE's announce-only mailing list.
                Only SuSE's security announcements are sent to this list.
                To subscribe, send an email to
                    <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
    
        For general information or the frequently asked questions (faq)
        send mail to:
            <This email address is being protected from spambots. You need JavaScript enabled to view it.> or
            <This email address is being protected from spambots. You need JavaScript enabled to view it.> respectively.
    
        =====================================================================
        SuSE's security contact is <This email address is being protected from spambots. You need JavaScript enabled to view it.> or <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
        The <This email address is being protected from spambots. You need JavaScript enabled to view it.> 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 <This email address is being protected from spambots. You need JavaScript enabled to view it.>
    pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <This email address is being protected from spambots. You need JavaScript enabled to view it.>
    
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