SuSE: 'heartbeat' Remote format string overflow vulnerability

    Date14 Oct 2002
    CategorySuSE
    3000
    Posted ByLinuxSecurity Advisories
    A remote attacker could send a speciallycrafted TCP packet that overflows a buffer, leaving heartbeat to execute arbitrary code as root.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                heartbeat
            Announcement-ID:        SuSE-SA:2002:037
            Date:                   Monday, Oct 14, 12:00 UTC
            Affected products:      8.0, 8.1
            Vulnerability Type:     remote root
            Severity (1-10):        7
            SuSE default package:   yes
            Cross References:        http://linux-ha.org/security/sec01.txt
    
        Content of this advisory:
            1) security vulnerability resolved: format string bug in heartbeat
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds:
                - util-linux
                - dhcpcd
    	    - heimdal
    	    - logsurfer
    	    - ghostscript
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        Heartbeat is a monitoring service that is used to implement
        failover in high-availablity environments. It can be configured to
        monitor other systems via serial connections, or via UDP/IP.
    
        Several format string bugs have been discovered in the heartbeat
        package.  One of these format string bugs is in the normal path
        of execution, all the remaining ones can only be triggered if
        heartbeat is running in debug mode. Since heartbeat is running with
        root privilege, this problem can possibly be exploited by remote
        attackers, provided they are able to send packets to the UDP port
        heartbeat is listening on (port 694 by default).
    
        Vulnerable versions of heartbeat are included in SuSE Linux 8.0 and
        SuSE Linux 8.1.
    
        As a workaround, make sure that your firewall blocks all traffic
        to the heartbeat UDP port.
    
        The proper fix is to upgrade to the packages provided by SuSE.
        In addition to fixing the format string bug, this update also
        changes heartbeat to perform processing of network packets as
        user "nobody" instead of root. The update package for SuSE Linux
        8.1 also fixes a boot time problem with heartbeat.
    
        SuSE wishes to thank Nathan Wallwork for reporting the bug, and Alan
        Robertson for his assistance in dealing with this problem. For more
        information on this vulnerability, please refer to
         http://linux-ha.org/security/sec01.txt
    
        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.
    
        i386 Intel Platform:
    
        SuSE-8.1
        	- being rebuilt
    
        SuSE-8.0
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap5/heartbeat-0.4.9.1-159.i386.rpm
          510f5a4c4c094ef0a98d46c53deae660
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap5/heartbeat-ldirectd-0.4.9.1-159.i386.rpm
          86e1d5ae00efedfeb7e29e47cec973f6
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap5/heartbeat-stonith-0.4.9.1-159.i386.rpm
          3067c26bd4a861e255b8e9dc74aad050
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/heartbeat-0.4.9.1-159.src.rpm
          e1df88a1af12d5e13cabc2662248f2c2
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - util/util-linux
        The mount and umount program did not set their umask properly before
        creating the mtab file. Local attackers could abuse the mount program
        to put arbitrary content into the /etc/mtab file. New packages are
        available on our ftp servers which fix this problem. An update is
        recommended.
    
        - dhcpcd
        The dhcpcd DHCP client daemon has the ability to execute an
        external script named /sbin/dhcpcd-.exe when assigning
        a new IP address.  It is not installed by default, however.
    
        The script obtains the DHCP information by sourcing a file named
        /var/lib/dhcpcd/dhcpcd-.info, containing a list
        of shell variable assignments. Insufficient quoting of these
        assignments allowed malicious DHCP servers (or attackers able
        to spoof DHCP responses) to execute arbitrary shell commands on
        the DHCP client if the user had installed the script.
    
        - heimdal
        Within the SuSE Advisory SuSE-SA:2002:034 regarding the Heimdal packages,
        the following rpm was missing in the list:
    
        SuSE-7.3
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/heimdal-lib-0.4d-132.i386.rpm
          7356a6c07dfe91d968939f6f52a5879d
    
        If you updated the Heimdal packgages for SuSE 7.3-i386, make sure you also
        update this package.
    
        - logsurfer
        New logsurfer (logsurf in SuSE-7.0) packages are available for
        download. These packages fix two errors (off-by-one overflow,
        uninitialized memory) in the logsurfer package that can lead to
        a crash of the program, resulting in a denial of service.  It is
        unknown if the two bugs can be used to execute arbitrary code in
        the context of the logsurfer program.
    
        - ghostscript (CVE CAN-2002-0363)
        In ghostscript 6.50, setting the interpreter to SAFE mode was
        reversible. This could be exploited to subvert the accounts of
        users viewing malicious PostScript[tm], as well as the lp acount
        if the print system was enabled.
        SuSE has released updated RPMs for SuSE Linux 7.3 and SuSE Linux
        Enterprise Server 7 for PowerPC. No other SuSE platform is affected.
    
        - gv/ggv/kghostview (CVE CAN-2002-0832)
        The ghostview (gv) code had several buffer overflows when handling
        PostScript[tm] structural comments. These were also present in the
        GNOME and KDE PostScript viewers derived from it. SuSE has released
        fixed packages for these vulnerabilities.
    
    ______________________________________________________________________________
    
    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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