SuSE: 'squid' remote denial of service vulnerability

    Date30 Oct 2001
    CategorySuSE
    2789
    Posted ByLinuxSecurity Advisories
    The squid proxy server can be crashed with a malformed request, resulting    in a denial of service attack. After the crash, the squid proxy must be    restarted.
    
    
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                squid
            Announcement-ID:        SuSE-SA:2001:037
            Date:                   Tuesday, Oct 30th 2001 12:30 MEST
            Affected SuSE versions: 6.3, 6.4, 7.0, 7.1, 7.2, 7.3
            Vulnerability Type:     remote denial of service
            Severity (1-10):        4
            SuSE default package:   no
            Other affected systems: Systems running the squid proxy server
    
        Content of this advisory:
            1) security vulnerability resolved: squid
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        The squid proxy server can be crashed with a malformed request, resulting
        in a denial of service attack. After the crash, the squid proxy must be
        restarted. The weakness can only be triggered from an address that
        is allowed to send requests, as configured in the squid configuration
        file.
    
        An upgrade to a fixed version of the squid package is the only reasonable
        countermeasure against the bug. Please download the package for your
        distribution, verify its integrity according to section 3) of this
        SuSE Security announcement, then apply the update using the command
            rpm -Uhv 
        where  is the filename of the package that you downloaded.
    
    
        NOTE:
        SuSE Linux distributions come with two different squid packages: One
        development package and one stable package. The respective package
        for your installation can be found using the command
            rpm -qa|grep squid
        Please download and update only the package that is installed on your
        system as determined by the version of the package installed.
        Both packages for your distribution are listed below.
    
        SPECIAL INSTALL INSTRUCTIONS:
        The squid proxy has to be restarted in order for the fix to become
        effective. Use the command
            rcsquid restart
        after successful installation of the upgrade to do this. Please note
        that the start of the squid daemon can use several seconds so that
        the daemon refuses to accept connections during that time.
    
    
    
        i386 Intel Platform:
    
        SuSE-7.3
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/squid-2.3.STABLE4-132.i386.rpm
          f36c9784ca566b2cf54f75396e512ff6
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/squid-beta-2.4.STABLE2-33.i386.rpm
          3f49f2edbda920c97c0833752f82a451
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/squid-2.3.STABLE4-132.src.rpm
          5f6432889116c0adba9a3d485690477b
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/squid-beta-2.4.STABLE2-33.src.rpm
          0d13b2e11000515d48b9813d7e015a11
    
        SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/squid-2.3.STABLE4-131.i386.rpm
          8f73f7b4ae29cd57ad476845737cca76
        SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/squid-beta-2.4.STABLE1-85.i386.rpm
          408c3d5b79ff05078e0ed1ca2a7c7835
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/squid-2.3.STABLE4-131.src.rpm
          87200955fd04b95b53121c91daf08508
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/squid-beta-2.4.STABLE1-85.src.rpm
          ac991ef42ffd20242b62a79b4f9a8298
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/squid2-2.2.STABLE5-203.i386.rpm
          d88eb53e568e282e399e63247dd21f17
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/squid23-2.3.STABLE4-57.i386.rpm
          ed15547d3d898de69705206865bc5e3d
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/squid2-2.2.STABLE5-203.src.rpm
          6e96b682734434243216955801ca3966
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/squid23-2.3.STABLE4-57.src.rpm
          286132a8a084117c13ecd20963e4e026
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/squid2-2.2.STABLE5-203.i386.rpm
          cc05027b083f96f5ecb8d74ee5af48c3
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/squid23-2.3.STABLE4-57.i386.rpm
          27812ca7b960ca891d14056f8e50d93d
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/squid2-2.2.STABLE5-203.src.rpm
          3821655bdf3a93b1b3607c786e31e4b5
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/squid23-2.3.STABLE4-57.src.rpm
          20a5cd54b491baa98ef062e59222043a
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/squid2-2.2.STABLE5-203.i386.rpm
          6241edb66ce49d7c0c99e4d4eee5f62d
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/squid23-2.3.STABLE4-57.i386.rpm
          73e2338db1a51b0f2c3fd06c692b9433
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/squid2-2.2.STABLE5-203.src.rpm
          cca2eac81e9da884b68547a10753e3aa
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/squid23-2.3.STABLE4-57.src.rpm
          41b0f0f3d3ba588a69d4d3bdbbaa67f0
    
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/squid-1.NOVM.22-0.i386.rpm
          287c56b9f60ebc6f0592ebd82aaafdbd
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/squid2-2.2.STABLE5-25.i386.rpm
          7ebcf1942316bc7dd9ccc81aa02d22a6
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/squid-1.NOVM.22-0.src.rpm
          96b7d50fa8548c4a62602d9a6c30ee15
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/squid2-2.2.STABLE5-25.src.rpm
          ec16fdc160c4bab2447903843de38e96
    
    
    
        Sparc Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/squid2-2.2.STABLE5-199.sparc.rpm
          32c7b23fae7195f85bc641076020f525
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/squid23-2.3.STABLE4-52.sparc.rpm
          58ef46972e17b4c18934705ad1e119fc
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/squid2-2.2.STABLE5-199.src.rpm
          fdd0149a27a9ce2dc62b6cd3d36bf5d9
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/squid23-2.3.STABLE4-52.src.rpm
          ae95420b0cabfcec6ea8e45cafbec98a
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/squid2-2.2.STABLE5-200.sparc.rpm
          7ea9ebf4033748dc2926681f91b757a2
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/squid23-2.3.STABLE4-53.sparc.rpm
          f5182a0ee681e1038ce9a27a5669dc78
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/squid2-2.2.STABLE5-200.src.rpm
          2df8efacd6309d282ddf1a9fd85f5b0d
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/squid23-2.3.STABLE4-53.src.rpm
          7283004306500f6af0945a127eb7cb10
    
    
    
        AXP Alpha Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/squid2-2.2.STABLE5-211.alpha.rpm
          5731678da53fefafd8b598b4bdd0b1c5
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/squid23-2.3.STABLE4-59.alpha.rpm
          131ddb39a0642abd01ac7758b1ee1659
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/squid2-2.2.STABLE5-211.src.rpm
          2a455ab029dfa08d93b8f0882d27f3c0
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/squid23-2.3.STABLE4-59.src.rpm
          af85f07cc967e2c0afd58c15757901b9
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/squid2-2.2.STABLE5-211.alpha.rpm
          6c8717d3ecc33f36fda8b9126f5aa9c4
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/squid23-2.3.STABLE4-59.alpha.rpm
          f601abe230336f0aff1e2dd794905746
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/squid2-2.2.STABLE5-211.src.rpm
          0c286031c7261283c51ecc7b181f5c5a
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/squid23-2.3.STABLE4-59.src.rpm
          c13de698610cfbe85c9db43c0b46c33a
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/squid2-2.2.STABLE5-211.alpha.rpm
          72ed52eb121cf09af0085eade83c31e9
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/squid23-2.3.STABLE4-59.alpha.rpm
          d00639d8014cadfaaf0f877600fc265b
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/squid2-2.2.STABLE5-211.src.rpm
          9654093482932c0c5b6e19641c12e515
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/squid23-2.3.STABLE4-59.src.rpm
          93956c1d356b14d1c0ce4f6176b6bc82
    
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/squid-1.NOVM.22-0.alpha.rpm
          963dab91fe801b0db5b8bc1290c510ac
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/squid2-2.2.STABLE5-24.alpha.rpm
          0a2cc791d49c12e43318166b18fbf4c9
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/squid-1.NOVM.22-0.src.rpm
          d4bed546b971e980e013a19524dfe0a6
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/squid2-2.2.STABLE5-24.src.rpm
          1911f50775e228ba85801afe14b4127c
    
    
    
        PPC Power PC Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/squid2-2.2.STABLE5-191.ppc.rpm
          8570b7b727184e65e06bbc94952dd1c1
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/squid23-2.3.STABLE4-59.ppc.rpm
          06b6a7d709dd647f877cd2c49c8a25b0
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/squid2-2.2.STABLE5-191.src.rpm
          01f3d3f73ff7f707aaa5915904f04816
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/squid23-2.3.STABLE4-59.src.rpm
          e3d908e3f6f4d29e5fe6b47ee63efe71
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/squid2-2.2.STABLE5-191.ppc.rpm
          080ede69d095009d348d66575d737ded
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/squid23-2.3.STABLE4-59.ppc.rpm
          815f6081346eea1883e269c5349687b9
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/squid2-2.2.STABLE5-191.src.rpm
          67036c2982d2e353a5063b4f173bd994
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/squid23-2.3.STABLE4-59.src.rpm
          d69897df473cf8added443549fe90614
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/squid2-2.2.STABLE5-191.ppc.rpm
          059e627ca63f48176d310321bd1d6715
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/squid23-2.3.STABLE4-59.ppc.rpm
          f90c456e8d7ba561f585f388ead58f3e
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/squid2-2.2.STABLE5-191.src.rpm
          31db9a010dcbcfe98e966042cd3aac0f
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/squid23-2.3.STABLE4-59.src.rpm
          80b5f2f0325aaeeeee413f9fedc9eacb
    
    
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
      - openssh
        After stabilizing the openssh package, updates for the distributions
        6.4-7.2 are currently being prepared. The update packages fix a security
        problem related to the recently discovered problems with source ip
        based access restrictions in a user's ~/.ssh/authorized_keys2 file.
        The packages will appear shortly on our ftp servers. Please note that
        packages for the distributions 6.3 and up including 7.0 containing
        cryptographic software are located on the German ftp server ftp.suse.de,
        all other packages can be found on ftp.suse.com at the usual location.
        We will issue a dedicated Security announcement for the openssh package.
    
    ______________________________________________________________________________
    
    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 uninstalled 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 toplevel 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 annoucements 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.>.
        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 cleartext signature shows proof of the
        authenticity of the text.
        SuSE GmbH makes no warranties of any kind whatsoever with respect
        to the information contained in this security advisory.
    
    
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