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SuSE Security Announcement: fetchmail (SuSE-SA:2001:026)


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Date: Fri, 17 Aug 2001 10:25:43 +0200 (CEST)
From: Thomas Biege <[email protected]>
To: [email protected]
Subject: SuSE Security Announcement: fetchmail (SuSE-SA:2001:026)

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                fetchmail
        Announcement-ID:        SuSE-SA:2001:026
        Date:                   Thursday, August 16th 2001 11:30 MEST
        Affected SuSE versions: [6.0, 6.1, 6.2,] 6.3, 6.4, 7.0, 7.1, 7.2
        Vulnerability Type:     remote privilege escalation
        Severity (1-10):        6
        SuSE default package:   yes
        Other affected systems: yes

        Content of this advisory:
        1) security vulnerability resolved: fetchmail
           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

  Fetchmail is a tool for retrieving and forwarding mail. Two vulnerabilities
  in the code of fetchmail were found in the last weeks.
    1.) By sending a header with a large "To:" line a buffer overflow will
        be triggered in the header parsing code.
    2.) By impersonating a pop3 or imap server by using DNS spoofing
        or getting control over the pop3/imap server an attacker could
        trigger a buffer overflow in the pop3 and imap code of fetchmail.
        All the attacker has to do is to fake a LIST response message and
        providing two integers. One will used as index for a stack array
        and the other one is the value written to this index.
  Both vulnerabilities could be used to get remote access to the system with
  the privilege of the user running fetchmail.

  A temporary fix is not possible, so we suggest to install the new RPM
  on your system.



  i386 Intel Platform:

  SuSE-7.2
  ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/fetchmail-5.8.0-48.i386.rpm
      995660f54f997eb33120c6dcdab5ca73
  source rpm:
  ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/fetchmail-5.8.0-48.src.rpm
      6466071439f694d89d011c35265de909

  SuSE-7.1
  ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/fetchmail-5.6.5-27.i386.rpm
      a6185bbbd1cdeb6f4b5a7afbe8efcd31
  SuSE-7.1
  ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/fetchmailconf-5.6.5-0.i386.rpm
      4ed63ae1652db9037c56e8a6bbf95da2
  source rpm:
  ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/fetchmail-5.6.5-27.src.rpm
      27aed0c7fbfb882dce9451a1c673908d

  SuSE-7.0
  ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/fetchml-5.4.0-3.i386.rpm
      b2aec10ba865e37bef95a32f8adfa8d2
  source rpm:
  ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/fetchml-5.4.0-3.src.rpm
      8a133db913032e2ea04517e0d86dde5c

  SuSE-6.4
  ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/fetchml-5.3.0-3.i386.rpm
      d8c0aed277da334a5be9d7241f2d3fc3
  source rpm:
  ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/fetchml-5.3.0-3.src.rpm
      732deaa4ba6e181d15c8dbabff5e309f

  SuSE-6.3
  ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/fetchml-5.1.2-7.i386.rpm
      d0e91680594f84f161f8dfee95125e0a
  source rpm:
  ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/fetchml-5.1.2-7.src.rpm
      cac94bd2373d75dad6c91d66583eadfb



  Sparc Platform:

  SuSE-7.1
  ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/fetchmail-5.6.5-12.sparc.rpm
      4d7dcbf03a030ece4dd50acd3b330ad3
  source rpm:
  ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/fetchmail-5.6.5-12.src.rpm
      9d245f4358da492133e5a735497dbf2b

  SuSE-7.0
  ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/fetchml-5.4.0-3.sparc.rpm
      07462524836665fb3ad8da365b948f5f
  source rpm:
  ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/fetchml-5.4.0-3.src.rpm
      bb2438d4e03b01415d675c2d05e3c847



  AXP Alpha Platform:

  SuSE-7.1
  ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/fetchmail-5.6.5-16.alpha.rpm
      0a4503aadd5981e9a4c2bc57a46eb9b9
  source rpm:
  ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/fetchmail-5.6.5-16.src.rpm
      a8c6425a9f15b04ff27a4f0636e65f93

  SuSE-7.0
  ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/fetchml-5.4.0-3.alpha.rpm
      851a72a94dc9aa152fff3f9dfd30aeb5
  source rpm:
  ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/fetchml-5.4.0-3.src.rpm
      e876b48882702c6c45e01326f85a610a

  SuSE-6.4
  ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/fetchml-5.3.0-3.alpha.rpm
      e44e632813710d4eb3b778414733631e
  source rpm:
  ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/fetchml-5.3.0-3.src.rpm
      27908e4fe9995dd86054533d17e85f5b

  SuSE-6.3
  ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/fetchml-5.1.2-4.alpha.rpm
      0751d23ccdfd860409cb592b84c203e4
  source rpm:
  ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/fetchml-5.1.2-4.src.rpm
      ac0a757562c01bf84780fd81e04a7784



  PPC PowerPC Platform:

  SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/fetchmail-5.6.5-16.ppc.rpm
      f84f2b9f669e3ba65d42ddac78b9f49c
  source rpm:
  ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/fetchmail-5.6.5-16.src.rpm
      999b7fcfb1799ae98d5a2ffaf103f9a7

  SuSE-7.0
  ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/fetchml-5.4.0-3.ppc.rpm
      55a46529b8f9cae39cd3a3d06728e300
  source rpm:
  ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/fetchml-5.4.0-3.src.rpm
      b3ecbc340fb46e5c6501f34184fa69fd

  SuSE-6.4
  ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/fetchml-5.3.0-3.ppc.rpm
      d3bf46ca935d696b1a45ff1b3c820840
  source rpm:
  ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/fetchml-5.3.0-3.src.rpm
      6dbd73a017fd2915c9197860f47a6d28


______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

  Please watch out for upcomming announcements.


______________________________________________________________________________

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 [email protected]),
       the checksums show proof of the authenticity of the package.
       We advise against subscribing 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 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 "[email protected]" 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:

    [email protected]
        -   general/linux/SuSE security discussion.
            All SuSE security announcements are sent to this list.
            To subscribe, send an email to
                <[email protected]>.

    [email protected]
        -   SuSE's announce-only mailing list.
            Only SuSE's security annoucements are sent to this list.
            To subscribe, send an email to
                <[email protected]>.

    For general information or the frequently asked questions (faq)
    send mail to:
        <[email protected]> or
        <[email protected]> respectively.


SuSE's security contact is <[email protected]>. The <[email protected]> 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. Type Bits/KeyID Date User ID pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <[email protected]> pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <[email protected]> - -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org mQENAzbhLQQAAAEIAKAkXHe0lWRBXLpn38hMHy03F0I4Sszmoc8aaKJrhfhyMlOA BqvklPLE2f9UrI4Xc860gH79ZREwAgPt0pi6+SleNFLNcNFAuuHMLQOOsaMFatbz JR9i4m/lf6q929YROu5zB48rBAlcfTm+IBbijaEdnqpwGib45wE/Cfy6FAttBHQh 1Kp+r/jPbf1mYAvljUfHKuvbg8t2EIQz/5yGp+n5trn9pElfQO2cRBq8LFpf1l+U P7EKjFmlOq+Gs/fF98/dP3DfniSd78LQPq5vp8RL8nr/o2i7jkAQ33m4f1wOBWd+ cZovrKXYlXiR+Bf7m2hpZo+/sAzhd7LmAD0l09kABRG0JVN1U0UgU2VjdXJpdHkg VGVhbSA8c2VjdXJpdHlAc3VzZS5kZT6JARUDBRA24S1H5Fiyh7HKPEUBAVcOB/9b yHYji1/+4Xc2GhvXK0FSJN0MGgeXgW47yxDL7gmR4mNgjlIOUHZj0PEpVjWepOJ7 tQS3L9oP6cpj1Fj/XxuLbkp5VCQ61hpt54coQAvYrnT9rtWEGN+xmwejT1WmYmDJ xG+EGBXKr+XP69oIUl1E2JO3rXeklulgjqRKos4cdXKgyjWZ7CP9V9daRXDtje63 Om8gwSdU/nCvhdRIWp/Vwbf7Ia8iZr9OJ5YuQl0DBG4qmGDDrvImgPAFkYFzwlqo choXFQ9y0YVCV41DnR+GYhwl2qBd81T8aXhihEGPIgaw3g8gd8B5o6mPVgl+nJqI BkEYGBusiag2pS6qwznZiQEVAwUQNuEtBHey5gA9JdPZAQFtOAf+KVh939b0J94u v/kpg4xs1LthlhquhbHcKNoVTNspugiC3qMPyvSX4XcBr2PC0cVkS4Z9PY9iCfT+ x9WM96g39dAF+le2CCx7XISk9XXJ4ApEy5g4AuK7NYgAJd39PPbERgWnxjxir9g0 Ix30dS30bW39D+3NPU5Ho9TD/B7UDFvYT5AWHl3MGwo3a1RhTs6sfgL7yQ3U+mvq MkTExZb5mfN1FeaYKMopoI4VpzNVeGxQWIz67VjJHVyUlF20ekOz4kWVgsxkc8G2 saqZd6yv2EwqYTi8BDAduweP33KrQc4KDDommQNDOXxaKOeCoESIdM4p7Esdjq1o L0oixF12CohGBBARAgAGBQI7HmHDAAoJEJ5A4xAACqukTlQAoI4QzP9yjPohY7OU F7J3eKBTzp25AJ42BmtSd3pvm5ldmognWF3Trhp+GZkBogQ57vSBEQQAk/GN+ftr 7+DBlSoixDDpfRnUk+jApGEt8hCnrnjVnPs/9Cr33+CXLQbILOO7Y5oiPbJdHh45 t4E0fKyLVzDerCRFB1swz/mNDxT26DLysdBV5fwNHTPhxa67goAZVrehQPqJEckk IpYriOaYcKpF3n5fQIZMEfMaHEElQhcXML8AoJVXDkJYh7vI8EUB8ZURNLZMEECN A/sH0MCnb4Q6ZcRyeZ3+1PHP8hP73b6TepRdLZhaylwVF/iu7uIn62ZUL4//NTOC DY7V63qg4iba/fUbOsWtEnGaiE7mQuAlsSWvRspwRA9/g9rdVf3/JdLJrLmKBThe yG+PSJE3W7cAE4ZWafGxIRCwXhmj3TQnJn2euqylHRubEQP/aL53NZK0kBdvrKgf f6O8Of6tqoss8Dkk55I7QVFSp+My1Dn+mngQKFejTAgtyo/WmR3wPjQ9HoT2lRiY I2lTRYT4uMdHuwVC3b4DqAKmoy375FERwHkrMVyKBJslv8QtbAWw5A1CAUseaHo+ 91wmYJ4/4p6YUahqbG/tZyhbxfq0KFN1U0UgUGFja2FnZSBTaWduaW5nIEtleSA8 YnVpbGRAc3VzZS5kZT6IXAQTEQIAHAUCOe70gQUJA8JnAAQLCgMEAxUDAgMWAgEC F4AACgkQqE7a6JyACspfLACffAYA+NM8NBhyRyH+nTX58CNjwLIAoIx9fj52BJe0 xY7WbKoXs1+72b2AiEYEEBECAAYFAjpwXlIACgkQnkDjEAAKq6TczgCgi+ddhWb7 +FWcfeE6WwPZccqAHowAnjjtRyGwHLQHr5OTFAYTXi2Wv6jNiQEVAwUQOnBgb3ey 5gA9JdPZAQE1pwf/QJ+b34lFBNVUJ7fk/xGJJREt7V12iSafaRzGuH8xWvIz1bb+ VARxnnt16FDQ1cDNjoEhCEmcW83Vxp6iJXE9PE8wVA/Yue/bon5JS7J69+UiQ2eq 2pudfwljp52lYVM53jgPYEz0q/v3091nlZ8CYkAkN9JDS1lV1gEzJ7J0+POngDpU +lDQT2EC6VKaxeWK8pNt6UFDwICRDQxKnlOoiDvTrdWT7QdJZ4sPv8Qotdw9+tKN bWQ2DqdIRxyTdw9xDfAtcj6mXeQr7852Lwem1gSKVnEYHZ9g1FTJqVOutY8KhpUc 9RfOCRv8XuIxrs4KSbfSF0s8qIRCQelxufg9AbkCDQQ57vSSEAgAhJHQTejMX+Vr 6g1pHDEcusJ63fQ2CfFFE5iE9okH9O7UVCiSfb9CV38dmeHdPCEEjDUWquFYEnvj 3WICMtH249t1Ymuf4Du3yRKQ9oXdn/qTJzlrx9qzjiG3mH7ocwHOgUIwCrZoEdBE VE2n0zPVm+hddwjWWTWXw6pxQz+i9dsN89xexRV5M9O0bNwCLaNWX2GXeLAkqTK/ 9EuZy6x2yLxi6du9YYUAXkZpqBhCjtiUXpRoFCdglMznbcAyCk9C2wqb2j/D1Z2B eSBaGCSFkR6pRLebnE17LWcu72Iy+r0z+JecbPiyDpDZj4apn7IC81aNFGi7fNIT sHODbwwjiwADBgf/YPvVdzkc8OC7ztacEWCanwylKvxCdKzTDA+DfES6WUYShyiV JvZzRy25LJ5WcK20kzOS6Qv1OrIXiz/pdGy1aKtJZrAnFEsofpmOj8VoqyyFgp/y AGQBp12+mXek7SCZRhuqalDfEMRiWEJ6J5dLkyShyRDWyPbFh0HXE7QTHN+IKKxx QqNQXL6Z3NSxS61p+5n6BseiDUI39xxkKTFwFrkgUIc5Gs2Or2lhaWvGwSfoCmwb sklszZt6xbU+R0SjFqTvjPWx6eHfqbmNC9WMDdTjGrXDDKXFp2aYlokfN6It9vsb VlGNlOwHt/JjGoPMxW6Xqj0FLA7/VewgCdXW64hMBBgRAgAMBQI57vSSBQkDwmcA AAoJEKhO2uicgArKSyIAmwUHf/vtKQfcmVg4asR7U6XQl0bAAJ4pO22B5U8UH6IY l2LBCXFqw5+5fA== =Jnnf - -----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv iQEVAwUBO3zSP3ey5gA9JdPZAQEuGQf/cnbAlt/DJ+cd5JFiNZIXheBGVZUUIG/U vYeZasD8RSEhTDU11qWxn8Ypdh3sK2yPcP+LXLhIotHGsZ4xvmMDft1YXvsE6Fxj zITSkBGuOvcCW+LhRLMHuhuaTYfZWrQty1bjmt+KgALkWodrnbsayZ9Q4X0vpPmm /iH7PitiOZ4DA2CRIkaFlSlBQnHm4P1twLUZxvHbspb5B8aUtgM+49+QGQHiAYhL uWS+dgxmlAhzA5D/qtQnVdkaoegIS+41rxINnKQvuZRmIPyYno4/Z2o5XqWBOdYU +vjJ050RnfKPIrajNtmIaM/ENPk67hzpHGP6n71hqwD27ybCow9BkQ== =efR3 -----END PGP SIGNATURE----- Bye, Thomas -- Thomas Biege, SuSE GmbH, Schanzaeckerstr. 10, 90443 Nuernberg E@mail: [email protected] Function: Security Support & Auditing "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka" Key fingerprint = 51 AD B9 C7 34 FC F2 54 01 4A 1C D4 66 64 09 84

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