SuSE: 2003:040 Critical: Sendmail Buffer Overflow Remote Access Risk

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                sendmail, sendmail-tls
        Announcement-ID:        SuSE-SA:2003:040
        Date:                   Saturday, Sep 20th 2003 18:00 MEST
        Affected products:      7.2, 7.3, 8.0, 8.1, 8.2
                                SuSE Linux Database Server,
                                SuSE Linux Enterprise Server 7, 8
                                SuSE Linux Firewall on CD/Admin host
                                SuSE Linux Connectivity Server
                                SuSE Linux Office Server
        Vulnerability Type:     local/remote privilege escalation
        Severity (1-10):        7
        SuSE default package:   yes (until SuSE Linux 8.0 and SLES7)
        Cross References:       CAN-2003-0694
                                CERT  cert
                                 
                                 Sendmail Open Source - Open Source Email Server | Proofpoint US

    Content of this advisory:
        1) security vulnerability resolved: sendmail, sendmail-tls
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - mysql
        3) standard appendix (further information)

______________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    sendmail is the most widely used mail transport agent (MTA) in the
    internet. A remotely exploitable buffer overflow has been found in all
    versions of sendmail that come with SuSE products. These versions include
    sendmail-8.11 and sendmail-8.12 releases. sendmail is the MTA subsystem
    that is installed by default on all SuSE products up to and including
    SuSE Linux 8.0 and the SuSE Linux Enterprise Server 7.

    The vulnerability discovered is known as the prescan()-bug and is not
    related to the vulnerability found and fixed in April 2003. The error
    in the code can cause heap or stack memory to be overwritten, triggered
    by (but not limited to) functions that parse header addresses. 

    There is no known workaround for this vulnerability other than using a
    different MTA. The vulnerability is triggered by an email message sent
    through the sendmail MTA subsystem. In that respect, it is different
    from commonly known bugs that occur in the context of an open TCP
    connection. By consequence, the vulnerability also exists if email
    messages get forwarded over a relay that itself does not run a vulnerable
    MTA. This specific detail and the wide distribution of sendmail in the
    internet causes this vulnerability to be considered a flaw of major
    severity. We recommend to install the update packages that are provided
    for download at the locations listed below.

    We thank Michal Zalewski who discovered this vulnerability and the 
    friendly people from Sendmail Inc (Claus Assmann) who have communicated
    problem to SuSE Security.

    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.

    SPECIAL INSTALL INSTRUCTIONS:
    =============================    After performing the update, it is necessary to restart all running
    instances of sendmail using the command "rcsendmail restart" as root.





    Intel i386 Platform:

    SuSE-8.2:
      
      98b411a03df3a657dcef79be8f5d1ab2
      
      59c84f025e29401fb798d3253a67bd70
    patch rpm(s):
      
      99c717aee89be0a9d791a48cec41a57d
      
      9feac7f2b475531d07279a3606dd3b37
    source rpm(s):
      
      ffb2d8b0fd28a9a5244f2696879f3762

    SuSE-8.1:
      
      3b96f198fa7e9726e4e575444baa10d6
      
      0b56d4ac6453c5962bf9e9d363b83849
    patch rpm(s):
      
      92f7e4376ea2ed5f4f7652e3e47a7638
      
      843a111a942d24a6380f91f7f21e9316
    source rpm(s):
      
      d4a2d5463ef5bfcc5c36bd3b9da36271

    SuSE-8.0:
      
      85d6d62eb31223c8bc607b65551ea024
      
      24d814266bf8c305dbd275009655f7e4
    patch rpm(s):
      
      7f384fedbc35b23d92da843e2fc38046
      
      95de8a86f1dad5f1b3e28bb9cb40c02c
    source rpm(s):
      
      92c4a75367211fb0b23b1706a2b893f1

    SuSE-7.3:
      
      51d281703157e04e39e48f5b21cb1469
      
      1131ad179e17de3c7d0a8d0a7a7e5348
    source rpm(s):
      
      5c547ec8f50f6fa756e160063076365c
      
      eb0a06b8a387297463cbccb639e5fb6f

    SuSE-7.2:
      
      3bed3854baec797e2ff6d14f9582fcda
      
      2713adc9c6feecc146a796034b3f7b98
    source rpm(s):
      
      1b28f2aca4bb0b9231869267cbd4a06d
      
      352f504b486334537d952aa90b82ac08



    Sparc Platform:

    SuSE-7.3:
      
      24c874c51666ca5b9f5ce2a7431af63e
      
      5d41fe793f6744e70f6bde005363884c
    source rpm(s):
      
      7f27980cf2fb11453a80964355aaddbc
      
      dda3511ac3f95af3623837e19b6a80f6



    PPC Power PC Platform:

    SuSE-7.3:
      
      0442e3a7504bb4bb57e896fcd83e80b9
      
      cbf8c7e5e9f61c3017ad5d80b7c4c76b
    source rpm(s):
      
      47031fa3484a66081f623760fcf53dc1
      
      9ce8128f4847f6fb0d8b0662f3145388
______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

  - As already announced in SuSE-SA:2003:038 and SuSE-SA:2003:039, we are
    working on update packages for the mysql buffer overflow vulnerability.
    The packages will be made available as soon as possible.
______________________________________________________________________________

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 security@suse.de),
       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 "build@suse.de" 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   .


  - SuSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   general/linux/SuSE security discussion.
            All SuSE security announcements are sent to this list.
            To subscribe, send an email to
                <suse-security-subscribe@suse.com>.

    suse-security-announce@suse.com
        -   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-subscribe@suse.com>.

    For general information or the frequently asked questions (faq)
    send mail to:
        <suse-security-info@suse.com> or
        <suse-security-faq@suse.com> respectively.

    ====================================================================    SuSE's security contact is <security@suse.com> or <security@suse.de>.
    The <security@suse.de> 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 <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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Roman Drahtmüller,
SuSE Security.
- - --
 -                                                                      -
| Roman Drahtmüller      <draht@suse.de> // "You don't need eyes to see, |
  SuSE Linux AG - Security       Phone: //             you need vision!"
| Nürnberg, Germany     +49-911-740530 //           Maxi Jazz, Faithless |
 -                                                                      -
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