Articles / SuSE: various bugs in OpenS…

SuSE: various bugs in OpenSSH

The OpenSSH daemon shipped with SuSE distributions contains various minor bugs which allows bypassing of IP-access control in some circumstances or the deletion of files named "cookies" if X11 forwarding is enabled. It has also been verified that the recent remotely exploitable crc32 bug as well as the logging-bug has been fixed in SuSE's latest ssh packages. Packages fixing the latest bugs can be obtained from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                openssh
        Announcement-ID:        SuSE-SA:2001:044
        Date:                   Mon Dec  3 14:01:19 CET 2001
        Affected SuSE versions: 6.4, 7.0, 7.1, 7.2, 7.3
        Vulnerability Type:     various bugs
        Severity (1-10):        4
        SuSE default package:   yes
        Other affected systems: All systems shipping OpenSSH <= 2.9.9

    Content of this advisory:
        1) security vulnerability resolved: Various problems in OpenSSH.
           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 OpenSSH daemon shipped with SuSE distributions contains various minor
    bugs which allows bypassing of IP-access control in some circumstances or
    the deletion of files named "cookies" if X11 forwarding is enabled.
    It has also been verified that the recent remotely exploitable crc32 bug as
    well as the logging-bug has been fixed in our latest ssh packages.
    We strongly recommend to update to OpenSSH version 2.9.9p2. Please download
    and update the packages as described in section 3. Then invoke

        /etc/rc.d/sshd restart

    to restart the OpenSSH daemon.
    If you are logged on via sshd, then it is adviseable to perform the update
    in an atjob to make sure that it can be completed if your secure shell
    daemon gets killed:

        rpm -Uhv openssh-*.rpm
        echo "rcsshd restart" | at now

    Please note that OpenSSH 2.9.9p2 is *not*
    vulnerable to the crc32/deattack exploit. Some people made wrong statements
    about that recently and claimed they have found exploits for this version
    "in the wild" which exploits the crc32 hole against this version.
    This is wrong and you can safely ignore these discussions.

    If you installed the ssh-1.2.27 package instead of the openssh package no
    updates should be necessary as long as you recognized the SuSE Security
    Announcement SuSE-SA:2001:04 which recommends to update to the latest
    ssh-1.2.27 packages.

    Due to legal constraints, the packages for the 7.0 and older
    distributions containing cryptographic code can be found on ftp.suse.de,
    not ftp.suse.com. The distribution 7.1 and newer have all of their
    update packages on ftp.suse.com.


    i386 Intel Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/openssh-2.9.9p2-38.i386.rpm
      6ba603f1115b0125abf0b62f28ba6666
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/openssh-2.9.9p2-38.src.rpm
      644d74829ecaa12c6a28cc9564bb0a1c

    SuSE-7.2
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/openssh-2.9.9p2-25.i386.rpm
      0b0406a63181bf23c683add3f6f9abc3
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/openssh-2.9.9p2-25.src.rpm
      5914018a06e77f7477058afa8617ab10

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/sec1/openssh-2.9.9p2-26.i386.rpm
      0d69dce8f61317c84efde55f6cc95f10
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/openssh-2.9.9p2-26.src.rpm
      3aeba61d45d243773db8d1b7eedf6924

    SuSE-7.0
    ftp://ftp.suse.de/pub/suse/i386/update/7.0/sec1/openssh-2.9.9p2-27.i386.rpm
      2defc4cf8182b1e5eb4b204224007dd6
    source rpm:
    ftp://ftp.suse.de/pub/suse/i386/update/7.0/zq1/openssh-2.9.9p2-27.src.rpm
      1999c7c42507c1c4d831daf170e88c6e

    SuSE-6.4
    ftp://ftp.suse.de/pub/suse/i386/update/6.4/sec1/openssh-2.9.9p2-27.i386.rpm
      5fe6fdee55502e81b383b5b11047cee9
    source rpm:
    ftp://ftp.suse.de/pub/suse/i386/update/6.4/zq1/openssh-2.9.9p2-27.src.rpm
      cfee6bebb8086dc2d861aeb5fff6dc17


    Sparc Platform:

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/sec1/openssh-2.9.9p2-8.sparc.rpm
      8dcf46c82f11c35e8812d477caacd3b2
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/openssh-2.9.9p2-8.src.rpm
      27ed16f77bcabd34919681fa07fcbd1c

    SuSE-7.0
    ftp://ftp.suse.de/pub/suse/sparc/update/7.0/sec1/openssh-2.9.9p2-8.sparc.rpm
      a23db0e0516a935cfce8a199a48ce036
    source rpm:
    ftp://ftp.suse.de/pub/suse/sparc/update/7.0/zq1/openssh-2.9.9p2-8.src.rpm
      e4c6c636fe7dd5e234d89dd28564611b


    AXP Alpha Platform:

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/sec1/openssh-2.9.9p2-5.alpha.rpm
      b0e29b53f247c7a8ba6d17297867730e
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/openssh-2.9.9p2-5.src.rpm
      73a832a3b10876d751203aca7fd37607

    SuSE-7.0
    ftp://ftp.suse.de/pub/suse/axp/update/7.0/sec1/openssh-2.9.9p2-6.alpha.rpm
      5e07df7ce670e3918f0948495d74e23c
    source rpm:
    ftp://ftp.suse.de/pub/suse/axp/update/7.0/zq1/openssh-2.9.9p2-6.src.rpm
      3a26418017f5af49ba707e51fa28d954

    SuSE-6.4
    ftp://ftp.suse.de/pub/suse/axp/update/6.4/sec1/openssh-2.9.9p2-6.alpha.rpm
      c2e7364a00aef31a9d121302d316ce4f
    source rpm:
    ftp://ftp.suse.de/pub/suse/axp/update/6.4/zq1/openssh-2.9.9p2-6.src.rpm
      d3a9299f748395912644c375e24302f7


    Power PC Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec1/openssh-2.9.9p2-23.ppc.rpm
      bdab314f57128accaa4855a8aedf23df
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/openssh-2.9.9p2-23.src.rpm
      840bde44f9b372e637a7bdcf3b11a87e

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/sec1/openssh-2.9.9p2-25.ppc.rpm
      d3b5f2b85ce6cf9e30a0826127f5b6e4
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/openssh-2.9.9p2-25.src.rpm
      888e553f06f96ddd7395ad4c241e0b69

    SuSE-7.0
    ftp://ftp.suse.de/pub/suse/ppc/update/7.0/sec1/openssh-2.9.9p2-18.ppc.rpm
      34eee0c543d2cf266d084d7262475573
    source rpm:
    ftp://ftp.suse.de/pub/suse/ppc/update/7.0/zq1/openssh-2.9.9p2-18.src.rpm
      c33d2e38303853e9363ee0beb9889b43

    SuSE-6.4
    ftp://ftp.suse.de/pub/suse/ppc/update/6.4/sec1/openssh-2.9.9p2-17.ppc.rpm
      4d00f9e0a85631c3e2dd721ca0784f27
    source rpm:
    ftp://ftp.suse.de/pub/suse/ppc/update/6.4/zq1/openssh-2.9.9p2-17.src.rpm
      685e7c8f85117384ea1205b683593b47



______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    No additional information in this announcement.

______________________________________________________________________________

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 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 "build@suse.de" 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:

    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-announce@suse.com
        -   SuSE's announce-only mailing list.
            Only SuSE's security annoucements are sent to this list.
            To subscribe, send an email to
                .

    For general information or the frequently asked questions (faq)
    send mail to:
         or
         respectively.

    ===================================================
    SuSE's security contact is .
    The  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 
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key 

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-- 
~
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
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