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SuSE Security Announcement: OpenSSH

Dec 03, 2001, 20:21 (0 Talkback[s])
Subject: [suse-security-announce] SuSE Security Announcement: OpenSSH
Date: Mon, 3 Dec 2001 15:22:31 +0100 (CET)
From: Sebastian Krahmer 
To: suse-security-announce@suse.com



                        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 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.s
rc.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.s
rc.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.s
rc.rpm 3aeba61d45d243773db8d1b7eedf6924

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

    SuSE-6.4
   
 ftp://ftp.suse.de/pub/suse/i386/update/6.4/sec1/openssh-2.9.9p2-27.i
386.rpm 5fe6fdee55502e81b383b5b11047cee9
    source rpm:
   
 ftp://ftp.suse.de/pub/suse/i386/update/6.4/zq1/openssh-2.9.9p2-27.sr
c.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.s
rc.rpm 27ed16f77bcabd34919681fa07fcbd1c

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


    AXP Alpha Platform:

    SuSE-7.1
   
 ftp://ftp.suse.com/pub/suse/axp/update/7.1/sec1/openssh-2.9.9p2-5.al
pha.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.alp
ha.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.alp
ha.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.p
pc.rpm bdab314f57128accaa4855a8aedf23df
    source rpm:
   
 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/openssh-2.9.9p2-23.sr
c.rpm 840bde44f9b372e637a7bdcf3b11a87e

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

    SuSE-7.0
   
 ftp://ftp.suse.de/pub/suse/ppc/update/7.0/sec1/openssh-2.9.9p2-18.pp
c.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.pp
c.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 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
 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 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 "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-subscribe@suse.com.

    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
                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
    The security@suse.com 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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