-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: ssh Announcement-ID: SuSE-SA:2001:04 Date: Friday, February 16th, 2000 18:00 MET Affected SuSE versions: 6.0, 6.1, 6.2, 6.3, 6.4, 7.0 Vulnerability Type: possible remote root compromise Severity (1-10): 9 SuSE default package: yes, no (openssh is default after SuSE-6.3) Other affected systems: Unix systems with sshd running Content of this advisory: 1) security vulnerability resolved: ssh 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 SuSE distributions contain the ssh package in the version 1.2.27. No later version is provided because of licensing issues. SuSE maintains the 1.2.27 version in a patched package. Three new patches have been added that workaround three independent security problems in the ssh package: a) SSHD-1 Logging Vulnerability (discovered and published by Jose Nazario, Crimelabs). Attackers can remotely brute-force passwords without getting noticed or logged. In the ssh package from the SuSE distribution, root login is allowed, as well as password authentication. Even though brute-forcing a password may take an enormous amount of time and resources, the issue is to be taken seriously. b) SSH1 session key recovery vulnerability (by (Ariel Waissbein, Agustin Azubel) - CORE SDI, Argentina, and David Bleichenbacher). Captured encrypted ssh traffic can be decrypted with some effort by obtaining the session key for the ssh session. The added patch in our package causes the ssh daemon to generate a new server key pair upon failure of an RSA operation (please note that the patch supplied with Iván Arce on bugtraq on Wed, 7 Feb 2001 has been corrected later on!). c) In 1998, the ssh-1 protocol was found to be vulnerable to an attack where arbitrary sequences could be inserted into the ssh-1 protocol layer. The attack was called "crc32 compensation attack", and a fix was introduced (crc compensation attack detector in the ssh -v output) into the later versions of ssh. Michal Zalewski discovered that the fix in its most widely used implementation is defective. An integer overflow allows an attacker to overwrite arbitrary memory in the sshd process' address space, which potentionally results in a remote root compromise. There are easy resorts that can be offered: a) switch to openssh (please use the openssh packages on ftp.suse.com from the same update directories as the ssh package update URLs below indicate). openssh is a different implementation of the ssh protocol that is compatible to the protocol versions 1 and 2. Openssh Version 2.3.0 does not suffer from the problems listed above. Versions before 2.3.0 are vulnerable to other problems, so please use the updates from the update directory on the ftp.suse.de ftp server. See section 2) of this announcement for the md5sums of the packages. b) upgrade your ssh package from the locations described below. <p> Download the update package from locations desribed below and install the package with the command `rpm -Uhv file.rpm'. The md5sum for each file is in the line below. You can verify the integrity of the rpm files using the command `rpm --checksig --nogpg file.rpm', independently from the md5 signatures below. <p> SPECIAL INSTALL INSTRUCTIONS: ============================== If you run a sshd (secure shell daemon) server on your system, then the daemon process must be restarted for the update package to become active after installation of the update rpm. You can do this easily with the command (ran as root): kill -15 `cat /var/run/sshd.pid` After this, you can start the daemon using the command rcsshd start It should be possible now to log on again to your server as usual. Please consult the syslogs in /var/log if this is not the case. Warning: killing all instances of sshd on a system might render the system inaccessible from remote, especially if secure shell is your only method to access the system. Be careful to not lock yourself out. <p> Note: The packages on our German ftp server have been built again to correct one of the patches. The package for the 6.1-i386 distribution has finished building a few minutes ago and uses the same name as the build from Wednesday. Use the --force commandline option for the rpm command if you have used the package that was published before the release date of this announcement. <p> i386 Intel Platform: SuSE-7.1 ftp://ftp.suse.de/pub/suse/i386/update/7.1/sec2/ssh-1.2.27-226.i386.rpm ae68bf3ac28b5e81f9c5f2a1d1d8980e source rpm: ftp://ftp.suse.de/pub/suse/i386/update/7.1/zq1/ssh-1.2.27-226.src.rpm d332e662daff71ff7d10cf4d962b6933 SuSE-7.0 ftp://ftp.suse.de/pub/suse/i386/update/7.0/sec1/ssh-1.2.27-220.i386.rpm f88b339dea96ef186e70872ce9444c24 source rpm: ftp://ftp.suse.de/pub/suse/i386/update/7.0/zq1/ssh-1.2.27-220.src.rpm 93ca5fc96c103a5f9adee16cb319195c SuSE-6.4 ftp://ftp.suse.de/pub/suse/i386/update/6.4/sec1/ssh-1.2.27-86.i386.rpm 3f1b41116b7c7d63c791de4fdca9d1ee source rpm: ftp://ftp.suse.de/pub/suse/i386/update/6.4/zq1/ssh-1.2.27-86.src.rpm 3a8d859f2ae9751852339c642b07b4cf SuSE-6.3 ftp://ftp.suse.de/pub/suse/i386/update/6.3/sec1/ssh-1.2.27-86.i386.rpm 3f1b41116b7c7d63c791de4fdca9d1ee source rpm: ftp://ftp.suse.de/pub/suse/i386/update/6.3/zq1/ssh-1.2.27-86.src.rpm 3a8d859f2ae9751852339c642b07b4cf SuSE-6.2 ftp://ftp.suse.de/pub/suse/i386/update/6.2/sec1/ssh-1.2.27-210.i386.rpm b29822198dc6430167465706965e3499 source rpm: ftp://ftp.suse.de/pub/suse/i386/update/6.2/zq1/ssh-1.2.27-210.src.rpm 4a2130635f702bb266748b9e4838877a SuSE-6.1 ftp://ftp.suse.de/pub/suse/i386/update/6.1/sec1/ssh-1.2.27-210.i386.rpm 17f281262edd689d9861c099489cbcc6 source rpm: ftp://ftp.suse.de/pub/suse/i386/update/6.1/zq1/ssh-1.2.27-210.src.rpm 5e12e0086f61bba2f37c4ccbc4282a92 <p><p> Sparc Platform: SuSE-7.0 ftp://ftp.suse.de/pub/suse/sparc/update/7.0/sec1/ssh-1.2.27-221.sparc.rpm e1545287f954d089707c55a66598c318 source rpm: ftp://ftp.suse.de/pub/suse/sparc/update/7.0/zq1/ssh-1.2.27-221.src.rpm f37a8b3addaf70711d91f6a3f788a8b3 <p><p> AXP Alpha Platform: SuSE-7.0 ftp://ftp.suse.de/pub/suse/axp/update/7.0/sec1/ssh-1.2.27-221.alpha.rpm 77bd0dcda5df929fba07d56de2bf3399 source rpm: ftp://ftp.suse.de/pub/suse/axp/update/7.0/zq1/ssh-1.2.27-221.src.rpm 77305ae844c9b68e8af559ccf81417e8 SuSE-6.4 ftp://ftp.suse.de/pub/suse/axp/update/6.4/sec1/ssh-1.2.27-86.alpha.rpm 7a8d7086c8b99822b020f3c9d0e4764e source rpm: ftp://ftp.suse.de/pub/suse/axp/update/6.4/zq1/ssh-1.2.27-86.src.rpm e75660e54edc2cf38086b4de3da91881 SuSE-6.3 ftp://ftp.suse.de/pub/suse/axp/update/6.3/sec1/ssh-1.2.27-212.alpha.rpm 671761326c11c9eac50c3d992b550bdf source rpm: ftp://ftp.suse.de/pub/suse/axp/update/6.3/zq1/ssh-1.2.27-212.src.rpm 5472b658aac01bea8667769a04e0e92d <p><p> PPC Power PC Platform: SuSE-7.0 ftp://ftp.suse.de/pub/suse/ppc/update/7.0/sec1/ssh-1.2.27-220.ppc.rpm ec7274c8a88b6ce5420c91da0622f94c source rpm: ftp://ftp.suse.de/pub/suse/ppc/update/7.0/zq1/ssh-1.2.27-220.src.rpm 1ae9f7cf4c7099f5cad8cb0ccc8f3e5d SuSE-6.4 ftp://ftp.suse.de/pub/suse/ppc/update/6.4/sec1/ssh-1.2.27-86.ppc.rpm fc3cb2e3b927c7ffc5e8374e183f860e source rpm: ftp://ftp.suse.de/pub/suse/ppc/update/6.4/zq1/ssh-1.2.27-86.src.rpm 439abdfb6f56e2c0d3880cddd103935f <p><p>______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - The openssh package URLs and md5sums: ftp://ftp.suse.de/pub/suse/i386/update/7.1/sec1/openssh-2.3.0p1-5.i386.rpm 3687c385e3e8f6e845c17518c12dd61b ftp://ftp.suse.de/pub/suse/i386/update/7.1/zq1/openssh-2.3.0p1-5.src.rpm 3cf3a1f652d92d66e70bfc9c40c0eb38 ftp://ftp.suse.de/pub/suse/i386/update/7.0/sec1/openssh-2.3.0p1-0.i386.rpm ce12abcff3dec118ceabe62e6cd1e090 ftp://ftp.suse.de/pub/suse/i386/update/7.0/zq1/openssh-2.3.0p1-0.src.rpm 3a7cf864f695a9f3ec2dd0bf6cc7e161 ftp://ftp.suse.de/pub/suse/i386/update/6.4/sec1/openssh-2.3.0p1-0.i386.rpm 3219bf7853c2c27056ec502b5fd3345c ftp://ftp.suse.de/pub/suse/i386/update/6.4/zq1/openssh-2.3.0p1-0.src.rpm 82a18d49a9a98942417258ffcd7a4800 ftp://ftp.suse.de/pub/suse/i386/update/6.3/sec1/openssh-2.3.0p1-0.i386.rpm 3219bf7853c2c27056ec502b5fd3345c ftp://ftp.suse.de/pub/suse/i386/update/6.3/zq1/openssh-2.3.0p1-0.src.rpm 82a18d49a9a98942417258ffcd7a4800 ftp://ftp.suse.de/pub/suse/axp/update/7.0/sec1/openssh-2.3.0p1-0.alpha.rpm b924315c09cb990009b24d3c1093e142 ftp://ftp.suse.de/pub/suse/axp/update/7.0/zq1/openssh-2.3.0p1-0.src.rpm 6339a4f2a4982ba2e6b943a182d02420 ftp://ftp.suse.de/pub/suse/axp/update/6.4/sec1/openssh-2.3.0p1-0.alpha.rpm 61da28e2695d8f4a4b1c6300d867e6b6 ftp://ftp.suse.de/pub/suse/axp/update/6.4/zq1/openssh-2.3.0p1-0.src.rpm 9e8e5af8b890f2a18e244da1c94be796 ftp://ftp.suse.de/pub/suse/ppc/update/7.0/sec1/openssh-2.3.0p1-0.ppc.rpm 72f7c339991e54a476585012423dda62 ftp://ftp.suse.de/pub/suse/ppc/update/7.0/zq1/openssh-2.3.0p1-0.src.rpm 749ccc55396944ad43c1977e55903958 ftp://ftp.suse.de/pub/suse/ppc/update/6.4/sec1/openssh-2.3.0p1-0.ppc.rpm e08ec87634dfd0dd76d18886d04ebd4b ftp://ftp.suse.de/pub/suse/ppc/update/6.4/zq1/openssh-2.3.0p1-0.src.rpm 95820e1934a5586c8d73719957972d7c ftp://ftp.suse.de/pub/suse/sparc/update/7.0/sec1/openssh-2.3.0p1-0.sparc.rpm 8ed7a34fec7bcc6c658809effe20fd82 ftp://ftp.suse.de/pub/suse/sparc/update/7.0/zq1/openssh-2.3.0p1-0.src.rpm c551925107c7000fa32556dbe4a4fad4 <p> - Linux kernel upgrade. Several security flaws have been found in the linux-2.2.x kernel versions. The only suitable workaround is to upgrade to a newer kernel version. SuSE provides kernels that have been expanded with several dozen device drivers that are not included in the standard main stream kernel. While working on the kernel update packages for our distributions, more security problems were discovered. Currently, several persons audit code in the kernel, so that more problems are expected to be discovered in the very near future. Since kernel updates are very time-consuming on behalf of the system administrator, we decided to not publish a new kernel package each week. Instead, the new kernel packages with all known security bugs fixed will be published by the midth/end of next week. In the meanwhile, administrators who require immediate updates, please go to ftp.kernel.org (or one of its mirrors, respectively) and get Alan Cox' prepatches for the 2.2.19 version of the Linux kernel. The directory usually is /pub/linux/kernel/people/alan/2.2.19pre, his latest patch is pre-patch-2.2.19-13.gz. This patch fixes all currently publically known security problems in the Linux v2.2 kernel. For those who are not experienced in patching and installing kernels, we recommend to wait for the release of the SuSE Linux kernel update packages. <p> - From SuSE-SA:2001:03 (bind8): The sparc update packages were pending because of build bottlenecks. The URLs to the update packages and the md5sums are as follows: SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/bind8-8.2.3-39.sparc.rpm c7e2a95bd4b90d03207ffc3a9880c36c source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/bind8-8.2.3-39.src.rpm 5d4d4b608f2a8a3e61f7dc6917254f4f <p><p> - bind: The bind package version 4.x has been found vulnerable to multiple security problems that were discussed and published in public security forums. See http://www.securityfocus.com/templates/advisory.html?id=3051 for more information. SuSE provides update packages for the bind nameserver in version 4 for all distributions and architectures. We also hereby announce that the bind package (bind-4.x; the bind nameserver in version 8 is contained in the bind8 package) will be discontinued in future versions of the SuSE Linux Distribution. We recommend to migrate to bind in the 8.x or 9.x series. There will be a seperate security announcement for the bind (4.x) package by Monday, February 19th 2001. In the meanwhile, get the md5sums from the URL ftp://ftp.suse.de/private/draht/bind4-checksums . It is signed. - More announcements are following this one. (mysql, tmpfile races, ...) Please read (this) section 2) in the announcements carefully. ______________________________________________________________________________ 3) standard appendix: 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 information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. 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 2048/3D25D3D9 1999/03/06 SuSE Security Team <security@suse.de> - -----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.3i 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 L0oixF12Cg== =pIeS - -----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv iQEVAwUBOo1ck3ey5gA9JdPZAQFXJAgAle2SSB5ddOCY2fk3rzphFmqW7Loh+7KQ jijyw1SQO2/aJsEjszMVGEmlnwJD0H8wOuTrHJzWvl4/lefC+D1qM2Lpd+yJTyus tKdzGIESSmrhXD652iBndB+kpYmMmcRKx7KgBrr9/+q9Z6UNTRUy+8N7ClRoZmuM srLN7KA2yuHDNVwUelmyeHOh3gQGeyKGuBXI8wg3IxQgr2C+64kUyuruTqnG196m GirfMhCKIH1hTdhuM63JZBp6LxQ1rkv8Cd9EeFMm5kL+0yTKU0dv4nO1GHBYe3TD wKkHpENOjGBqEb4jQe/syT/DvBqo8HH5fm9OA9j/R4onEDErFJJqYw== =/AJH -----END PGP SIGNATURE-----