-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: openssh Announcement-ID: SuSE-SA:2003:038 Date: Tuesday, Sep 16 2003 22:15 MEST Affected products: 7.2, 7.3, 8.0, 8.1, 8.2 SuSE Linux Database Server, SuSE eMail Server III, 3.1 SuSE Linux Enterprise Server 7, 8 SuSE Linux Firewall on CD/Admin host SuSE Linux Connectivity Server SuSE Linux Office Server SuSE Linux Standard Server 8 Vulnerability Type: potential remote privilege escalation Severity (1-10): 8 SuSE default package: yes Cross References: http://www.openssh.com/txt/buffer.adv CERT VU#333628 CVE CAN-2003-0693 Content of this advisory: 1) security vulnerability resolved: openssh 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 The openssh package is the most widely used implementation of the secure shell protocol family (ssh). It provides a set of network connectivity tools for remote (shell) login, designed to substitute the traditional BSD-style r-protocols (rsh, rlogin). openssh has various authentification mechanisms and many other features such as TCP connection and X11 display forwarding over the fully encrypted network connection as well as file transfer facilities. A programming error has been found in code responsible for buffer management. If exploited by a (remote) attacker, the error may lead to unauthorized access to the system, allowing the execution of arbitrary commands. The error is known as the buffer_append_space()-bug and is assigned the Common Vulnerabilities and Exposures (CVE) name CAN-2003-0693. At the time of writing this announcement, it is unclear if the buffer_append_space()-bug is exploitable. However, an increasing amount of TCP connection attempts to port 22 (the ssh default port) has been observed in the internet during the past days, which may indicate that there exists an exploit for the error. Please note that we have disabled the Privilege Separation feature in the ssh daemon (sshd) with this update. The PrivSep feature is designed to have parts of the ssh daemon's work running under lowered privileges, thereby limiting the effect of a possible vulnerability in the code. The PrivSep feature is turned on/off by the UsePrivilegeSeparation keyword in sshd's configuration file /etc/ssh/sshd_config. The feature is held responsible for malfunctions in PAM (Pluggable Authentification Modules). The update mechanism will not overwrite configuration files that have been altered after the package installation. SPECIAL INSTALL INSTRUCTIONS: ============================== After the update has been successfully applied, the ssh daemon (sshd) must be restarted for update package to become effective. To restart the ssh daemon after the update, please run the following command as root: rcsshd restart 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. Intel i386 Platform: SuSE-8.2: ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/openssh-3.5p1-106.i586.rpm 492d66deaedcfc20c1f0d66e508db790 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/openssh-3.5p1-106.i586.patch.rpm c362fedfda79824cb40cd4e5e1055aee source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/openssh-3.5p1-106.src.rpm 0381b9b4818f8b669631bcab9be80fb5 SuSE-8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssh-3.4p1-214.i586.rpm dda7728501c8cf17c60eff1862922842 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssh-3.4p1-214.i586.patch.rpm d02dfc049413b725c4255887487cfa67 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/openssh-3.4p1-214.src.rpm 26dd44e9bed7a5ad2d35e56301dc5489 SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-214.i386.rpm 2361dccd5b0c83178f8d0d5988b3490e patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-214.i386.patch.rpm 5bef6aff5a603e3376a2f907c494ea7e source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/openssh-3.4p1-214.src.rpm 203aab39cdb7c5672a82bb07bc4a1f38 SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/openssh-2.9.9p2-155.i386.rpm 1418135ed33e59d1ce37ea135617b5bc source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/openssh-2.9.9p2-155.src.rpm 9d0b789127d30cca9f45c7b1f2268673 SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/openssh-2.9.9p2-155.i386.rpm e807ecd9c4d167e3ef3764c06af1a511 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/openssh-2.9.9p2-155.src.rpm a99aa03ba94f45dd25054b1ab1a962d7 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec1/openssh-2.9.9p2-52.sparc.rpm e4f9b7e8763464d60761faf94b7f80f9 source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/openssh-2.9.9p2-52.src.rpm ca0cbe5b564b03c64458868db369c4de PPC Power PC Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec1/openssh-2.9.9p2-108.ppc.rpm 0166ec0aec482b687bc2891611ae8ae9 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/openssh-2.9.9p2-108.src.rpm aed7879361a85f263a1cb3a00de964a1 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - A buffer overflow vulnerability has been found in the mysql package, an Open Source relational database system. The error may allow a remote attacker to execute arbitrary code with the privileges of the database process. We are in the process of building and testing the update packages and will release them with a SuSE Security Announcement 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 <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 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 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 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. 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