-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: susehelp Announcement-ID: SuSE-SA:2001:041 Date: Thu Nov 22 11:36:00 MET 2001 Affected SuSE versions: 7.2, 7.3 Vulnerability Type: remote command execution Severity (1-10): 8 SuSE default package: yes Other affected systems: no Content of this advisory: 1) security vulnerability resolved: CGI vulnerability in susehelp. 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 susehelp package contains several CGI-scripts to provide a flexible help-system to the user. Some of these scripts open files in an insecure manner, thus allowing remote attackers to execute arbitrary commands as wwwrun-user on the server running susehelp package. These bugs have been fixed in the newly available packages. Please update your susehelp package immediately if present on your system. SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/doc1/susehelp-2001.09.06-110.noarch.rpm 8b441a44bda65f5e162d326d1e6ed1df source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/susehelp-2001.09.06-110.src.rpm 9e38fa3bbc650974c8138981754610b6 SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/doc1/susehelp-2001.05.14-41.noarch.rpm 27789618aeb317225c8262016afb65b9 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/susehelp-2001.05.14-41.src.rpm fd5a85ebada13eb6de95067b066746c0 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - The ziptool program runs setuid root in the easy permission mode and contains an overflow which allows local attackers to gain root privileges. A zipdrive must be configured and a zipdisk being inserted in order to exploit the bug. The overflow has been fixed. Please update your packages. - The ncpfs package containing the setuid root programs ncpmount and ncpumount was vulnerable to local bufferoverflow attacks. The package has been fixed. ______________________________________________________________________________ 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. 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