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SUSE Security Summary Report
Announcement-ID: SUSE-SR:2005:004 Date: Friday, Feb 11th 2005 15:00 MEST Cross References: CAN-2005-0155 CAN-2004-0452 CAN-2005-0077
Content of this advisory: 1) solved security vulnerabilities: - ruby CGI denial of service - perl local privilege escalation - perl-DBI temp race condition - konversation multiple security fixes
2) pending vulnerabilities, solutions, workarounds: - problems with kernel update for SUSE Linux 9.1 - IDN cloaking problems with all browsers - multiple enscript problems - multiple wget problems
3) standard appendix (further information)
1) solved security vulnerabilities
To avoid spamming lists with advisories for every small incident, we will release weekly summary advisories for issues where we have released updates without a full advisory. Since these are minor issues, md5sums and ftp URLs are not included.
Fixed packages for the following incidents are already available on our FTP server and via the YaST Online Update.
- ruby CGI denial of service
A denial of service attack against the ruby CGI scripts was fixed which could lead to an endless loop when the connections was terminated unexpectedly.
All SUSE Linux based products were affected.
- perl local privilege escalation.
SUSE Linux by default does not ship the setuid perl versions set to setuid root, so if you did not change the permissions, this will not affect you.
An unchecked variable access in perl debugging could lead a local attacker to gain root access by either overwriting random system files or overflowing a buffer on the stack. This issue is tracked by the Mitre CVE ID CAN-2005-0155.
Additionally a file deletion race was fixed in File::Path::rmtree, which is tracked by the Mitre CVE ID CAN-2004-0452.
Only SUSE Linux based products with modified permission of the sperl5.0.x interpreter are affected.
- perl-DBI temp race condition
The Debian Security Audit project found a small temporary file race condition in the perl DBI module. This has been assigned the Mitre CVE ID CAN-2005-0077.
All SUSE Linux based products were affected.
- multiple konversation problems
Multiple problems in the konversation messenger client were found and fixed by Wouter Coekaerts:
- Quick buttons: Sometimes passed strings were evaluated as QT format strings, leading to potential insertion of commands.
- Included Perl scripts are vulnerable to shell command injection attacks.
- Nick and password confused in quick connect dialog, potentially leading to using the password as a nickname.
All SUSE Linux box products were affected.
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- problems with kernel update for SUSE Linux 9.1
Several users of NVidia cards reported problems with the last SUSE Linux 9.1 kernel update, leaving the screen black and the machine hung after reboot.
We are working on a fix for this problem.
Up to then our NVidia customers use the OpenSource driver "nv", not install the last kernel update and/or fall back to the previous one.
- multiple wget problems
We have still no solution for the wget issues as reported on Bugtraq: http://www.securityfocus.com/archive/1/383998
- IDN (Internationalized Domain Name) cloaking / homograph attacks
Problems with the IDN / punycode handling that allows non-ASCII domain names were reported for every browser.
We are aware of these issues and expect a good solution soon.
- multiple enscript problems
The text to postscript converter enscript has several security related problems, relating to input validation (CAN-2004-1184), missing sanitizing of filenames (CAN-2004-1185) and multiple buffer overflows (CAN-2004-1186). Updates are currently tested. ______________________________________________________________________________
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 firstname.lastname@example.org), the checksums show proof of the authenticity of the package. We recommend against subscribing to security lists that cause the e-mail 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 file name 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 "email@example.com" 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:
firstname.lastname@example.org - general/linux/SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an email to email@example.com.
firstname.lastname@example.org - SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an email to email@example.com.
===================================================================== SUSE's security contact is firstname.lastname@example.org or email@example.com. The firstname.lastname@example.org 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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