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SUSE Security Summary Report
Announcement-ID: SUSE-SR:2005:011 Date: Fri, 15 Apr 2005 13:00:00 +0000 Cross References: CAN-2005-0664 CAN-2005-0667 CAN-2005-0992 PMASA-2005-3 CAN-2005-0877 CAN-2005-0876 CAN-2005-0877
Content of this advisory: 1) solved security vulnerabilities: - wget directory traversal and dot file overwrite - libexif buffer overflow in EXIF parsing - sylpheed buffer overflow in header decoding - phpMyAdmin cross site scripting problem - dnsmasq buffer overflow and denial of service
2) pending vulnerabilities, solutions, workarounds: - IDN (Internationalized Domain Name) cloaking / homograph attacks - PostgreSQL problems - new Mozilla security problems - OpenOffice_org heap overflow 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.
- wget directory traversal and dot file overwrite
Two security problems were fixed in the wget download program which were reported earlier this year on full-disclosure.
- HTTP redirect statements could be used to do a directory traversal and write to files outside of the current directory.
- HTTP redirect statements could be used to overwrite dot (".") files potentially overwriting users .bashrc or similar files.
This update replaces dangerous directories and filenames by replacing the dot (".") with an underscore ("_").
This affects all SUSE distributions.
The SUSE Linux 9.3 update also fixes the incorrectly encoded german translations.
- libexif buffer overflow in EXIF parsing
A small buffer overflow in the libexif image processing library was fixed. This could lead to a denial of service or a potential remote code execution attack when processing handcrafted JPEG files.
This is tracked by the Mitre CVE ID CAN-2005-0664.
- sylpheed buffer overflow in header decoding
The mail user agent sylpheed does not do proper bounds checking while decoding mime encoded strings (for example in the Reply-To field). The bug occurs only for special local settings (like en_US.UTF-8) and can be abused by a remote attacker to execute arbitrary code with the privileges of the user receiving a malformed email.
All SUSE Linux products were affected.
This is tracked by the Mitre CVE ID CAN-2005-0667.
- phpMyAdmin cross site scripting problem
Another cross site scripting bug was found in phpMyAdmin.
All SUSE Linux products are affected.
This is tracked by the Mitre CVE ID CAN-2005-0992 and phpMyAdmin ID PMASA-2005-3.
- dnsmasq buffer overflow and denial of service
A buffer overflow was fixed in the dnsmasq masquerading DNS daemon. This could lead to a denial-of-service condition that can be triggered by an attacker being in the local network during restart. This is tracked by the Mitre CVE ID CAN-2005-0876.
Additionally a DNS cache poisoning attack can be launched easily to reroute traffic of applications using dnsmasq for DNS lookups. This is tracked by the Mitre CVE ID CAN-2005-0877.
SUSE Linux 9.2 and 9.3 are affected by this problem. ______________________________________________________________________________
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- IDN (Internationalized Domain Name) cloaking / homograph attacks
Problems with the IDN / punycode handling that allows non-ASCII domain names were reported for every browser.
- The KDE approach is currently filtering on the top level domain. - The Mozilla approach is currently to display punycode.
We have released Mozilla Firefox and KDE / konqueror updates for this problem, the others (Mozilla suite and opera) are still pending.
- PostgreSQL problems
Additional PostgreSQL problems were reported: - A local user could bypass the EXECUTE permission check for functions by using the CREATE AGGREGATE command. CAN-2005-0244
- Other earlier listed problems are already fixed.
We are still working on updates for this problem.
- new Mozilla security problems
Several new Mozilla browser security problems have been reported.
We are currently addressing these issues.
- OpenOffice_org heap overflow A heap overflow was found in the MS Word document handing of OpenOffice_org, allowing a remote attacker to execute code via a handcrafted .doc file.
We are preparing updates for this issue. ______________________________________________________________________________
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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