______________________________________________________________________________

SUSE Security Summary Report

Announcement-ID: SUSE-SR:2005:009
Date: Tue, 29 Mar 2005 15:00:00 +0000
Cross References: CAN-2005-0469
CAN-2005-0468

Content of this advisory:
1) solved security vulnerabilities:
- telnet

2) pending vulnerabilities, solutions, workarounds:
- kernel bluetooth security problem
- wget directory traversal problem
- IDN domain name cloaking problems
- PostgreSQL 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.

Only one problem was released without advisory this week, but please
read the additional notes on the kernel problem in the pending
section.

- telnet

Several vulnerabilities were fixed in the telnet client.

A buffer overflow in the LINEMODE sub option command SLC can be
exploited by a malicious server to execute arbitrary code on
the client site with the privileges of the user running telnet.

This is tracked by the Mitre CVE ID CAN-2005-0469.


Another buffer overflow can be exploited remotely via a malicious
server by sending environment variables to the client. The result
of this bug is arbitrary code execution too.

This is tracked by the Mitre CVE ID CAN-2005-0468.

Note that this bug can also be exploited by clicking on a URL
link that uses telnet:// as protocol and points to a server
controlled by an attacker.

All SUSE Linux based distributions are affected by this problem.
______________________________________________________________________________

2) Pending vulnerabilities in SUSE Distributions and Workarounds:

- New kernel bluetooth security problems

A security problem was found in the kernels bluetooth stack,
allowing a local attacker to gain root access.

This works even if bluetooth is not enabled, since the problematic
modules are loaded on demand.

Until we have finished our updates please use one of the following
workarounds:

- Remove or move away the bluetooth core module.

On 2.6 kernels this is the file:
/lib/modules/<kernel version>/kernel/net/bluetooth/bluetooth.ko

On 2.4 kernels this is the file:
/lib/modules/<kernel version>/kernel/net/bluetooth/bluez.o

- Disable auto load of the bluetooth protocol module by commenting
out the line:
alias net-pf-31 bluez

in /etc/modules.conf (2.4 systems) or the line:
alias net-pf-31 bluetooth

in /etc/modprobe.conf (2.6 systems).


Make sure the module is not loaded, or run "rmmod bluetooth" /
"rmmod bluez".

- multiple wget problems

We are still working on updated packages 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.

- The KDE approach is currently filtering on the top level domain.
- The Mozilla approach is currently to display punycode.

We have released Mozilla Firefox updates for this problem, the others
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 working on updates for this problem.
______________________________________________________________________________

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 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 "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>.
@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.

Type Bits/KeyID Date User ID
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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