SUSE Security Summary Report (SUSE-SR:2005:011)
Posted on: 04/15/2005 07:35 AM

A security summary report from SUSE:

______________________________________________________________________________

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 lt;name-of-the-file.rpmgt;
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 lt;file.rpmgt;
to verify the signature of the package, where lt;file.rpmgt; 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 lt; 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
lt;suse-security-subscribe@suse.comgt;.

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
lt;suse-security-announce-subscribe@suse.comgt;.

For general information or the frequently asked questions (FAQ)
send mail to:
lt;suse-security-info@suse.comgt; or
lt;suse-security-faq@suse.comgt; respectively.

====================================================================
SUSE's security contact is lt;security@suse.comgt; or lt;security@suse.degt;.
The lt;security@suse.degt; 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 lt;security@suse.degt;
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key lt;build@suse.degt;

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