SUSE Security Summary Report SUSE-SR:2005:006
Posted on: 02/25/2005 10:44 AM

A Security Summary Report from SUSE:


______________________________________________________________________________

SUSE Security Summary Report

Announcement-ID: SUSE-SR:2005:006
Date: Fri, 25 Feb 2005 15:00:00 +0000
Cross References: CAN-2005-0100


Content of this advisory:
1) solved security vulnerabilities:
- emacs/XEmacs movemail helper problem
- wpa_supplicant remote denial of service
- FreeNX authentication bug
- php4 readfile denial of service

2) pending vulnerabilities, solutions, workarounds:
- cyrus-sasl buffer overflow
- curl NTLM authentication buffer overflow
- IMAP cram-md5 authentication problem
- IDN cloaking problems with all browsers
- multiple wget problems
- new PostgreSQL problems
- New kernel security 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.

- emacs/XEmacs movemail helper problem

Format string bugs were fixed in helper application movemail of both
emacs and XEmacs which could be used to execute arbitrary code.

This is tracked by the Mitre CVE ID CAN-2005-0100.

All SUSE Linux based products are affected.


- wpa_supplicant remote denial of service

A buffer overflow was identified in the EAPOL-Key frame handling code
of wpa_supplicant which can be used to remotely crash wpa_supplicant.

SUSE Linux 9.2 is affected by this problem.


- FreeNX authentication bug

This update of FreeNX fixes the insecure handling of the X authentication.
If the XAUTHORITY variable is not set nxagent falsely allows all local
users access to the X server.


- php4 readfile denial of service

A bug in the readfile() function of php4 could be used to
to crash the httpd running the php4 code when accessing files
with a multiple of the architectures page size leading to a denial
of service.

This bug affects SUSE Linux 9.0, SUSE Linux 9.1 and SUSE Linux
Enterprise Server 9.
______________________________________________________________________________

2) Pending vulnerabilities in SUSE Distributions and Workarounds:

- cyrus-sasl buffer overflow

A buffer overflow in the digestmda5 code in cyrus-sasl was found
which allows remote attackers to execute arbitrary code (if
cyrus-sasl is used). This is tracked by the Mitre ID CAN-2005-0373.

All SUSE Linux based products are affected, updated packages
are currently in testing.


- curl NTLM authentication buffer overflow

infamous41md@hotpop.com reported a vulnerability in libcurl, the
HTTP/FTP retrieval library. This library is used by lots of programs,
including YaST2.

The NTLM authorization in curl had a buffer overflow in the base64
decoding which allows a remote attacker using a prepared remote
server to execute code for the user using curl.

The Kerberos authorization has a similar bug, but is not compiled
in on SUSE Linux.

This affects all SUSE Linux based distributions, updated packages
are currently in testing.


- IMAP cram-md5 authentication problem

A logical error in the challenge response authentication mechanism
CRAM-MD5 was found in the University of Washington IMAP daemon.
Due to this mistake a remote attacker can gain access to the IMAP
server as arbitrary user.

This is tracked by the Mitre CVE ID CAN-2005-0198.

All SUSE Linux based distributions are affected, updated packages
are currently in testing.


- multiple wget problems

We are currently 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.

We are aware of these issues and expect a good solution soon.

- new 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

- Multiple buffer overflows were found in PL/PgSQL. CAN-2005-0245,
CAN-2005-0247

- A flaw in contrib/intagg CAN-2005-0246

We are working on updates for this problem.


- New kernel security problems

New kernel security problems in regards to signedness issues have
been spotted by Georgi Guninski.

We are working on updates for this problems.

______________________________________________________________________________

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;.
@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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