Mailinglist Archive: opensuse-security (145 mails)

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SUSE Security Announcement: samba (SUSE-SA:2004:040)
  • From: Marcus Meissner <meissner@xxxxxxx>
  • Date: Mon, 15 Nov 2004 21:18:54 +0100
  • Message-id: <41990F2E.mail29Q11Q2RE@xxxxxxx>

______________________________________________________________________________

SUSE Security Announcement

Package: samba
Announcement-ID: SUSE-SA:2004:040
Date: Monday, Nov 15th 2004 18:00 MEST
Affected products: 9.1, 9.2
SUSE Linux Enterprise Server 9
Novell Linux Desktop 9
Vulnerability Type: potential remote buffer overflow
remote denial of service
Severity (1-10): 7
SUSE default package: yes
Cross References: CAN-2004-0930
CAN-2004-0882

Content of this advisory:
1) security vulnerabilities resolved:
- remote buffer overflow and remote denial of service conditions
in Samba 3 packages.
problem description
2) solution/workaround
3) special instructions and notes
4) package location and checksums
5) pending vulnerabilities, solutions, workarounds:
- bogofilter
- libxml2
- clamav
- various PDF viewers
- mozilla /tmp issues
- sharutils
- phpMyAdmin
- gaim
- sysconfig
- perl-MIME-Tools, perl-Archive-ZIP
- apache / mod_include
- apache2 / mod_SSL

6) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion

There is a problem in the Samba file sharing service daemon, which
allows a remote user to have the service consume lots of computing
power and potentially crash the service by querying special wildcarded
filenames.

This attack can be successful if the Samba daemon is running and a
remote user has access to a share (even read only).

The Samba team has issued the new Samba version 3.0.8 to fix this
problem, this update backports the relevant patch.

This issue has been assigned the Mitre CVE ID CAN-2004-0930.


Stefan Esser found a problem in the Unicode string handling in the
Samba file handling which could lead to a remote heap buffer
overflow and might allow remote attackers to inject code in the smbd
process.

This issue has been assigned the Mitre CVE ID CAN-2004-0882.


We provide updated packages for both these problems.

The Samba version 2 packages are not affected by this problem.

2) solution/workaround

Update to the released packages.

The only workaround would be not to use Samba.

3) special instructions and notes

Restart the Samba daemon by entering the following command as root:

rcsmb try-restart

4) package location and checksums

Download the update package for your distribution and verify its
integrity by the methods listed in section 3) of this announcement.
Then, install the package using the command "rpm -Fhv file.rpm" to apply
the update.
Our maintenance customers are being notified individually. The packages
are being offered for installation from the maintenance web.


x86 Platform:

SUSE Linux 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/samba-3.0.7-5.2.i586.rpm
ea47b14d991eadfc8319d248441eb6cc
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/samba-3.0.7-5.2.i586.patch.rpm
097048624c2ca75d66113c994e278bf8
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/samba-3.0.7-5.2.src.rpm
e90db6a68fca1660ecb1f3e833034b14

SUSE Linux 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/samba-3.0.4-1.34.3.i586.rpm
2701bcc3f8a702828a84ca6ee6f58c47
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/samba-3.0.4-1.34.3.i586.patch.rpm
2ec25548844d0741ece92ea34726b962
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/samba-3.0.4-1.34.3.src.rpm
ce60179f36ea0005df7c69b64849b387


x86-64 Platform:

SUSE Linux 9.2:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/samba-3.0.7-5.2.x86_64.rpm
13b65db6a9cd46df94cd5171d4c3b916
patch rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/samba-3.0.7-5.2.x86_64.patch.rpm
0e7dd46cc7187ae3a7419dfdb8cdd1b8
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/samba-3.0.7-5.2.src.rpm
e90db6a68fca1660ecb1f3e833034b14

SUSE Linux 9.1:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/samba-3.0.4-1.34.3.x86_64.rpm
8b442529ac042ecea469972c2c85e4b5
patch rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/samba-3.0.4-1.34.3.x86_64.patch.rpm
f3c95f1940f05652393a178b6a12e226
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/samba-3.0.4-1.34.3.src.rpm
053403aa610ea0df5b6337934e753acc

______________________________________________________________________________

5) Pending vulnerabilities in SUSE Distributions and Workarounds:

A lot of less important issues have been addressed since the last
security update. To avoid spamming they are summarized here.

- bogofilter

The bogofilter team has notified us about a denial of service condition
in bogofilter on SUSE Linux 9.2, where a non-conformant encoded word
could lead to a denial of service attack against bogofilter. This issue
has been assigned Mitre CVE ID CAN-2004-1007. Fixed packages are
available.

- libxml2

Several buffer overflows in URL handling in libxml2 were found by
"infamous41md". This issue has been assigned the Mitre CVE ID
CAN-2004-0989. Fixed packages are available.

- clamav

The clamav version shipped with SUSE Linux is too old for the new
data files. The version has been upgraded to 0.80.

- various xpdf based PDF viewers

The SUSE QA team found several 64-bit issues in the xpdf fixes
we released for CAN-2004-0888 and CAN-2004-0889. These have been
fixed and updated packages have been released.

- Mozilla /tmp issues

The creation of several /tmp files in Mozilla and Mozilla based
programs left private files with world readable permissions so that
local users could read documents of other users. Packages fixing
this problem have been released.

- sharutils

Buffer overflows and shell quoting problems have been found in the
"shar" program which creates self-extracting shell archives.
Fixed packages are available.

- phpMyAdmin

Missing parameter escapes allowed users of the phpMyAdmin frontend
to execute commands as the www user on the target host. Fixed packages
are available.

- gaim

More problems in newer versions of GAIM have been found and are tracked
with the Mitre CVE ID CAN-2004-0891. Fixed packages are available.

- sysconfig

A permission error left the passphrase of WPA authorized wireless
key world readable in SUSE Linux 9.2. Fixed packages are available.

- perl-Mime-Tools / perl-Archive-ZIP

Problems in the perl-MIME-Tools and perl-Archive-ZIP packages have
been found which could allow virii to pass virus scanners using those
packages (like for instance clamav). Fixed packages are in testing
and will be released soon.

- Apache 1.3 / mod_include

A potential buffer overflow and a argument sanitization problem
were found in the mod_include Apache 1.3 module. These issues
are tracked as CAN-2004-0940 and CAN-2004-0492 by Mitre CVE.
Fixed packages are in testing and will be released soon.

- Apache 2 / mod_SSL

SSL Ciphersuite bypass problems were identified and fixed by the
Apache team in Apache 2. This is tracked under the Mitre CVE ID
CAN-2004-0885. Fixed packages are in testing and will be released
soon.

______________________________________________________________________________

6) 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@xxxxxxx),
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@xxxxxxx" 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@xxxxxxxx
- general/linux/SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an email to
<suse-security-subscribe@xxxxxxxx>.

suse-security-announce@xxxxxxxx
- 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@xxxxxxxx>.

For general information or the frequently asked questions (faq)
send mail to:
<suse-security-info@xxxxxxxx> or
<suse-security-faq@xxxxxxxx> respectively.

=====================================================================
SUSE's security contact is <security@xxxxxxxx> or <security@xxxxxxx>.
The <security@xxxxxxx> 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@xxxxxxx>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@xxxxxxx>

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