SuSE Inc. Information for VU#734644

ISC BIND 8 vulnerable to cache poisoning via negative responses

Status

Affected

Vendor Statement

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

SUSE Security Announcement

Package:                bind8
Announcement-ID:        SuSE-SA:2003:047
Date:                   Friday, Nov 28th 2003 15:30 MEST
Affected products:      7.3, 8.0, 8.1, 8.2
Vulnerability Type:     cache poisoning/denial-of-service
Severity (1-10):        5
SUSE default package:   yes
Cross References:       CAN-2003-0914


Content of this advisory:
1) security vulnerability resolved:

- caching negative answers
problem description, discussion, solution and upgrade information

2) pending vulnerabilities, solutions, workarounds:
- ethereal
- KDE
- mc
- apache1/2
- gpg
- freeradius
- xscreensaver
- screen
- mod_gzip
- gnpan

3) standard appendix (further information)

______________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

To resolve IP addresses to host and domain names and vice versa the
DNS service needs to be consulted. The most popular DNS software is
the BIND8 and BIND9 suite. The BIND8 code is vulnerable to a remote
denial-of-service attack by poisoning the cache with authoritative
negative responses that should not be accepted otherwise.
To execute this attack a name-server needs to be under malicious
control and the victim's bind8 has to query this name-server.
The attacker can set a high TTL value to keep his negative record as
long as possible in the cache of the victim. For this time the clients
of the attacked site that rely on the bind8 service will not be able
to reach the domain specified in the negative record.
These records should disappear after the time-interval (TTL) elapsed.


There is no temporary workaround for this bug.

To make this update effective run "rcnamed restart" as root please.

Please 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 to install from the maintenance web.



Intel i386 Platform:

SuSE-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/bind8-8.3.4-64.i586.rpm
3d44d46f0e8397c69d53e96aba9fbd6d
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/bind8-8.3.4-64.i586.patch.rpm
cce1df09a0b6fb5cbbddcc462f055c64
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/bind8-8.3.4-64.src.rpm
a980a0eca79de02f135fce1cbe84ee22

SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/bind8-8.2.4-336.i586.rpm
4a46d0560eac1ca5de77c12f8abe4952
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/bind8-8.2.4-336.i586.patch.rpm
c8020302f6f161e9d86a3f1615304a23
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/bind8-8.2.4-336.src.rpm
c9ee184cbd1f1722c94de9fd66f11801

SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/bind8-8.2.4-334.i386.rpm
f739fdb03a7df6685e0aa026f98a0389
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/bind8-8.2.4-334.i386.patch.rpm
a3de26e06b689d29b4b4b08c04fa32f4
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/bind8-8.2.4-334.src.rpm
85d8d9fee3c8a029263777a45b4af011

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/bind8-8.2.4-334.i386.rpm
381c2b6f805ca30d0fefc98afaee9ba0
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/bind8-8.2.4-334.src.rpm
97a87469cfb573bdd89f8f3a2c02264f



Sparc Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/bind8-8.2.4-128.sparc.rpm
c08454b933ed2365d9d2ab1322803af6
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/bind8-8.2.4-128.src.rpm
827a7f56273c7a25ac40ffba728e9150



PPC Power PC Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/bind8-8.2.4-243.ppc.rpm
12f1f205c08449e945c8ad344a8e3b41
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/bind8-8.2.4-243.src.rpm
177093e76b3b8d2679089a1ab1c46d0e

______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

- ethereal
A new official version of ethereal, a network traffic analyzer, was
released to fix various security-related problems.
An update package is currently being tested and will be released
as soon as possible.


- KDE
New KDE packages are currently being tested. These packages fixes
several vulnerabilities:

+ remote root compromise (CAN-2003-0690)
+ weak cookies (CAN-2003-0692)
+ SSL man-in-the-middle attack
+ information leak through HTML-referrer (CAN-2003-0459)
+ wrong file permissions of config files

The packages will be release as soon as testing is finished.

- mc
By using a special combination of links in archive-files it is possible
to execute arbitrary commands while mc tries to open it in its VFS.
The packages are currently tested and will be release as soon as
possible.


- apache1/2
The widely used HTTP server apache has several security vulnerabilities:

- locally exploitable buffer overflow in the regular expression code.
The attacker must be able to modify .htaccess or httpd.conf.
(affects: mod_alias and mod_rewrite)

- under some circumstances mod_cgid will output its data to the
wrong client (affects: apache2)

The new packages are available on our FTP servers.


- gpg
In GnuPG version 1.0.2 a new code for ElGamal was introduced.
This code leads to an attack on users who use ElGamal keys for
signing. It is possible to reconstruct the private ElGamal key
by analyzing a public ElGamal signature.
Please note that the ElGamal algorithm is seldomly used and GnuPG
displays several warnings when generating ElGamal signature keys.
The default key generation process in GnuPG will create a DSA signature
key and an ElGamal subkey for _encryption only_. These keys are not
affected by this vulnerability.
Anyone using ElGamal signature keys (type 20, check fourth field of
"gpg --list-keys --with-colon" output) should revoke them.


- freeradius
Two vulnerabilities were found in the FreeRADIUS package.
The remote denial-of-service attack bug was fixed and new packages
will be released as soon as testing was successfully finished.
The other bug is a remote buffer overflow in the module rlm_smb.
We do not ship this module and will fix it for future releases.


- xscreensaver
The well known screen-saver for X is vulnerable to several local
tmp file attacks as well as a crash when verifying a password.
Only SuSE Linux 9.0 products are affected.
The new packages are available on our FTP servers.


- screen
A buffer overflow in screen was reported. Since SuSE Linux 8.0
we do not ship screen with the s-bit anymore. An update package
will be released for 7.3 as soon as possible.


- mod_gzip
The apache module mod_gzip is vulnerable to remote code execution
while running in debug-mode. We do not ship this module in debug-mode
but future versions will include the fix.


- gnpan
A remote denial-of-service attack can be run against the GNOME
news-reader program gnpan. This bug affects SuSE Linux 8.0, 8.1, 8.2.
Update packages are available on our FTP servers.


______________________________________________________________________________

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 disrecommend to subscribe to security lists which cause the
email 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
filename of the rpm package that you have downloaded. Of course,
package authenticity verification can only target an un-installed 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>.
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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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see
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Bye,
Thomas

--
Thomas Biege <thomas@suse.de>, SUSE LINUX AG, Security Support & Auditing

"lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka"
Key fingerprint = 51 AD B9 C7 34 FC F2 54  01 4A 1C D4 66 64 09 83

--
... stay with me, safe and ignorant, go back to sleep...

- Maynard James Keenan

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References

None

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.