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The ISC (Internet Software Consortium) dhcp package is an imple- mentation of the "Dynamic Host Configuration Protocol" (DHCP). An internal source code audit done by ISC revealed several buffer overflows in the code which is responsible to handle dynamic DNS requests. These bugs allow an attacker to gain remote access to the dhcp server if the dynamic DNS feature is enabled. Dynamic DNS is not enabled by default on SuSE Linux.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: dhcp
Announcement-ID: SuSE-SA:2003:0006
Date: Monday, Jan 20th 2003 16:30 MET
Affected products: 7.1, 7.2, 7.3, 8.0, 8.1
SuSE Linux Database Server
SuSE eMail Server 3.1
SuSE eMail Server III
SuSE Linux Enterprise Server
SuSE Linux Connectivity Server
SuSE Linux Office Server
Vulnerability Type: remote system compromise
Severity (1-10): 4
SuSE default package: no
Cross References:
Content of this advisory:
1) security vulnerability resolved: buffer overflow in nsupdate code
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- fam
- xpdf
- libmcrypt
- gfxboot
- mod_php4
- wget
- IMP
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
The ISC (Internet Software Consortium) dhcp package is an imple-
mentation of the "Dynamic Host Configuration Protocol" (DHCP).
An internal source code audit done by ISC revealed several buffer
overflows in the code which is responsible to handle dynamic DNS
requests.
These bugs allow an attacker to gain remote access to the dhcp
server if the dynamic DNS feature is enabled.
Dynamic DNS is not enabled by default on SuSE Linux.
As temporary fix you can disable dynamic DNS support and restart your
dhcp server. Otherwise install the new packages from our FTP servers.
Please backup your lease file before updating the package.
After the package update you have to restart the dhcp server
This can be done by executing the following commands as root:
- rcdhcpd restart
or (for older versions):
- rcdhcp restart
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-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/dhcp-server-3.0.1rc9-59.i586.rpm
b93512def1ff7a566af1c0d32698ae54
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/dhcp-server-3.0.1rc9-59.i586.patch.rpm
4dba1190fed929dc732e5b714ec04c01
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/dhcp-3.0.1rc9-0.src.rpm
e95be7ef7c465f5df89130f2b718ca2b
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-base-3.0.1rc6-15.i386.rpm
04cf9fcc4f50b46b5acc17188b5731c4
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-base-3.0.1rc6-15.i386.patch.rpm
02ae79a92f6a906e6379fc9b844a2899
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/dhcp-3.0.1rc6-8.src.rpm
f17c08af58e335c6bc428283df620e3b
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/dhcrelay-3.0rc12-56.i386.rpm
f1433f875b45ee9d1ba4908fee76db26
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/dhcp-3.0rc12-56.src.rpm
e2523ad5843801d2d4b6ddbc410deb7b
SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/dhcp-devel-3.0rc4-32.i386.rpm
9f0f42381ff5acb13f42777d47486f23
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/dhcp-3.0rc4-32.src.rpm
15a2d5afbc0590d036b9d1c5604d8f5a
SuSE-7.1:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/dhcpcd-1.3.19pl2-1.i386.rpm
4bccb2397354916161ab24ab1055f514
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/dhcpcd-1.3.19pl2-1.src.rpm
fa6bbd04a8510fdf874b17d4a6a38517
Sparc Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/dhcp-devel-3.0rc12-26.sparc.rpm
3bdc8877b3ae483066ad59b58a2f6500
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/dhcp-3.0rc12-26.src.rpm
821121c8b3aec15039e3e2ae2b352b0d
AXP Alpha Platform:
SuSE-7.1:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/dhcpcd-1.3.19pl6-0.alpha.rpm
7ea88d937f39f3c8dc95c139a2925dae
source rpm(s):
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/dhcpcd-1.3.19pl6-0.src.rpm
b7ec2409fb5f53df480cbe3dae0c5942
SuSE-7.0:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/dhcpcd-1.3.18p8-11.alpha.rpm
a84bacf848a1a2da31ab6827c85017a2
source rpm(s):
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/dhcpcd-1.3.18p8-11.src.rpm
d0bbe10ba9a362308b9a0caf4b5fa209
PPC Power PC Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/dhcp-devel-3.0rc12-39.ppc.rpm
191ca180aa1aa60f17d5321e2564ac32
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/dhcp-3.0rc12-39.src.rpm
8eb0831beb4402992ef9385e22fa542c
SuSE-7.1:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/dhcpcd-1.3.19pl2-1.ppc.rpm
00fb6f92ffa1d66cab5792c032d4a713
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/dhcpcd-1.3.19pl2-1.src.rpm
94067dccc6717b56d26a194f661ce2e5
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- fam
SuSE Versions < 8.0 are shipping a vulnerable version of fam
which allows unprivileged users to determine filenames of
group root.
New packages are available on our FTP servers.
- xpdf
An integer overflow in pdftops may lead to system compromise.
New packages are available on our FTP servers..
- libmcrypt
Several buffer overflows in libmcrypt were discovered by Ilia
Alshanetsky. The buffer overflows can lead to system compromise.
New packages are currently being build.
- gfxboot
Since SuSE 8.1 the bootloader lilo is replaced by grub.
Grub's password authentication can be bypassed.
New packages will be released soon.
- mod_php4
A buffer overflow in the wordwrap() function has been reported.
New packages will be prepared and should be available on our ftp
servers soon.
- wget
A buffer overflow in wget's url_filename function was found.
This buffer overflow can be triggered by long URLs.
New packages are currently being build and will be released
soon.
- IMP
The web front-end of IMP is vulnerable to a SQL injection attack.
New packages are currently being build and will be released
soon.
______________________________________________________________________________
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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Bye,
Thomas
--
Thomas Biege <thomas@suse.de>
SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg
Function: 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
--
Over thinking, Over analyzing, seperates the body from the mind.
- Maynard James Keenan
--
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: Mon Jan 20 2003 - 17:53:22 CET
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