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Postfix is a flexible MTA replacement for sendmail. Michal Zalewski has reported problems in postfix which can lead to a remote DoS attack or allow attackers to bounce-scan private networks. These problems have been fixed. Even though not all of our products are vulnerable in their default configurations, the updates should be applied.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: postfix
Announcement-ID: SuSE-SA:2003:033
Date: Mon Aug 4 13:30:00 MEST 2003
Affected products: 7.2, 7.3, 8.0, 8.1
SuSE Linux Database Server
SuSE eMail Server III, 3.1
SuSE Linux Enterprise Server 7, 8
SuSE Linux Connectivity Server
SuSE Linux Office Server
SuSE Linux Openexchange Server
UnitedLinux 1.0
SuSE Linux Desktop 1.0
Vulnerability Type: remote Denial of Service (DoS) attack
Severity (1-10): 4
SuSE default package: Since SuSE Linux 8.1.
Cross References: CAN-2003-0468
CAN-2003-0540
Content of this advisory:
1) security vulnerability resolved: remote DoS in postfix
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- kernel
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
Postfix is a flexible MTA replacement for sendmail.
Michal Zalewski has reported problems in postfix which can lead to
a remote DoS attack or allow attackers to bounce-scan private networks.
These problems have been fixed. Even though not all of our products are
vulnerable in their default configurations, the updates should be applied.
In order for the update to take effect, you have to restart your MTA
by issuing the following command as root:
"/sbin/rcpostfix 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.
i386 Intel Platform:
SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/postfix-1.1.12-12.i586.rpm
4b3b65905911440051f869b3e95c2c66
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/postfix-1.1.12-12.i586.patch.rpm
e73917624b5adfdbe113909135a50a42
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/postfix-1.1.12-12.src.rpm
0e5bcc6c3cd95f09c423cf00aac0c303
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/postfix-1.1.12-13.i386.rpm
e0090e0ed051a532a62d787b020ac580
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/postfix-1.1.12-13.i386.patch.rpm
8c156ca92ad4be83588041192efe5b60
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/postfix-1.1.12-13.src.rpm
f9389f00de109cea2f0b3b6c27f5a515
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/postfix-20010228pl08-22.i386.rpm
1f4d3af8d10850096bc0260567caa334
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/postfix-20010228pl08-22.src.rpm
0ccc29a957609b3aeb2c12f3cc85284d
SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/postfix-20010228pl03-82.i386.rpm
444f983a8c8f0d18621a1e8b4c3dd260
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/postfix-20010228pl03-82.src.rpm
6d479bd0ed90bc7dc59a4201327ffc05
Sparc Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/postfix-20010228pl08-15.sparc.rpm
83eb074dbcedae2c9947006b4c0411d2
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/postfix-20010228pl08-15.src.rpm
ec7ae58e31fd2ec63ccd881454372307
PPC Power PC Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/postfix-20010228pl08-36.ppc.rpm
f7b331c15b7bf705274afe2665e9e187
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/postfix-20010228pl08-36.src.rpm
f2e5aa58e24599777a95dce715c3bcad
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- kernel
Various bugs inside the kernel have been reported recently. The most
important ones are
- NFSv3 remote DoS
- netfilter DoS
- /proc infoleak
- race condition in the ELF loader
These bugs are fixed. The new kernel packages will be approved as soon as
the testing is finished.
______________________________________________________________________________
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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--
~
~ perl self.pl
~ $_='print"$_=47$_47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
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: Mon Aug 04 2003 - 14:23:31 CEST
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