83351 2002-11-05 17:37 /307 rader/ Sebastian Krahmer <krahmer@suse.de>
Importerad: 2002-11-05 17:37 av Brevbäraren
Extern mottagare: bugtraq@securityfocus.com
Mottagare: Bugtraq (import) <2223>
Ärende: SuSE Security Announcement: perl-MailTools (SuSE-SA:2002:041)
------------------------------------------------------------
-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: perl-MailTools
Announcement-ID: SuSE-SA:2002:041
Date: Tue Nov 5 11:30:00 CET 2002
Affected products: 7.1, 7.2, 7.3, 8.0, 8.1
SuSE eMail Server III, 3.1
Vulnerability Type: remote command execution
Severity (1-10): 6
SuSE default package: no
Cross References: -
Content of this advisory:
1) security vulnerability resolved: Remote command execution via
Mail::Mailer package.
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds: -
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade
information
The SuSE Security Team reviewed critical Perl modules, including the
Mail::Mailer package. This package contains a security hole which allows
remote attackers to execute arbitrary commands in certain circumstances.
This is due to the usage of mailx as default mailer which allows commands
to be embedded in the mail body.
Vulnerable to this attack are custom auto reply programs or spam filters
which use Mail::Mailer directly or indirectly.
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/perl-MailTools-1.47-29.i586.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/perl-MailTools-1.47-29.src.rpm
d41d8cd98f00b204e9800998ecf8427e
SuSE-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/perl3/perl-MailTools-1.42-120.i386.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/perl-MailTools-1.42-120.src.rpm
d41d8cd98f00b204e9800998ecf8427e
SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/perl2/perl-MailTools-1.1401-187.i386.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/perl-MailTools-1.1401-187.src.rpm
d41d8cd98f00b204e9800998ecf8427e
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/perl2/perl-MailTools-1.1401-187.i386.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/perl-MailTools-1.1401-187.src.rpm
d41d8cd98f00b204e9800998ecf8427e
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/perl2/perl-MailTools-1.1401-188.i386.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/perl-MailTools-1.1401-188.src.rpm
d41d8cd98f00b204e9800998ecf8427e
Sparc Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/perl2/perl-MailTools-1.1401-65.sparc.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/perl-MailTools-1.1401-65.src.rpm
d41d8cd98f00b204e9800998ecf8427e
AXP Alpha Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/perl2/perl-MailTools-1.1401-69.alpha.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/perl-MailTools-1.1401-69.src.rpm
d41d8cd98f00b204e9800998ecf8427e
PPC Power PC Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/perl2/perl-MailTools-1.1401-110.ppc.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/perl-MailTools-1.1401-110.src.rpm
d41d8cd98f00b204e9800998ecf8427e
SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/perl2/perl-MailTools-1.1401-111.ppc.rpm
d41d8cd98f00b204e9800998ecf8427e
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/perl-MailTools-1.1401-111.src.rpm
d41d8cd98f00b204e9800998ecf8427e
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
There is no additional information this time.
______________________________________________________________________________
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
~
(83351) /Sebastian Krahmer <krahmer@suse.de>/(Ombruten)
84032 2002-11-12 06:31 /67 rader/ Sebastian Krahmer <krahmer@suse.de>
Importerad: 2002-11-12 06:31 av Brevbäraren
Extern mottagare: Florian Weimer <Weimer@CERT.Uni-Stuttgart.DE>
Mottagare: Bugtraq (import) <2351>
Ärende: Re: SuSE Security Announcement: perl-MailTools (SuSE-SA:2002:041)
------------------------------------------------------------
On Fri, 8 Nov 2002, Florian Weimer wrote:
Hi,
> Sebastian Krahmer <krahmer@suse.de> writes:
>
> > The SuSE Security Team reviewed critical Perl modules, including
> > the Mail::Mailer package. This package contains a security hole
> > which allows remote attackers to execute arbitrary commands in
> > certain circumstances. This is due to the usage of mailx as
> > default mailer which allows commands to be embedded in the mail
> > body.
>
> The well-known case of command execution through mail bodies processed
> by mailx (~! SHELL-COMMAND) only affects certain mailx versions. Some
> vendors (including SuSE and Red Hat) base their packages on
> mailx-8.1.1 (probably a snapshot from the OpenBSD CVS from summer 1997
> or something like this), which behaves as documented in the manpage
> (no escape character processing unless stdin is a terminal), and are
> not affected.
This is only true when -I switch is not given. Unfortunally Mail::Mailer
adds -I to the commandline. So it does not need fd 0 to be a tty.
>
> The following change in OpenBSD (re)introduced the problem:
>
> http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/mail/collect.c.diff?r1=1.19&r2=1.20&f=u
>
> And this change corrects it again:
>
> http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/mail/collect.c.diff?r1=1.23&r2=1.24
>
> Only very few vendors based their package on one of the version
> between 1.20 and 1.23 (including). Debian once used one of the
> affected versions, but Debian GNU/Linux 3.0 (woody) includes the 1.24
> version and is safe.
>
> However, it's still a good idea to ditch /bin/mail, as provided by
> mailx:
>
> $ mail "| echo nice feature@localhost" < /dev/null
> No message, no subject; hope that's ok
> nice feature...@localhost
> $
Yes, this has been the second reason. I can point you to the full
analyzation
of the problems and exploit-mails which may trigger arbitrary
code execution if you want.
BTW, the maintainer of Mail::Mailer told me that using Mail::Mailer
is depricated anyways, one should rather use Mail::Box and its
friends, where recent mailx problem could also hit you and has been
fixed too. The manpage will point out clearly that 'mail' is not the
right type to send mail.
regards,
Sebastian
--
~
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
(84032) /Sebastian Krahmer <krahmer@suse.de>/(Ombruten)