...

SuSE Linux Office Server Vulnerability Type: local privilege escalation Severity (1-10): 7 SuSE default package: yes (until SuSE Linux 8.0 and SLES7) Cross References:

Thanks for the incredibly fast turnaround!

and quite wrong. I'll probably not send it around any more here in suse-security@suse.com, but the announce list will see a second announcement later tonight: The Vulnerability Type is not "local privilege escalation". It must read "remote privilege escalation". Looks like I was too hasty when I wrote it - we had to finish testing in time.

Very much appreciated!!!

Regards, MMD

Regards, Roman-

John Andersen writes:

If there is no known workaroud other than using a DIFFERENT MTA then why is the recommended solution to install an upgrade of the SAME MTA...

Because the upgrade is not a workaround but is a fix for the problem?

On Tue, Mar 04, 2003 at 10:35:26AM +0100, Sebastian Stadtlich wrote:

what i did was : rpm -U sendmail-tls-8.11.3-110.i386.rpm

is my sendmail safe now?

As stated in the advisory, you need to restart the daemon. Otherwise you'll continue to run the old server. Olaf -- Olaf Kirch | Anyone who has had to work with X.509 has probably okir@suse.de | experienced what can best be described as ---------------+ ISO water torture. -- Peter Gutmann

Sebastian Stadtlich wrote:

Hi

I did :

rcsendmail stop rcsendmail start

still the header is the same as before...

sorry. i forgot to write that in the first mail :-(

As SuSE only patches the current running version on each distro you have to take a look into the changelog: rpm -q sendmail --changelog there should be something that informs you about the patch. Otherwise check the installed version: rpm -q sendmail if it's the announced version for your SuSE distro (like sendmail-8.12.6-91 for 8.1) you're safe now (as long as someonw who runs sendmail can be safe ;) Regards, Sven

Maarten J H van den Berg writes:

It seems to me that at least a part of the fix is inside the sendmail.cf config file ? Since these files are never touched while upgrading but instead just saved as , wouldn't you just stay vulnerable until you manually merge the difference between those files ??

By default on SuSE systems, sendmail.cf is dynamically created by SuSEconfig.sendmail. So run SuSEconfig --module sendmail as part of the upgrade. If you do not let SuSEconfig generate sendmail.cf then you can regenerate it yourself by re-running the m4 processor (does anyone still generate sendmail.cf "by hand" without using m4?)

It seems that there is another problem with suse 8.0 and the sendmail patch. now I got messages like MDeferred: Connection refused by localhost.somedomain.com. in my /var/spool/clientmqueue. I didn't change anything but applying the patch. the domain localhost.somedomain.com is not valid and known neither to /etc/hosts nor to DNS. before the patch everything worked fine. after some investigation I found out that in my /etc/resolv.conf I had an entry whith "search somedomain.com" instead of "domain somedomain.com" lg Christoph

-----Ursprüngliche Nachricht----- Von: Christoph Illnar [mailto:illnar@globalace.net] Gesendet: Dienstag, 04. März 2003 20:36 An: suse-security@suse.com Cc: Roman Drahtmueller Betreff: AW: [suse-security] SuSE Security Announcement: sendmail (SuSE-SA:2003:013)

Hi folks,

after applying the provided patch for sendmail (suse 8.0) , my bulk_mailer didn't work any more. I got the error 500 5.5.1 Command unrecognized: "ONEX"

the changelog for sendmail 8.12.0/8.12.0 tells us: The SMTP server no longer forks on each MAIL command. The ONEX command has been removed.

This is a very old version, so I was a little bit curious why bulk_mailer was using that command while no error was raised.

Anyway I had to patch my version of bulk_mailer to get that functionality back!

lg Christoph Illnar

...

-----Ursprüngliche Nachricht----- Von: Roman Drahtmueller [mailto:draht@suse.de] Gesendet: Montag, 03. März 2003 20:20 An: suse-security@suse.com Betreff: [suse-security] SuSE Security Announcement: sendmail (SuSE-SA:2003:013)

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

__________________________________________________________________ ____________

SuSE Security Announcement

Package: sendmail, sendmail-tls Announcement-ID: SuSE-SA:2003:013 Date: Monday, March 3rd 2003, 18:10 MET Affected products: 7.1, 7.2, 7.3, 8.0, 8.1 SuSE Linux Database Server, SuSE Linux Enterprise Server 7, 8 SuSE Linux Firewall on CD/Admin host SuSE Linux Connectivity Server SuSE Linux Office Server Vulnerability Type: local privilege escalation Severity (1-10): 7 SuSE default package: yes (until SuSE Linux 8.0 and SLES7) Cross References: http://www.cert.org/advisories/CA-2003-07.html

Content of this advisory: 1) security vulnerability resolved: sendmail problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - vnc - w3m 3) standard appendix (further information)

__________________________________________________________________ ____________

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

sendmail is the most widely used mail transport agent (MTA) in the internet. A remotely exploitable buffer overflow has been found in all versions of sendmail that come with SuSE products. These versions include sendmail-8.11 and sendmail-8.12 releases. sendmail is the MTA subsystem that is installed by default on all SuSE products up to and including SuSE Linux 8.0 and the SuSE Linux Enterprise Server 7.

The vulnerability is triggered by an email message sent through the sendmail MTA subsystem. In that respect, it is different from commonly known bugs that occur in the context of an open TCP connection. By consequence, the vulnerability also exists if email messages get forwarded over a relay that itself does not run a vulnerable MTA. This specific detail and the wide distribution of sendmail in the internet causes this vulnerability to be considered an error of major severity.

The buffer overflow happens on the heap and is known to be exploitable. As of the writing of this announcement, there is no exploit known to exist in the public. Since there is no known workaround for this vulnerability other than using a different MTA, it is strongly recommended to install the update packages as offered at the locations as listed below.

We would like to express our gratitude to Eric Allman for notifying SuSE Security of the problem. The vulnerability was discovered by ISS Internet Security Systems, inc.

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.

SPECIAL INSTALL INSTRUCTIONS: ============================== After performing the update, it is necessary to restart all running instances of sendmail using the command "rcsendmail restart" as root.

Intel i386 Platform:

SuSE-8.1:

ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12 .6-91.i586.rpm 0f3d981ad8e9be64bc70aff474ce303c

ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-deve l-8.12.6-91.i586.rpm afe98a29de75ecd362fad5b02a922856 patch rpm(s):

ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12 .6-91.i586.patch.rpm ebd8f188748812aff2830b23de6f34b3

ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-deve l-8.12.6-91.i586.patch.rpm 09ff6834c369051d165d78f01a44d684 source rpm(s):

ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sendmail-8.12. 6-91.src.rpm 50e471df3a90ce4b54b2c5ca3fbc081e

SuSE-8.0:

ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-72.i386.rpm

...

09e0a8ed5b189c7c819d3d38f74a07e1

ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/sendmail-devel-8.12 .3-72.i386.rpm 72a8c31090299df6b7bd52ea38c31c2b patch rpm(s):

ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-72. i386.patch.rpm 905b39525ecd0506892b442a204b7aa3

ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/sendmail-devel-8.12 .3-72.i386.patch.rpm a03e4a221c1fb8f2387dc133ada9e604 source rpm(s):

ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sendmail-8.12.3-72.src.rpm

...

6e3106de72c4605d379dc2133adba97b

SuSE-7.3:

ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/sendmail-8.11.6-162 .i386.rpm 9d04ffb6a8d6f1fe6e2efe217de69ad7

ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec2/sendmail-tls-8.11 .6-164.i386.rpm ebf8d1b2ef233a68b0326e6ce6974994 source rpm(s):

ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sendmail-8.11.6-16 2.src.rpm aebf9a30089a13717928e9ba5309a6ed

ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sendmail-tls-8.11. 6-164.src.rpm 371e39b10ee7d4c255e96e935c473aa8

SuSE-7.2:

ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/sendmail-8.11.3-106 .i386.rpm dbff6db47875bc00a95409cba9498c49

ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/sendmail-tls-8.11 .3-110.i386.rpm 7c7af39c8179219f6302707ab67bacea source rpm(s):

ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sendmail-8.11.3-10 6.src.rpm 85ff9f88013f6f0b23ed8fb15704bc82

ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sendmail-tls-8.11. 3-110.src.rpm 7502589ff50b89f86398571c5686c23c

SuSE-7.1:

ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/sendmail-8.11.2-44.i386.rpm

...

701f6c5d9748e0b9cd5606cdaaa84cd8

ftp://ftp.suse.com/pub/suse/i386/update/7.1/sec2/sendmail-tls-8.11 .2-45.i386.rpm 1583015b284c5166c9bd862c3e24bf14 source rpm(s):

ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sendmail-8.11.2-44.src.rpm

...

b51e8383dc11ca9be65e05ee4209f740

ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sendmail-tls-8.11. 2-45.src.rpm 3de4e382d512f6175cc5050d393d76a0

Sparc Platform:

SuSE-7.3:

ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/sendmail-8.11.6-63 .sparc.rpm 0f70b263b09c319dcf698786b14de86f

ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec2/sendmail-tls-8.1 1.6-63.sparc.rpm e7a3f0c6fadcbaedc9736c2a7a08aa5f source rpm(s):

ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sendmail-8.11.6-6 3.src.rpm 1a455df96d094008fcd7bc96f49ab938

ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sendmail-tls-8.11 .6-63.src.rpm 20d1fdca82189f4492a1dd28ba0d7e92

AXP Alpha Platform:

SuSE-7.1:

ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/sendmail-8.11.2-30.alpha.rpm

...

dfdd75f7e970002742135a5f48c9be71

ftp://ftp.suse.com/pub/suse/axp/update/7.1/sec2/sendmail-tls-8.11. 2-37.alpha.rpm ff6d0889f04eff5564c9e498954f9a85 source rpm(s):

ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sendmail-8.11.2-30.src.rpm

...

92bd9eee0d1b9eac76f4835f4f20dfe2

ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sendmail-tls-8.11.2 -37.src.rpm a5e9e67a860bfd6b873cb9d95134405b

PPC Power PC Platform:

SuSE-7.3:

ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/sendmail-8.11.6-120.ppc.rpm

...

ef7b092c43dddc3fcdfa45946df42232

ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec2/sendmail-tls-8.11. 6-119.ppc.rpm 927355dfa069ad1f032a1036ad65fb2c source rpm(s):

ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sendmail-8.11.6-120.src.rpm

...

35c672698ccaa213c6e42b2888ac24ad

ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sendmail-tls-8.11.6 -119.src.rpm c1ff2ba2174ed85c47fad4149e82e564

SuSE-7.1:

ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/sendmail-8.11.2-33.ppc.rpm d703b68846212626fdf1e1d3e15c733f

ftp://ftp.suse.com/pub/suse/ppc/update/7.1/sec2/sendmail-tls-8.11. 2-36.ppc.rpm d98905aaa881fec5684f32ff1d4927de source rpm(s):

ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sendmail-8.11.2-33.src.rpm

...

b582465c56651e15153ad5a0239cea6a

ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sendmail-tls-8.11.2 -36.src.rpm f1ef3e9c0f346cf4e7c4f9f70b049878

__________________________________________________________________ ____________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- vnc VNC (Virtual Network Computing) uses a weak cookie

generation process

...

which can be exploited by an attacker to bypass authentication. New packages are currently being tested and will be available on our FTP servers soon.

- w3m The textbased web-browser w3m does not properly escape HTML tags. A malicious HTML page or img alt attribute may lead to information leakage. New packages will be available 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 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 to verify the signature of the package, where 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-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 .

For general information or the frequently asked questions (faq) send mail to: or respectively.

=====================================================================

...

SuSE's security contact is or

.

...

The 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 pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key

- -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org

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| Roman Drahtmüller // "You don't need eyes to see, | SuSE Linux AG - Security Phone: // you need vision!" | Nürnberg, Germany +49-911-740530 // Maxi Jazz, Faithless | - -

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-- Check the headers for your unsubscription address For additional commands, e-mail: suse-security-help@suse.com Security-related bug reports go to security@suse.de, not here

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Hi Armin, thanks for your hint! of course I did not read that mail because it could not be delivered... ;-)))

-----Ursprüngliche Nachricht----- Von: Armin Schoech [mailto:schoech@iap-kborn.de] Gesendet: Dienstag, 04. März 2003 22:16 An: suse-security@suse.com Betreff: Re: AW: [suse-security] SuSE Security Announcement: sendmail (SuSE-SA:2003:013)

Hi Christoph,

...

It seems that there is another problem with suse 8.0 and the sendmail patch. now I got messages like

MDeferred: Connection refused by localhost.somedomain.com.

in my /var/spool/clientmqueue.

I didn't change anything but applying the patch. the domain localhost.somedomain.com is not valid and known neither to /etc/hosts nor to DNS.

--> Have you read the mails that root gets after this update ? One of them says that sendmail is now linked with libwrap. Therefore you need an entry in /etc/hosts.allow: sendmail: LOCAL

To allow local clients to connect to your sendmail server listening locally at port 25 (last part is from another of these mails to root). If your server is supposed to receive mail from remote hosts, you have to set SMTPD_LISTEN_REMOTE="yes" in /etc/sysconfig/mail

HTH, Armin

-- Am Hasenberg 26 office: Institut für Atmosphärenphysik D-18209 Bad Doberan Schloss-Straße 6 Tel. ++49-(0)38203/42137 D-18225 Kühlungsborn / GERMANY Email: schoech@iap-kborn.de Tel. +49-(0)38293-68-102 WWW: http://armins.cjb.net/ Fax. +49-(0)38293-68-50

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