SUSE Linux Information for VU#333628

OpenSSH contains buffer management errors

Status

Affected

Vendor Statement

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

______________________________________________________________________________

SuSE Security Announcement

Package:                openssh (second release)
Announcement-ID:        SuSE-SA:2003:039
Date:                   Thursday, Sep 18 2003 20:00 MEST
Affected products:      7.2, 7.3, 8.0, 8.1, 8.2

SuSE Linux Database Server,
SuSE eMail Server III, 3.1
SuSE Linux Enterprise Server 7, 8
SuSE Linux Firewall on CD/Admin host
SuSE Linux Connectivity Server
SuSE Linux Office Server
SuSE Linux Standard Server 8

Vulnerability Type:     potential remote privilege escalation
Severity (1-10):        8
SuSE default package:   yes
Cross References:      
http://www.openssh.com/txt/buffer.adv
CERTVU#333628 http://www.kb.cert.org/vuls/id/333628
CVE CAN-2003-0693
CVE CAN-2003-0695
CVE CAN-2003-0682



Content of this advisory:
1) security vulnerability resolved: openssh

problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:

- mysql
3) standard appendix (further information)


______________________________________________________________________________

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

The openssh package is the most widely used implementation of the secure
shell protocol family (ssh). It provides a set of network connectivity
tools for remote (shell) login, designed to substitute the traditional
BSD-style r-protocols (rsh, rlogin). openssh has various authentification
mechanisms and many other features such as TCP connection and X11 display
forwarding over the fully encrypted network connection as well as file
transfer facilities.


This is a new release of SuSE Security Announcement (openssh),
ID SuSE-SA:2003:038. A set of new bugs were addressed by the openssh
development team. These bugs are fixed in the new 3.7.1 upstream release
of the openssh package; we have added the necessary changes to our
packages preserving the package version to avoid the risk of incompatible
behaviour of the software.


Specifics about the errors found:
(Topic for SuSE Security Announcement SuSE-SA:2003:038:)
A programming error has been found in code responsible for buffer
management. If exploited by a (remote) attacker, the error may lead to
unauthorized access to the system, allowing the execution of arbitrary
commands. The error is known as the buffer_append_space()-bug and is
assigned the Common Vulnerabilities and Exposures (CVE) name CAN-2003-0693.
The error was cause for the upstream release openssh-3.7.


(Topic for SuSE Security Announcement SuSE-SA:2003:039 (this announcement):)
Programming errors of a similar kind as described above have been found in
other portions of the code, with similar effects. These errors are known
as "buffer.c/channels.c bug", the CVE name for these errors is CAN-2003-0695.
This set of errors was cause for the upstream release openssh-3.7.1.
In addition to the fixes for the buffer.c/channels.c bugs we have added
some changes that have been assembled by Solar Designer during his review
of the source code. These fixes are considered a precautious measure and
are not believed to have a significant effect on the security of the
openssh code.


At the time of writing this announcement, we believe that at least one set
of errors as described above is exploitable by a remote attacker. As a
reminder,  at the time of writing the SuSE Security Announcement
SuSE-SA:2003:038 it was unclear if the bug addressed with the announcement
(buffer_append_space()-bug) is exploitable. An increasing amount of TCP
connection attempts to port 22 as observed in the internet during the
past days may indicate that there exists an exploit for the error in the
public.


Please note that we have disabled the Privilege Separation feature in
the ssh daemon (sshd) with this update. The PrivSep feature is designed
to have parts of the ssh daemon's work running under lowered privileges,
thereby limiting the effect of a possible vulnerability in the code. The
PrivSep feature is turned on/off by the UsePrivilegeSeparation keyword
in sshd's configuration file /etc/ssh/sshd_config. The feature is held
responsible for malfunctions in PAM (Pluggable Authentification Modules).
The update mechanism will not overwrite configuration files that have
been altered after the package installation.




SPECIAL INSTALL INSTRUCTIONS:
==============================
After the update has been successfully applied, the ssh daemon (sshd)
must be restarted for update package to become effective. To restart the
ssh daemon after the update, please run the following command as root:


rcsshd 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-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/openssh-3.5p1-107.i586.rpm
e030b0803481d0f29f576e3b4726284f
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/openssh-3.5p1-107.i586.patch.rpm
d022894363b99e6bd03e9b2109c2244c
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/openssh-3.5p1-107.src.rpm
3f7f5ed43c7d795c63fe06148874944a

SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssh-3.4p1-215.i586.rpm
91cdd33a4149756b8f6371aa3177a5f4
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssh-3.4p1-215.i586.patch.rpm
3b7c44819c8fed5e33514481d99d4ab7
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/openssh-3.4p1-215.src.rpm
6c3694fc75bcf185035547b85abbc491

SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-215.i386.rpm
c61781b97767188cc3a39795535307ff
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-215.i386.patch.rpm
c222aef79a8fef6d44d8d61fc075efc5
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/openssh-3.4p1-215.src.rpm
bc327a4150058c9d1216cb96712973a5

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/openssh-2.9.9p2-156.i386.rpm
c9928c04b03cb292aa96ad6890a5ee38
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/openssh-2.9.9p2-156.src.rpm
28aa82be9233e3ba93b94eb138c9ea04

SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/openssh-2.9.9p2-156.i386.rpm
b369724a788a2c6bd70a448a49530f69
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/openssh-2.9.9p2-156.src.rpm
98b8b7281fe04aab8c8838adcf195697




Sparc Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec1/openssh-2.9.9p2-53.sparc.rpm
97cb0218e9354b8cc062e44a0d6fb19f
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/openssh-2.9.9p2-53.src.rpm
8cddb96e633864469d7ba08d3cf7436a



PPC Power PC Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec1/openssh-2.9.9p2-109.ppc.rpm
37b1e82a3971f5c4c427ce37227b11e0
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/openssh-2.9.9p2-109.src.rpm
7a19424887772b86d14bacbf5add9628


______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

- A buffer overflow vulnerability has been found in the mysql package,
an Open Source relational database system. The error may allow a remote
attacker to execute arbitrary code with the privileges of the database
process.
We are in the process of building and testing the update packages and
will release them with a SuSE Security Announcement as soon as possible.


______________________________________________________________________________

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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=LRKC
- -----END PGP PUBLIC KEY BLOCK-----

Roman Drahtmüller,
SuSE Security.
- --

-                                                                      -
| Roman Drahtmüller      <draht@suse.de> // "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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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.