Date: Thu, 18 Sep 2003 20:24:56 +0200 (MEST)
From: Roman Drahtmueller <[email protected]>
To: [email protected]Subject: SuSE Security Announcement: openssh (second release) (SuSE-SA:2003:039)
-----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/i=
d/333628=20
CVE CAN-2003-0693
CVE CAN-2003-0695
CVE CAN-2003-0682
=09=09=09=09
Content of this advisory:
1) security vulnerability resolved: openssh
problem description, discussion, solution and upgrade informatio=
n
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 secur=
e
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 authentificati=
on
mechanisms and many other features such as TCP connection and X11 displ=
ay
forwarding over the fully encrypted network connection as well as file
transfer facilities.
This is a new release of SuSE Security Announcement (openssh),=20
ID SuSE-SA:2003:038. A set of new bugs were addressed by the openssh=20
development team. These bugs are fixed in the new 3.7.1 upstream releas=
e=20
of the openssh package; we have added the necessary changes to our=20
packages preserving the package version to avoid the risk of incompatib=
le=20
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=20
assigned the Common Vulnerabilities and Exposures (CVE) name CAN-2003-0=
693.
The error was cause for the upstream release openssh-3.7.
(Topic for SuSE Security Announcement SuSE-SA:2003:039 (this announceme=
nt):)
Programming errors of a similar kind as described above have been found=
in=20
other portions of the code, with similar effects. These errors are know=
n=20
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=
=20
some changes that have been assembled by Solar Designer during his revi=
ew=20
of the source code. These fixes are considered a precautious measure an=
d=20
are not believed to have a significant effect on the security of the=20
openssh code.
At the time of writing this announcement, we believe that at least one =
set=20
of errors as described above is exploitable by a remote attacker. As a=
=20
reminder, at the time of writing the SuSE Security Announcement=20
SuSE-SA:2003:038 it was unclear if the bug addressed with the announcem=
ent
(buffer_append_space()-bug) is exploitable. An increasing amount of TCP=
=20
connection attempts to port 22 as observed in the internet during the=
=20
past days may indicate that there exists an exploit for the error in th=
e=20
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. Th=
e
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:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D
After the update has been successfully applied, the ssh daemon (sshd)
must be restarted for update package to become effective. To restart th=
e
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 appl=
y
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.s=
rc.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.s=
rc.rpm
6c3694fc75bcf185035547b85abbc491
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-215.i386=
=2Erpm
c61781b97767188cc3a39795535307ff
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-215.i386=
=2Epatch.rpm
c222aef79a8fef6d44d8d61fc075efc5
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/openssh-3.4p1-215.src.r=
pm
bc327a4150058c9d1216cb96712973a5
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/openssh-2.9.9p2-156.i3=
86.rpm
c9928c04b03cb292aa96ad6890a5ee38
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/openssh-2.9.9p2-156.src=
=2Erpm
28aa82be9233e3ba93b94eb138c9ea04
SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/openssh-2.9.9p2-156.i3=
86.rpm
b369724a788a2c6bd70a448a49530f69
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/openssh-2.9.9p2-156.src=
=2Erpm
98b8b7281fe04aab8c8838adcf195697
Sparc Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec1/openssh-2.9.9p2-53.sp=
arc.rpm
97cb0218e9354b8cc062e44a0d6fb19f
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/openssh-2.9.9p2-53.src=
=2Erpm
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=
=2Erpm
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=
=2E
___________________________________________________________________________=
___
3) standard appendix: authenticity verification, additional information
- Package authenticity verification:
SuSE update packages are available on many mirror ftp servers all over=
=20
the world. While this service is being considered valuable and importan=
t
to the free and open source software community, many users wish to be=
=20
sure about the origin of the package and its content before installing
the package. There are two verification methods that can be used=20
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=20
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 th=
e
announcement. Since the announcement containing the checksums is=20
cryptographically signed (usually using the key [email protected]),=
=20
the checksums show proof of the authenticity of the package.
We disrecommend to subscribe to security lists which cause the=20
email message containing the announcement to be modified so that
the signature does not match after transport through the mailing=20
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=
=20
md5 sums for the files are useless.
2) rpm package signatures provide an easy way to verify the authenticit=
y
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,=20
package authenticity verification can only target an un-installed rp=
m
package file.
Prerequisites:
a) gpg is installed
b) The package is signed using a certain key. The public part of th=
is
key must be installed by the gpg program in the directory=20
~/.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 "[email protected]" 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.gp=
g)
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:
[email protected]
- general/linux/SuSE security discussion.=20
All SuSE security announcements are sent to this list.
To subscribe, send an email to=20
<[email protected]>.
[email protected]
- SuSE's announce-only mailing list.
Only SuSE's security announcements are sent to this list.
To subscribe, send an email to
<[email protected]>.
For general information or the frequently asked questions (faq)=20
send mail to:
<[email protected]> or
<[email protected]> respectively.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
SuSE's security contact is <[email protected]> or <[email protected]>.
The <[email protected]> public key is listed below.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
___________________________________________________________________________=
___
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 <[email protected]>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <[email protected]>
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=3DLRKC
- -----END PGP PUBLIC KEY BLOCK-----
Roman Drahtm=FCller,
SuSE Security.
- --=20
- -
| Roman Drahtm=FCller <[email protected]> // "You don't need eyes to see, =
|
SuSE Linux AG - Security Phone: // you need vision!"
| N=FCrnberg, Germany +49-911-740530 // Maxi Jazz, Faithless =
|
- -
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