Date: Fri, 3 Aug 2001 19:33:59 +0200 (CEST)
From: Thomas Biege <thomas@suse.de>
To: bugtraq@securityfocus.com
Subject: SuSE Security Announcement: xmcd (SuSE-SA:2001:025)
-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: xmcd
Announcement-ID: SuSE-SA:2001:025
Date: Friday, Aug 3rd 2001 18:30 MEST
Affected SuSE versions: (6.0, 6.1, 6.2,) 6.3, 6.4, 7.0, 7.1, 7.2
Vulnerability Type: local privilege escalation
Severity (1-10): 4
SuSE default package: no
Other affected systems: yes
Content of this advisory:
1) security vulnerability resolved: yes
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
Cda, a setuid commandline part of xmcd, a X11/Motif audio CD player by
Ti Kan <ti@amb.org>, was found vulnerable by a link attack and some
bufferoverflows.
These bugs could be exploited by an adversary, who has access to the
system, to overwrite files or gain higher privileges.
As a temporary fix, just remove the setuid bit from cda:
/bin/chmod 755 /usr/X11R6/bin/cda
or let just trusted users execute cda:
/bin/chown root.trusted /usr/X11R6/bin/cda
/bin/chmod 4750 /usr/X11R6/bin/cda
Don't forget to add these changes to your /etc/permissions.local file
Users of SuSE 7.2 with permissions.secure or permissions.paranoid
activated are safe, because setuid is already removed.
Thanks to Paul Starzetz <paul@starzetz.de>, who reportes the link attack
and to Ti Kan <ti@amb.org>, the author of xmcd, for his fast response
and help.
New RPMs can be found at the following places.
i386 Intel Platform:
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/snd2/xmcd-2.6-195.i386.rpm
2e11b84704ab44c61b04f2e9bfde1371
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/xmcd-2.6-195.src.rpm
2d934ab9662d3aee69041d2118ead682
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/snd2/xmcd-3.0.2-2.i386.rpm
dbeb8ddbf8e435d54930d1acef85cfe6
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/xmcd-3.0.2-2.src.rpm
38c24dc21572cfefc3f678bb534457e7
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/snd2/xmcd-3.0.2-2.i386.rpm
55ef501823f33033d6e649a6df872cf7
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/xmcd-3.0.2-2.src.rpm
6ba4db1799355aef6fe5202164338b5d
SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/snd2/xmcd-3.0.2-2.i386.rpm
8f0dd51c4ed7b9dabd554793a98504f3
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/xmcd-3.0.2-2.src.rpm
076151818b5054d40d955bdf060f601b
SuSE-6.3
ftp://ftp.suse.com/pub/suse/i386/update/6.3/snd2/xmcd-3.0.2-2.i386.rpm
a53b36543b555ad435eebede89324227
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/xmcd-3.0.2-2.src.rpm
4274da4334b67a04d10f2ade67305679
Sparc Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/snd2/xmcd-3.0.2-0.sparc.rpm
b6fb5c9a71c578866fcefd978c3dd469
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/xmcd-3.0.2-0.src.rpm
0c6a783486669cc57b35575edabfd6b4
SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/snd2/xmcd-3.0.2-0.sparc.rpm
b7ae66325a2875e97d28ec7b0152dc35
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/xmcd-3.0.2-0.src.rpm
836be977435960908c77d753c47084fb
AXP Alpha Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/snd2/xmcd-3.0.2-2.alpha.rpm
b2c1652b694655fbd5635b455355fe59
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/xmcd-3.0.2-2.src.rpm
78af000c592f274fa78019da47463c2f
SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/snd2/xmcd-3.0.2-3.alpha.rpm
67a11e69a66ee0e5c36f8bd4c67d1e49
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/xmcd-3.0.2-3.src.rpm
17fa48bdd3b20c263c09578391a6da2e
SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/snd2/xmcd-3.0.2-4.alpha.rpm
c0ee2188da89b7756e143495b2947a41
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/xmcd-3.0.2-4.src.rpm
39acbbe4d54c671f925b342091f4b994
SuSE-6.3
ftp://ftp.suse.com/pub/suse/axp/update/6.3/snd2/xmcd-3.0.2-4.alpha.rpm
5480828717020d146da0d9413ab8fab8
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/xmcd-3.0.2-4.src.rpm
5a5d4af61d0b4ce629ad19a06d8dcd2b
PPC PowerPC Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/snd2/xmcd-3.0.2-3.ppc.rpm
3292bb4e6410aa1d5268fca8540024af
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/xmcd-3.0.2-3.src.rpm
f6ddf546fa6562ac02d7b56fde58ea11
SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/snd2/xmcd-3.0.2-3.ppc.rpm
4bd49ef46dbf59a9155af6322a4a34c3
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/xmcd-3.0.2-3.src.rpm
67762f89ddeec6eb4a99a5919ad35927
SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/snd2/xmcd-3.0.2-3.ppc.rpm
295884a4eb13da364b6a8f0b3ae2f69d
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/xmcd-3.0.2-3.src.rpm
185fd215007d17348e11982bbc2c2ad1
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- openssl
Currently we check are checking the dependencies of openssl to other
dynamic or static linked applications on SuSE Linux. An announcement
will be released soon.
- dqs
dex@raza-mexicana.org has found an exploitable buffer overflow bug in
the dsh program from the dqs package on SuSE Linux distributions.
To workaround the problem, do "chmod -s /usr/bin/dsh" and change the
files /etc/permissions* to reflect the change. If you do not need the
dqs package, then deinstall it (rpm -e dqs).
Packages for most of the supported SuSE Linux distributions are
available at the usual location ftp://ftp.suse.com/pub/suse/<;arch>/<dist>
for download and installation/update. Do not forget to change the files
/etc/permissions* to remove the suid-bit from the dsh program. Please
note that we will not issue a dedicated security announcement for this
specific bug.
- pcp
Paul Starzetz discovered a security weakness in the setuid root program
/usr/share/pcp/bin/pmpost. The common library in pcp trusts the
environment that has been supplied by the user, regardless of privileged
execution or not. By consequence, a user can specify the configuration
file and therefore write to files owned by root. The problem is not based
on insecurely following symlinks as stated by Paul Starzetz.
The pcp package is not installed by default in SuSE Linux distributions.
We have provided update packages for the SuSE Linux distributions version
7.1 and 7.2 that remove the setuid bit from the pmpost binary. Versions
before SuSE-7.1 were not affected because the setuid bit was not set.
We thank Keith Owens and Mark Goodwin from Silicon Graphics for responding
quickly and for publishing a new version of the pcp package which will
be included in future releases of the SuSE Linux distribution. For more
information see the /usr/share/doc/packages/pcp directory of your SuSE
Linux installation after installing the update package, or go to
obtained from http://oss.sgi.com/projects/pcp/download .
Please note that there will not be a dedicated security announcement
for this specific bug.
- fetchmail (fetchml)
New fetchmail packages are available on the ftp server. The packages
cure a buffer overflow that can be exploited by sending a victim a
specially designed email, waiting for the victim's fetchmail program
to pick up the email. We are preparing a security announcement for this
problem.
- openssh
update packages for the openssh package after (and including) SuSE-6.4
are available on our ftp servers ftp.suse.de (for < 7.1) or
ftp.suse.com (for >= 7.1). We are currently checking for a non-security
related irregularity in sshd's behaviour under faulty setup conditions.
- exim
SuSE Linux distributions do not contain the exim Mail Transport Agent
(See http://www.exim.org/ for details) and are therefore not susceptible
to the recently found security-related bugs.
- webmin
SuSE Linux distributions do not contain the webmin administration
web frontend (See http://www.webmin.org/ for details) and are therefore
not vulnerable to the recently found security-related problems in the
software.
______________________________________________________________________________
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 uninstalled 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 toplevel 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 annoucements 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>.
The <security@suse.com> 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 cleartext signature shows proof of the
authenticity of the text.
SuSE GmbH 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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Bye,
Thomas
--
Thomas Biege, SuSE GmbH, Schanzaeckerstr. 10, 90443 Nuernberg
E@mail: thomas@suse.de Function: Security Support & Auditing
"lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka"
Key fingerprint = 51 AD B9 C7 34 FC F2 54 01 4A 1C D4 66 64 09 84
