Author: JT Smith
SuSE A.G.: The susehelp package contains several CGI-scripts to provide a flexible help-system to the user. Some of these scripts open files in an insecure manner, thus allowing remote attackers to execute arbitrary commands as wwwrun-user on the server running susehelp package. These bugs have been fixed in the newly available packages. Please update your susehelp package immediately if present on your system.
______________________________________________________________________________
SuSE Security Announcement
Package: susehelp
Announcement-ID: SuSE-SA:2001:041
Date: Thu Nov 22 11:36:00 MET 2001
Affected SuSE versions: 7.2, 7.3
Vulnerability Type: remote command execution
Severity (1-10): 8
SuSE default package: yes
Other affected systems: no
Content of this advisory:
1) security vulnerability resolved: CGI vulnerability in susehelp.
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 susehelp package contains several CGI-scripts to provide a flexible
help-system to the user. Some of these scripts open files in an insecure
manner, thus allowing remote attackers to execute arbitrary commands
as wwwrun-user on the server running susehelp package. These bugs have been
fixed in the newly available packages. Please update your susehelp package
immediately if present on your system.
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/doc1/susehelp-2001.09.06-110.noarch.rpm
8b441a44bda65f5e162d326d1e6ed1df
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/susehelp-2001.09.06-110.src.rpm
9e38fa3bbc650974c8138981754610b6
SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/doc1/susehelp-2001.05.14-41.noarch.rpm
27789618aeb317225c8262016afb65b9
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/susehelp-2001.05.14-41.src.rpm
fd5a85ebada13eb6de95067b066746c0
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- The ziptool program runs setuid root in the easy permission mode and
contains an overflow which allows local attackers to gain root
privileges. A zipdrive must be configured and a zipdisk being inserted
in order to exploit the bug. The overflow has been fixed. Please update
your packages.
- The ncpfs package containing the setuid root programs ncpmount and
ncpumount was vulnerable to local bufferoverflow attacks. The package
has been fixed.
______________________________________________________________________________
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 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 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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