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Home » Hacking News » SuSE Security Announcement: susehelp (SuSE-SA:2003:005)

SuSE Security Announcement: susehelp (SuSE-SA:2003:005)

by Nikola Strahija on January 23rd, 2003 Content of this advisory: 1) security vulnerability resolved: Remote command execution due to broken filtering of shell metacharacters in CGI queries. problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: mod_php4 3) standard appendix (further information)


Package: susehelp
Announcement-ID: SuSE-SA:2003:005
Date: Mon Jan 20 14:00:00 CET 2003
Affected products: SuSE Linux 8.1,
SuSE Linux Enterprise Server 8,
SuSE Linux Office Server,
SuSE Linux Openexchange Server 4
Vulnerability Type: remote command execution
Severity (1-10): 5
SuSE default package: no
Cross References: -

Content of this advisory:
1) security vulnerability resolved: Remote command execution due
to broken filtering of shell metacharacters in CGI queries.
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds: mod_php4
3) standard appendix (further information)

______________________________________________________________________________

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

During a code review of the susehelp package the SuSE Security Team
recognized that the security checks done by the susehelp CGI scripts are
insufficient.
Remote attackers can insert certain characters in CGI queries to the
susehelp system tricking it into executing arbitrary code as the "wwwrun"
user. Please note that this is only a vulnerability if you have a web server
running and configured to allow access to the susehelp system by remote
sites.
We nevertheless recommend an update of this package. As a temporary
workaround you may un-install the susehelp package by issuing the following
command as root:

rpm -e --nodeps susehelp


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.


SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/noarch/susehelp-2002.09.05-51.noarch.rpm
6dde3d487385fd6a935643b1a0d92b86
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/noarch/susehelp-SLOD-2002.09.05-2.noarch.rpm
cd91f786f056518a11192b1ce9597783

______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- mod_php4
A buffer overflow in the wordwrap() function has been reported.
New packages will be prepared and should be availble soon on our ftp
servers.

______________________________________________________________________________

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 [email protected]),
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 "[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.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:

[email protected]
- general/linux/SuSE security discussion.
All SuSE security announcements are sent to this list.
To subscribe, send an email to
.

[email protected]
- 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.


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