Date: Tue, 18 Nov 2003 16:33:03 +0100 (CET)
From: Thomas Biege <[email protected]>
To: [email protected]Subject: SUSE Security Announcement: sane (SuSE-SA:2003:046)
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______________________________________________________________________________
SUSE Security Announcement
Package: sane
Announcement-ID: SuSE-SA:2003:046
Date: Tuesday, Nov 18th 2003 14:30 MEST
Affected products: 7.3, 8.0, 8.1
SuSE Linux Desktop 1.0
Vulnerability Type: remote denial-of-service
Severity (1-10): 5
SUSE default package: yes
Cross References: CAN-2003-0773
CAN-2003-0774
CAN-2003-0775
CAN-2003-0776
CAN-2003-0777
CAN-2003-0778
Content of this advisory:
1) security vulnerability resolved: several security vulnerabilities
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- ethereal
- KDE
- KDE wrong file permissions
- ircd
- mc
- apache1/2
- proftpd
- gdm2
- epic/epic4
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
The sane (Scanner Access Now Easy) package provides access to scanners
either locally or remotely over the network.
Several bugs in sane were fixed to avoid remote denial-of-service
attacks. These attacks can even be executed if the remote attacker
is not allowed to access the sane server by not listing the attackers
IP in the file sane.conf.
Per default saned only accepts local requests.
As a temporary workaround saned can be started via xinetd or inetd in
conjunction with tcpwrapper to restrict remote access.
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-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sane-1.0.8-143.i586.rpm
5b728bc3ac724be64aa736dbebe2aa23
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sane-1.0.8-143.i586.patch.rpm
77ab2574c35513136076c4b2a77e9cbf
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sane-1.0.8-143.src.rpm
6ddec5bdadb07f985a08e592cd4c68b3
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra2/sane-1.0.7-217.i386.rpm
9438d81c7bd8b41dee948696f138c771
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra2/sane-1.0.7-217.i386.patch.rpm
f461a294ab7d3638bf4b3e83f3910143
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sane-1.0.7-217.src.rpm
ea888fa0c4e6aaf41e23caaf4f68a1d2
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/gra1/sane-1.0.5-295.i386.rpm
53d25817ed9c53cf6078d3794862a13e
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sane-1.0.5-295.src.rpm
593a886a54482c841baa0fe9d43690c6
Sparc Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/gra1/sane-1.0.5-114.sparc.rpm
bdb7ce58c8d363a03dadc719c2421d84
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sane-1.0.5-114.src.rpm
4d0f4994f1fc730edfcefa2d33fe456d
PPC Power PC Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/gra1/sane-1.0.5-179.ppc.rpm
83643306b81f0e89d4a5c96001a65ea5
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sane-1.0.5-179.src.rpm
fa277cfb3ec68aedb24de2ff2d13673f
______________________________________________________________________________
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- ethereal
A new official version of ethereal, a network traffic analyzer, was
released to fix various security-related problems.
An update package is currently being tested and will be released
as soon as possible.
- KDE
New KDE packages are currently being tested. These packages fixes
several vulnerabilities:
+ remote root compromise (CAN-2003-0690)
+ weak cookies (CAN-2003-0692)
+ SSL man-in-the-middle attack
+ information leak through HTML-referrer (CAN-2003-0459)
The packages will be release as soon as testing is finished.
- KDE wrong file permissions
Due to a missing synchronisation during SuSE Linux 8.2 beta-testing
phase some configuration files of KDE on SuSE Linux 8.2 are world-
writeable. Please check the files in /etc/opt/kde3/share/config
and add an appropritae line to /etc/permissions.local, like:
/etc/opt/kde3/share/config/kmailrc root.root 0644
/etc/opt/kde3/share/config/kioslaverc root.root 0644
/etc/opt/kde3/share/config/kdeglobals root.root 0644
Set the new permission with 'chkstat -set /etc/permissions.local'
as root.
- ircd
The Internet Relay Chat daemon is vulnerable to a remote denial-of-
service attack. The attack can be triggered by irc clients directly
connected to the daemon.
Update packages are available on our FTP servers.
- mc
By using a special combination of links in archive-files it is possible
to execute arbitrary commands while mc tries to open it in its VFS.
The packages are currently tested and will be release as soon as
possible.
- apache1/2
The widely used HTTP server apache has several security vulnerabilities:
- locally exploitable buffer overflow in the regular expression code.
The attacker must be able to modify .htaccess or httpd.conf.
(affects: mod_alias and mod_rewrite)
- under some circumstances mod_cgid will output its data to the
wrong client (affects: apache2)
- proftpd
A remote denial-of-service attack in the FTP server proftpd was fixed.
The denial-of-service can be triggered by a one-byte buffer overflow
with a fixed character. Therefore the bug can not be abused by an
attacker to execute arbitrary code. If the binary is compiled with
version 3.x of gcc this bug may not even lead to denial-of-service
condition due to stack alignment.
Update packages are available on our FTP servers.
- gdm2
Two remote denial-of-service attacks were fixed in GDM.
Update packages are available on our FTP servers.
- epic/epic4
The well known IRC client epic can probably be exploited remotely by
a malicious server.
Update packages are available 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 <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 [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 <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 "[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]>.
[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)
send mail to:
<[email protected]> or
<[email protected]> respectively.
SUSE's security contact is <[email protected]> or <[email protected]>.
The <[email protected]> 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 <[email protected]>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <[email protected]>
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Bye,
Thomas
--
Thomas Biege <[email protected]>, SUSE LINUX AG, 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 83
--
... stay with me, save and ignorant, go back to sleep...
- Maynard James Keenan
