Date: Fri, 22 Oct 2004 16:59:29 +0200
From: Marcus Meissner <[email protected]>
To: [email protected]Subject: SuSE Security Announcement: libtiff (SUSE-SA:2004:038)
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______________________________________________________________________________
SUSE Security Announcement
Package: libtiff
Announcement-ID: SUSE-SA:2004:038
Date: Friday, Oct 22nd 2004 18:00 MEST
Affected products: 8.1, 8.2, 9.0, 9.1
SUSE Linux Enterprise Server 8, 9
SUSE Linux Desktop 1.0
Vulnerability Type: code execution
Severity (1-10): 9
SUSE default package: yes
Cross References: CAN-2004-0803
CAN-2004-0804
CAN-2004-0886
CAN-2004-0929
Content of this advisory:
1) security vulnerability resolved:
- several buffer overflows and related problems in
libtiff were fixed.
problem description
2) solution/workaround
3) special instructions and notes
4) package location and checksums
5) pending vulnerabilities, solutions, workarounds:
- security problems in PDF viewers
- freeradius denial of service problems
- mpg123 buffer overflow
6) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion
libtiff is used by image viewers and web browser to view "TIFF" images.
These usually open and display those images without querying the user,
making a normal system by default vulnerable to exploits of image
library bugs.
Chris Evans found several security related problems during an audit of
the image handling library libtiff, some related to buffer overflows,
some related to integer overflows and similar. This issue is being
tracked by the CVE ID CAN-2004-0803.
Matthias Claasen found a division by zero in libtiff. This is tracked
by the CVE ID CAN-2004-0804.
Further auditing by Dmitry Levin exposed several additional integer
overflows. These are tracked by the CVE ID CAN-2004-0886.
Additionally, iDEFENSE Security located a buffer overflow in the OJPEG
(old JPEG) handling in the SUSE libtiff package. This was fixed by
disabling the old JPEG support and is tracked by the CVE ID CAN-2004-0929.
SUSE wishes to thank all the reporters, auditors, and programmers
for helping to fix these problems.
2) solution/workaround
There is no workaround. Update the libtiff packages.
3) special instructions and notes
Make sure that you restart your web browser after updating.
4) package location and checksums
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.
You can also use the YaST Online Update tool to install the security
updates.
Our maintenance customers are being notified individually. The packages
are being offered for installation from the maintenance web.
x86 Platform:
SUSE Linux 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/libtiff-3.6.1-38.12.i586.rpm
cd373c181599ebbf3be0f021b811c7da
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/libtiff-3.6.1-38.12.i586.patch.rpm
a45416ea1ac9628b9e4e7e6f09653cb5
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/tiff-3.6.1-38.12.src.rpm
2387abe21eebb97f319b6ddf1a982314
SUSE Linux 9.0:
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/libtiff-3.5.7-376.i586.rpm
db8b4d23eb887b3c391f5262f766ff86
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/libtiff-3.5.7-376.i586.patch.rpm
58112fc9e5c6395bc316f3b46ffeb0ca
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/tiff-3.5.7-376.src.rpm
0810ea6ffe77b7a450698386a6238e61
SUSE Linux 8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/libtiff-3.5.7-376.i586.rpm
339e0ce21cceadb883d2022ec01c1219
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/libtiff-3.5.7-376.i586.patch.rpm
608c1b39e6d67c9da02e02d2176b7a97
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/tiff-3.5.7-376.src.rpm
8891d3c8ff0dd0f283f63d4b3021b894
SUSE Linux 8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/libtiff-3.5.7-376.i586.rpm
______________________________________________________________________________
5) Pending vulnerabilities in SUSE Distributions and Workarounds:
- security problems in pdf viewers
Chris Evans, Dmitry Levin and others found several buffer and
integer overflow problems in xpdf and xpdf clones.
These are being tracked under the CVE Ids CAN-2004-0888 and
CAN-2004-0889.
New packages will be available soon.
- freeradius
Several bugs that can be abused to remotely crash freeradius have
been discovered (CAN-2004-0938, CAN-2004-0960, CAN-2004-0961).
New packages will be available soon.
- mpg123
A buffer overflow in mpg123 has been discovered. New packages will
be available soon.
______________________________________________________________________________
6) 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 recommend against subscribing to security lists that cause the
e-mail 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
file name 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 "[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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