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Home » Hacking News » SuSE Security Announcement: libpng (SuSE-SA:2003:0004)

SuSE Security Announcement: libpng (SuSE-SA:2003:0004)

by Nikola Strahija on January 14th, 2003 The library libpng provides several functions to encode, decode and manipulate Portable Network Graphics (PNG) image files. Due to wrong calculation of some loop offset values a buffer overflow can occur. The buffer overflow can lead to Denial-of-Service or even to remote compromise.


Package: libpng
Announcement-ID: SuSE-SA:2003:0004
Date: Tuesday, Jan 14th 2003 11:00 MEST
Affected products: 7.1, 7.2, 7.3, 8.0, 8.1
SuSE Linux Database Server
SuSE eMail Server 3.1
SuSE eMail Server III
SuSE Firewall Adminhost VPN
SuSE Linux Admin-CD for Firewall
SuSE Firewall on CD 2 - VPN
SuSE Firewall on CD 2
SuSE Linux Enterprise Server for S/390
SuSE Linux Connectivity Server
SuSE Linux Enterprise Server 7
SuSE Linux Enterprise Server 8
SuSE Linux Office Server
UnitedLinux 1.0
Vulnerability Type: possible remote compromise
Severity (1-10): 4
SuSE default package: yes
Cross References: CAN-2002-1363

Content of this advisory:
1) security vulnerability resolved: wrong offset calculation
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- fam
- xpdf
- libmcrypt
3) standard appendix (further information)

______________________________________________________________________________

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

The library libpng provides several functions to encode, decode and
manipulate Portable Network Graphics (PNG) image files.
Due to wrong calculation of some loop offset values a buffer overflow
can occur. The buffer overflow can lead to Denial-of-Service or even
to remote compromise.

After updating libpng all applications that use libpng should be
restarted. Due to the fact that a lot of applications are linked
with libpng it may be necessary to switch to runlevel S and back
to the previous runlevel or even to reboot the system.

There is no temporary fix known. Please install the new packages from
our FTP servers.

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/libpng-1.2.4-58.i586.rpm
7d21806e31c16a9c4bf351b303ce81aa
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/libpng-1.2.4-58.i586.patch.rpm
3efc4170990f081117c8106efd7bed33
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/libpng-1.2.4-58.src.rpm
a24985f7c0bb5a54c87115a7944a87cf

SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra1/libpng-2.1.0.12-160.i386.rpm
13d9eef080381224c1e4e0d168401a27
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra1/libpng-2.1.0.12-160.i386.patch.rpm
fc75c7843967f914810520bc0d63503b
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/libpng-2.1.0.12-160.src.rpm
0269d8c6fa56109120d5933fd914b82b

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/gra1/libpng-2.1.0.12-160.i386.rpm
707082f5742ee15ed94de2df066963a2
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/libpng-2.1.0.12-160.src.rpm
1206600c361fefc09efb83887203d00a

SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/gra1/libpng-2.1.0.10-57.i386.rpm
9a6ee6c1a3344be521398aca8b613f03
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/libpng-2.1.0.10-57.src.rpm
c5fe80f3683a1c62e9ae84c4e1541e5a

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/gra1/libpng-2.1.0.8-17.i386.rpm
d2e6e198fdbe2e3bb0a3ba2b8dc3e524
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/libpng-2.1.0.8-17.src.rpm
024121c035b54982ea5b8394804cc796




Sparc Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/gra1/libpng-2.1.0.12-99.sparc.rpm
305317e07da2749b6d198d4899c4313c
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/libpng-2.1.0.12-99.src.rpm
2d4302f4b6a4fb29d392aef053539fc4





AXP Alpha Platform:

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/gra1/libpng-2.1.0.8-24.alpha.rpm
970e51672298667bb1b5d0a66ff2fd89
source rpm(s):
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/libpng-2.1.0.8-24.src.rpm
bdef09c298521393a95f3bc0d6737e03

SuSE-7.0:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/gra1/libpng-2.1.0-246.alpha.rpm
9706c75ee0fd42cce789be5a9c8a62e3
source rpm(s):
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/libpng-2.1.0-246.src.rpm
a5b96e5c5757bad8c4435079c3083564



PPC Power PC Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/gra1/libpng-2.1.0.12-131.ppc.rpm
bcab26f1476ba950d6437b85d5c58c88
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/libpng-2.1.0.12-131.src.rpm
0ba6353d4333e07dd8bbdfa7cc762c28

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/gra1/libpng-2.1.0.8-22.ppc.rpm
5f809fddcb5b1db352a06155b4e71aaa
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/libpng-2.1.0.8-22.src.rpm
58cea385332541d566b397e627755cdc


______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- fam
SuSE Versions < 8.0 are shipping a vulnerable version of fam
which allows unprivileged users to determine filenames of
group root.
New fam packages are build and will be released right after
quality assurance permits.
- xpdf
An integer overflow in pdftops may lead to system compromise.
New packages are currently being build.
- libmcrypt
Several buffer overflows in libmcrypt were discovered by Ilia
Alshanetsky. The buffer overflows can lead to system compromise.
New packages are currently being build.


______________________________________________________________________________

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.

=====================================================================
SuSE's security contact is or .
The 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.


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