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Home » Hacking News » SuSE Security Announcement: cups (SuSE-SA:2003:002)

SuSE Security Announcement: cups (SuSE-SA:2003:002)

by Nikola Strahija on January 3rd, 2003 Content of this advisory: 1) security vulnerability resolved: several bugs problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - none 3) standard appendix (further information)


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

CUPS is a well known and widely used printing system for unix-like
systems. iDFENSE reported several security issues with CUPS that can
lead to local and remote root compromise. The following list
includes all vulnerabilities:
- integer overflow in HTTP interface to gain remote
access with CUPS privileges
- local file race condition to gain root (bug mentioned
above has to be exploited first)
- remotely add printers
- remote denial-of-service attack due to negative length in
memcpy() call
- integer overflow in image handling code to gain higher privileges
- gain local root due to buffer overflow of 'options' buffer
- design problem to gain local root (needs added printer, see above)
- wrong handling of zero width images can be abused to gain higher
privileges
- file descriptor leak and denial-of-service due to missing checks
of return values of file/socket operations

Since SuSE 8.1 CUPS is the default printing system.

As a temporary workaround CUPS can be disabled and an alternative
printing system like LPRng can be installed instead.

New CUPS packages are available on our FTP servers. Please, install
them to fix your system.

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/cups-1.1.15-69.i586.rpm
2531f8cf2c7ffbc45f5bdabbad31b312
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cups-1.1.15-69.i586.patch.rpm
048c97ac172f3a838bb3e4789250cd56

ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cups-libs-1.1.15-69.i586.rpm
3daffc6cac8a067c2a8b52768ada25a0
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cups-libs-1.1.15-69.i586.patch.rpm
74045133ea1780aa311dab78af0ea7a5

ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cups-client-1.1.15-69.i586.rpm
593fedd856a9568147f76e70cdd32b94
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cups-client-1.1.15-69.i586.patch.rpm
9a67ef7fd0162283d662581866a68263

source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/cups-1.1.15-69.src.rpm
cad9236a0f71d1ad263c4c79e6d4337f

SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/cups-1.1.12-90.i386.rpm
9d1d9c3cc395e6355da6f8f1b9ccee5c
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/cups-1.1.12-90.i386.patch.rpm
b17bfb78daac61a05c92e938e2d89463

ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/cups-libs-1.1.12-90.i386.rpm
9ec263cb51c223798818509f50246ec9
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/cups-libs-1.1.12-90.i386.patch.rpm
a59edfa5ba38116ccd4c264863c4bbf8

ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/cups-client-1.1.12-90.i386.rpm
fef9316839a2747111201b5e035295ad
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/cups-client-1.1.12-90.i386.patch.rpm
80525203e712a959badab348d07f81a9

source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/cups-1.1.12-90.src.rpm
4cad7db5ae424516502c820d29402989

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/cups-1.1.10-94.i386.rpm
e456c6027c8e63a8e3c1773cc2d4d531

ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/cups-libs-1.1.10-94.i386.rpm
53bfc694bc74e4220eba66f569dd837b

ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/cups-client-1.1.10-94.i386.rpm
7ed2406d49693fa148eaf27ac3083010

source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/cups-1.1.10-94.src.rpm
0e33f13aedce730069b3e1788eb19a0e

SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/cups-1.1.6-122.i386.rpm
f6651e3f296ac2e19edb6403c2f92e7e
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/cups-1.1.6-122.src.rpm
42015fbabce4f6bc22cf4d94061ca657

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/cups-1.1.6-121.i386.rpm
f9b1f8aee6cad0ef7787dffc2a4309b1
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/cups-1.1.6-121.src.rpm
f1db871d4a9b921bdffe71023fb294f9



Sparc Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/cups-1.1.10-45.sparc.rpm
0c614102570716b33a96723867d071df

ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/cups-libs-1.1.10-45.sparc.rpm
d15e6354a448240275966dd46f7e02ed

ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/cups-client-1.1.10-45.sparc.rpm
b21ce5aaa79dd60897eed762e119a65d

source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/cups-1.1.10-45.src.rpm
83bd4b66daeba343549d0f8abd80a537



AXP Alpha Platform:

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/cups-1.1.6-40.alpha.rpm
f68f6f596934365ae44d8dafc7aaa897
source rpm(s):
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/cups-1.1.6-40.src.rpm
f10402e4bada55969e6a1fb651c8f37b



PPC Power PC Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/cups-1.1.10-81.ppc.rpm
3b15601c7838620311514cc244e45078

ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/cups-libs-1.1.10-81.ppc.rpm
c1ca0adfa7c4091260c64e3c58ea20f1

ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/cups-client-1.1.10-81.ppc.rpm
b63eef9ec012b5e17bfcfce558829f94

source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/cups-1.1.10-81.src.rpm
58850c0f45f62a79146fa536fc91ded7

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/cups-1.1.6-53.ppc.rpm
1a31de608674e8a1224b22bd3b9a792a
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/cups-1.1.6-53.src.rpm


______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- none
______________________________________________________________________________

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.

Type Bits/KeyID Date User ID
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key


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