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ISS X-Force reported an overflow in BSD's lineprinter daemon shipped with the lprold package in SuSE Linux.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: lprold
Announcement-ID: SuSE-SA:2001:033
Date: Wed Oct 10 11:03:12 GMT 2001
Affected SuSE versions: [6.1, 6.2,] 6.3, 6.4, 7.0, 7.1, 7.2
Vulnerability Type: bufferoverflow/local privilege escalation
Severity (1-10): 6
SuSE default package: yes
Other affected systems: Other Linux distributions, *BSD
Content of this advisory:
1) security vulnerability resolved: Several problems in lprold
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
ISS X-Force reported an overflow in BSD's lineprinter daemon shipped with
the lprold package in SuSE Linux. Due to missing bounds checks in the
lockfile processing function, internal buffers may overflow. Bounds checks
have been added to fix that problem.
Additionally the SuSE Security Team uncovered other security releated bugs
in lpd while analyzing lpd source after receiving the X-Force advisory.
These bugs allows users on machines listed in /etc/hosts.lpd or
/etc/hosts.equiv to chown any file on the system running lpd to any user.
In order to trigger any of the fixed bugs (including the overflow) the
attackers machine must be listed in one of these two access-files and the
attacker usually needs root on these machines due to the privileged-port
requirement.
Please download the packages and verify them as described in section 3.
After successful authentication you can update your packages with
the command `rpm -Uhv file.rpm'.
As root invoke the command "/etc/rc.d/lpd stop" to shutdown the old lpd
daemon and "/etc/rc.d/lpd start" afterwards to start the patched daemon.
i386 Intel Platform:
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/lprold-3.0.48-272.i386.rpm
23b8251411a557563cb314102f405d31
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/lprold-3.0.48-272.src.rpm
ff590e05f2a7c85e9d234bd32d12b13a
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/lprold-3.0.48-275.i386.rpm
b6efc424262ec9aaa39ac84f230b3df2
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/lprold-3.0.48-275.src.rpm
5a95de121c7520bf33620dddbfdda611
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/lprold-3.0.48-275.i386.rpm
10792a921880048970f40470f1b94330
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/lprold-3.0.48-275.src.rpm
094b06515dfd865c6dffedf70de5e6cc
SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/lprold-3.0.48-275.i386.rpm
da1b920d23694a807f91c74301b47ced
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/lprold-3.0.48-275.src.rpm
c2c45f04a2d44e374689346f488e8c52
SuSE-6.3
ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/lprold-3.0.48-275.i386.rpm
8f7c5538e878f197de1e6dacdb6a8479
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/lprold-3.0.48-275.src.rpm
d13f74f6449ee40b98b2ed0e42e9d2ec
Sparc Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/lprold-3.0.48-216.sparc.rpm
78a947db44bc4a41cb33eee1b931b99e
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/lprold-3.0.48-216.src.rpm
2c873632eaa6f01efb45cba3f1308cd3
SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/lprold-3.0.48-216.sparc.rpm
45320846ee6143fdfc27a7d578f630bd
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/lprold-3.0.48-216.src.rpm
1be6f31b6924f81fb965b0dce053f6cb
AXP Alpha Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/lprold-3.0.48-215.alpha.rpm
94af7565e8920cdce6e1e7c51f562fba
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/lprold-3.0.48-215.src.rpm
0757d322145ef6c2179c8e31b1169cd2
SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/lprold-3.0.48-215.alpha.rpm
3c6a2b2b21fcc1b94974aca6c5930e98
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/lprold-3.0.48-215.src.rpm
0222dec4d0287b9f1f267b86e8e8a4dd
SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/lprold-3.0.48-215.alpha.rpm
f4c618b43a95bd94ed679c1c2119a7aa
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/lprold-3.0.48-215.src.rpm
0430ec91e7515d79326ed16f492ea60e
SuSE-6.3
ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/lprold-3.0.48-215.alpha.rpm
68a8b9a26e17ed5183b8385be349c6a9
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/lprold-3.0.48-215.src.rpm
582d925d8328f79bc566dddcc62f763b
Power PC Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/lprold-3.0.48-200.ppc.rpm
3c16c1975b8f9dae3ccfb67dd5f462db
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/lprold-3.0.48-200.src.rpm
37b0d3534e39273e158eba42f75f8e31
SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/lprold-3.0.48-200.ppc.rpm
d0e5a115d8991e711ef75fc8b06e1d97
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/lprold-3.0.48-200.src.rpm
e4d589e9225365b103b502a26d0fd73f
SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/lprold-3.0.48-200.ppc.rpm
f8e7557f995388564f98e9bae4708e4e
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/lprold-3.0.48-200.src.rpm
78a647beeaf5a5541cb15aa6435ba65e
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- sftp/openssh:
Our last announcement SuSE-SA:2001:032 about WindowMaker claimed
that the openssh packages on SuSE distributions do not contain the
sftp-server as described by Peter W <peterw@usa.net> on the bugtraq
mailing list. This is wrong: The program is indeed included on all
recent openssh packages of SuSE Linux distributions, starting with
SuSE Linux 6.4 where the openssh package appeared first.
We will provide fixes for the distributions 6.4 through 7.2 as soon as
possible on our ftp server (ftp.suse.de for 6.4-7.0, http://ftp.suse.com for
7.1 and newer) and announce these fixes in the section 2) of an
upcoming security announcement.
Please note that this error has been corrected shortly before the
release of the upcoming SuSE Linux 7.3 which will arrive in the stores
by the end of this week.
We apologize for this error (Roman Drahtmueller, SuSE Security).
- squid
Malformed requests on the client side can cause the squid proxy server
to die, resulting in a denial of service attack that can be launched
from the internal network if squid is used at the edge of an internal
network to proxy requests to the internet.
We are in the process of testing the update packages that are
available on the ftp server shortly. SuSE Security will issue a
dedicated announcement for this issue shortly.
- devfs/kernel
SuSE Linux ships the userspace utilities for the use of the devfs
filesystem in the linux kernel, but neither the utilities nor the
filesystem interface for device files itself have been used in SuSE
Linux up to date. The decision to not actively use devfsd in the
distribution framework is based on security considerations.
For these reasons, SuSE products are not susceptible to the lately
found security problems in the devfs implementation.
______________________________________________________________________________
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 security@suse.de),
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 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 "build@suse.de" upon installation or upgrade, provided that
the package gpg is installed. The file containing the public key
is placed at the toplevel 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:
suse-security@suse.com
- general/linux/SuSE security discussion.
All SuSE security announcements are sent to this list.
To subscribe, send an email to
<suse-security-subscribe@suse.com>.
suse-security-announce@suse.com
- SuSE's announce-only mailing list.
Only SuSE's security annoucements are sent to this list.
To subscribe, send an email to
<suse-security-announce-subscribe@suse.com>.
For general information or the frequently asked questions (faq)
send mail to:
<suse-security-info@suse.com> or
<suse-security-faq@suse.com> respectively.
===================================================
SuSE's security contact is <security@suse.com>.
The <security@suse.com> 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 cleartext signature shows proof of the
authenticity of the text.
SuSE GmbH 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 <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>
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--
~
~ perl self.pl
~ $_='print"$_=47$_47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
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