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The lprng package contains the "runlpr" program which allows the lp user to execute the lpr program as root. Local attackers can pass certain commandline arguments to lpr running as root, fooling it to execute arbitrary commands as root. This has been fixed. Note that this vulnerability can only be exploited if the attacker has previously gained access to the lp account.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: lprng, html2ps
Announcement-ID: SuSE-SA:2002:040
Date: Thu Oct 31 11:00:10 MET 2002
Affected products: 7.0, 7.1, 7.2, 7.3, 8.0, 8.1
SuSE eMail Server III, 3.1
SuSE Firewall on CD/Admin host
SuSE Firewall on CD 2
SuSE Linux Connectivity Server
SuSE Linux Enterprise Server 7
SuSE Linux Office Server
Vulnerability Type: local privilege escalation,
remote command execution
Severity (1-10): 6
SuSE default package: yes
Cross References: -
Content of this advisory:
1) security vulnerability resolved: Local privilege escalation in
runlpr (from lprng package) and remote command execution
via html2ps printfilter.
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
The lprng package contains the "runlpr" program which allows the lp
user to execute the lpr program as root. Local attackers can pass
certain commandline arguments to lpr running as root, fooling it
to execute arbitrary commands as root. This has been fixed.
Note that this vulnerability can only be exploited if the attacker
has previously gained access to the lp account.
Additionally, the html2ps printfilter, which is installed as part of
the LPRng print system, allowed remote attackers to execute arbitrary
commands in the context of the lp user.
These two issues combined allow attackers to mount a remote root attack.
As a workaround, we recommend to uninstall the html2ps package, and
restrict access to your print services to authorized hosts only.
Access control to lpd is implemented by adding appropriate entries to the
/etc/lpd.perms file. Please consult the lpd.perms(5) manpage, or add the
single line
DEFAULT REJECT
to your /etc/lpd.perms file to deny access to everyone from the outside.
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.
i386 Intel Platform:
SuSE-8.1
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/html2ps-1.0b3-458.i586.rpm
c1990d8139e33176fb02745f3e5b0a05
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/html2ps-1.0b3-458.src.rpm
f42f18d885dc2fe5701bc74812fd6ceb
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/lpdfilter-0.43-63.i586.rpm
cc79a87fd8fcc9cf92356ab4863babc6
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/lpdfilter-0.43-63.src.rpm
0ad433931936c4ba5a644de9104b3db4
SuSE-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra1/html2ps-1.0b3-456.i386.rpm
c14c59d1f23575841a95f7d5eaf6f734
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/html2ps-1.0b3-456.src.rpm
7ffd5b01e399ee427a0d3a16d15af4f1
ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap1/lpdfilter-0.42-155.i386.rpm
dd04dd60c4c18b5711643f6334b97bfd
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/lpdfilter-0.42-155.src.rpm
4d6b611c572d251f47c0b4cf8ab7a28d
SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/gra1/html2ps-1.0b3-457.i386.rpm
28a1aee8dfedfff3eb348fc4ea4a8876
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/html2ps-1.0b3-457.src.rpm
2765c61e39616199cbf5066d719280b3
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/gra1/html2ps-1.0b1-432.i386.rpm
1ab553d151c65505184353ae6e514db6
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/html2ps-1.0b1-432.src.rpm
b71dba7782caeb01954b418e3ffdd6c2
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/gra1/html2ps-1.0b1-431.i386.rpm
1d9adfc7cc1e141f340b844f040bfe85
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/html2ps-1.0b1-431.src.rpm
b1b29ff154fc13cb806dec49fc00ff81
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/gra1/html2ps-1.0b1-428.i386.rpm
7e0bd236c647cd70ba9b0274f7b5cf53
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/html2ps-1.0b1-428.src.rpm
b60e012d057e428e6ade468d46afd4e5
Sparc Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/gra1/html2ps-1.0b3-88.sparc.rpm
b6c1c7399a041477ce0c321a9eda383b
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/html2ps-1.0b3-88.src.rpm
8102e2145e43fb6486cee5ccfc106c67
AXP Alpha Platform:
SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/gra1/html2ps-1.0b1-328.alpha.rpm
83967dc5d7dcf672c6dd902c125a3e81
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/html2ps-1.0b1-328.src.rpm
e3851c0f69017811168213a707431467
PPC Power PC Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/gra1/html2ps-1.0b1-303.ppc.rpm
b9cb5de37503927812f767a0781bfc6a
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/html2ps-1.0b1-303.src.rpm
be58c62e270d5cbc2aa3395beae91009
SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/gra1/html2ps-1.0b1-302.ppc.rpm
a98f5628ae1068b3d7f20b83ace9bb77
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/html2ps-1.0b1-302.src.rpm
5a425dbc64f2e0f2a368ecb566c624eb
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
There is no additional information this time.
______________________________________________________________________________
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 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 "build@suse.de" 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:
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 announcements 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> or <security@suse.de>.
The <security@suse.de> 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 <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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