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Home » Hacking News » SuSE SA:2003:0014: lprold buffer overflow

SuSE SA:2003:0014: lprold buffer overflow

by Nikola Strahija on March 13th, 2003 A vulnerability has been found in lprold, which can allow a malicious attacker to execute arbitrary code and thus gain root privileges.


-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

SuSE Security Announcement

Package: lprold
Announcement-ID: SuSE-SA:2003:0014
Date: Thursday, Mar 13th 2003 16:58 MET
Affected products: 7.1, 7.2, 7.3
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 Office Server
Vulnerability Type: local privilege escalation
Severity (1-10): 3
SuSE default package: yes
Cross References:

Content of this advisory:
1) security vulnerability resolved: buffer overflow in lprm
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- ethereal
- qpopper
- XFree4
- sendmail
- apcupsd
- snort
- file
- zlib
- vnc
3) standard appendix (further information)

______________________________________________________________________________

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

The lprm command of the printing package lprold shipped till SuSE 7.3
contains a buffer overflow. This buffer overflow can be exploited by
a local user, if the printer system is set up correctly, to gain root
privileges.
lprold is installed as default package and has the setuid bit set.

As a temporary workaround you can disable the setuid bit of lprm by
executing the following tasks as root:
- add "/usr/bin/lprm root.root 755" to /etc/permissions.local
- run 'chkstat -set /etc/permissions.local'
Another way would be to just allow trusted users to run lprm by
executing the following tasks as root:
- add "/usr/bin/lprm root.trusted 4750" to /etc/permissions.local
- run 'chkstat -set /etc/permissions.local'

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-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/lprold-3.0.48-408.i386.rpm
52a301d88fce69dcf2de53c86d70f51e
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/lprold-3.0.48-408.src.rpm
9907cc1bd077493d0bb1a0e646a20022

SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/lprold-3.0.48-407.i386.rpm
364faa0d5266e36d7db90ac223137f2d
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/lprold-3.0.48-407.src.rpm
eff9c0ff34e0ad0d313477b998964a26

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/lprold-3.0.48-407.i386.rpm
5454e913e660a6d409a200a3ddd19f8b
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/lprold-3.0.48-407.src.rpm
ad22928b988b8ed055ab5698e15479e4



Sparc Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/lprold-3.0.48-273.sparc.rpm
88a5f8cf7db0c123776b4fa9f47e9205
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/lprold-3.0.48-273.src.rpm
83860e8bd337b3617f8c59605c8ff847




AXP Alpha Platform:

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/lprold-3.0.48-270.alpha.rpm
651c6141e07560763f07b74c1506d668
source rpm(s):
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/lprold-3.0.48-270.src.rpm
96b67fb75ae0c4702f6e881c665f81dd



PPC Power PC Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/lprold-3.0.48-297.ppc.rpm
8caba2cc70f7edfa96c23ac3bab3e8bf
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/lprold-3.0.48-297.src.rpm
b1741e591445aef7b8aaf83a8a4a34ef

SuSE-7.1:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/lprold-3.0.48-297.ppc.rpm
1b86cd16e6e5b8e63252b9c9a6acd5b9
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/lprold-3.0.48-297.src.rpm
e44adcc90b604bc4dc81b43e57f6e161




______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- ethereal
A format string bug in ethereal's SOCKS handling code and a buffer
overflow in the NTLMSSP was found in ethereal. Both bugs may lead
to remote system compromise.
New packages are currently being build and will be available soon.

- qpopper
In version 4.0.x of qpopper a buffer overflow *after* user authen-
tication can be exploited to gain a shell on a POP-server machine.
New packages are currently being build and will be available soon.

- XFree4
A buffer overflow in the Xlib code can be triggered while handling
the environment variable XLOCALEDIR. The X version affected is 4.2.0
(SuSE Linux 8.0 and 8.1).
We still investigate this issue.

- sendmail
A correction is necessary to the last SuSE Security Announcement
(SuSE-SA:2003:013) about sendmail: The Vulnerability Type must read
remote buffer overflow.

- apcupsd
The control and management daemon for APC UPS systems is vulnerable
to remote code execution due to buffer overflow and format string bugs.
A dedicated advisory for this issue will be released as soon as all
packages are build.

- snort
snort, a sensor-based Network Intrusion Detection System, was
vulnerable to a buffer overflow in it's RPC preprocessor.
As a workaround the following line in snort.conf should be commented
out and snort should be restarted to disable the RPC-preprocessor:
preprocessor rpc_decode: 111 32771
Future version of SuSE Linux will be shipped with a fixed snort
package.

- file
A locally exploitable buffer overflow was found in the file command.
New packages are currently being build and will be available soon.

- zlib
zlib's function gzprintf() is prone to a buffer overflow if its
arguments expand to more then Z_PRINTF_BUFSIZE bytes.
A fixed version of zlib will be shipped with future SuSE Linux
versions.

- vnc
VNC (Virtual Network Computing) uses a weak cookie generation process
which can be exploited by an attacker to bypass authentication.
New packages are currently being tested and will be available on our
FTP servers soon.

______________________________________________________________________________

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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