SuSE Security Announcement: lprold

Type securityvulns
Reporter Securityvulns
Modified 2001-10-11T00:00:00



                    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
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:

source rpm:

source rpm:

source rpm:

source rpm:

source rpm:

Sparc Platform:

source rpm:

source rpm:

AXP Alpha Platform:

source rpm:

source rpm:

source rpm:

source rpm:

Power PC Platform:

source rpm:

source rpm:

source rpm:

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 <> 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 ( for 6.4-7.0, 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, 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 "" 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 .

  • SuSE runs two security mailing lists to which any interested party may subscribe: - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to <>. - SuSE's announce-only mailing list. Only SuSE's security annoucements 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 <>. 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 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 <> pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <>

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