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SUSE Linux Advisory: sane

Nov 19, 2003, 05:02 (0 Talkback[s])

SUSE Security Announcement

Package: sane
Announcement-ID: SuSE-SA:2003:046
Date: Tuesday, Nov 18th 2003 14:30 MEST
Affected products: 7.3, 8.0, 8.1
SuSE Linux Desktop 1.0
Vulnerability Type: remote denial-of-service
Severity (1-10): 5
SUSE default package: yes
Cross References: CAN-2003-0773
CAN-2003-0774
CAN-2003-0775
CAN-2003-0776
CAN-2003-0777
CAN-2003-0778

Content of this advisory:

  1. security vulnerability resolved: several security vulnerabilities problem description, discussion, solution and upgrade information
  2. pending vulnerabilities, solutions, workarounds:
    • ethereal
    • KDE
    • KDE wrong file permissions
    • ircd
    • mc
    • apache1/2
    • proftpd
    • gdm2
    • epic/epic4
  3. standard appendix (further information)

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

The sane (Scanner Access Now Easy) package provides access to scanners either locally or remotely over the network.

Several bugs in sane were fixed to avoid remote denial-of-service attacks. These attacks can even be executed if the remote attacker is not allowed to access the sane server by not listing the attackers IP in the file sane.conf.
Per default saned only accepts local requests.

As a temporary workaround saned can be started via xinetd or inetd in conjunction with tcpwrapper to restrict remote access.

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/sane-1.0.8-143.i586.rpm 5b728bc3ac724be64aa736dbebe2aa23
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sane-1.0.8-143.i586.patch.r

pm 77ab2574c35513136076c4b2a77e9cbf
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sane-1.0.8-143.src.rpm 6ddec5bdadb07f985a08e592cd4c68b3

SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra2/sane-1.0.7-217.i386.rpm 9438d81c7bd8b41dee948696f138c771
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra2/sane-1.0.7-217.i386.patch.rpm f461a294ab7d3638bf4b3e83f3910143
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sane-1.0.7-217.src.rpm ea888fa0c4e6aaf41e23caaf4f68a1d2

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/gra1/sane-1.0.5-295.i386.rpm 53d25817ed9c53cf6078d3794862a13e
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sane-1.0.5-295.src.rpm 593a886a54482c841baa0fe9d43690c6

Sparc Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/gra1/sane-1.0.5-114.sparc.rpm bdb7ce58c8d363a03dadc719c2421d84
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sane-1.0.5-114.src.rpm 4d0f4994f1fc730edfcefa2d33fe456d

PPC Power PC Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/gra1/sane-1.0.5-179.ppc.rpm 83643306b81f0e89d4a5c96001a65ea5
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sane-1.0.5-179.src.rpm fa277cfb3ec68aedb24de2ff2d13673f


2) Pending vulnerabilities in SUSE Distributions and Workarounds:

  • ethereal A new official version of ethereal, a network traffic analyzer, was released to fix various security-related problems. An update package is currently being tested and will be released as soon as possible.
  • KDE New KDE packages are currently being tested. These packages fixes several vulnerabilities: + remote root compromise (CAN-2003-0690) + weak cookies (CAN-2003-0692) + SSL man-in-the-middle attack + information leak through HTML-referrer (CAN-2003-0459) The packages will be release as soon as testing is finished.
  • KDE wrong file permissions Due to a missing synchronisation during SuSE Linux 8.2 beta-testing phase some configuration files of KDE on SuSE Linux 8.2 are worldwriteable. Please check the files in /etc/opt/kde3/share/config and add an appropritae line to /etc/permissions.local, like:

    /etc/opt/kde3/share/config/kmailrc root.root 0644 /etc/opt/kde3/share/config/kioslaverc root.root 0644 /etc/opt/kde3/share/config/kdeglobals root.root 0644 Set the new permission with 'chkstat -set /etc/permissions.local' as root.

  • ircd The Internet Relay Chat daemon is vulnerable to a remote denial-ofservice attack. The attack can be triggered by irc clients directly connected to the daemon. Update packages are available on our FTP servers.
  • mc By using a special combination of links in archive-files it is possible to execute arbitrary commands while mc tries to open it in its VFS. The packages are currently tested and will be release as soon as possible.
  • apache1/2 The widely used HTTP server apache has several security vulnerabilities:
    • locally exploitable buffer overflow in the regular expression code. The attacker must be able to modify .htaccess or httpd.conf. (affects: mod_alias and mod_rewrite)
    • under some circumstances mod_cgid will output its data to the wrong client (affects: apache2)
  • proftpd A remote denial-of-service attack in the FTP server proftpd was fixed. The denial-of-service can be triggered by a one-byte buffer overflow with a fixed character. Therefore the bug can not be abused by an attacker to execute arbitrary code. If the binary is compiled with version 3.x of gcc this bug may not even lead to denial-of-service condition due to stack alignment. Update packages are available on our FTP servers.
  • gdm2 Two remote denial-of-service attacks were fixed in GDM. Update packages are available on our FTP servers.
  • epic/epic4 The well known IRC client epic can probably be exploited remotely by a malicious server. Update packages are available on our FTP servers.

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.
    3. 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.
    4. 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:
      1. gpg is installed
      2. 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>

Bye,

Thomas
--
Thomas Biege <thomas@suse.de>, SUSE LINUX AG, Security Support & Auditing