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full-disclosure-uk: [Full-disclosure] SUSE Security Announcement

[Full-disclosure] SUSE Security Announcement: bind (SUSE-SA:2008:033)

From: Thomas Biege <thomas_at_nospam>
Date: Fri Jul 11 2008 - 07:59:22 GMT
To: full-disclosure@lists.grok.org.uk

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SUSE Security Announcement Package: bind Announcement ID: SUSE-SA:2008:033 Date: Fri, 11 Jul 2008 09:00:00 +0000 Affected Products: openSUSE 10.2 openSUSE 10.3 openSUSE 11.0 SUSE SLES 9 Novell Linux Desktop 9 Open Enterprise Server Novell Linux POS 9 SUSE Linux Enterprise Desktop 10 SP1 SLE SDK 10 SP1 SLE SDK 10 SP2 SUSE Linux Enterprise Server 10 SP1 SUSE Linux Enterprise Desktop 10 SP2 SUSE Linux Enterprise Server 10 SP2 Vulnerability Type: DNS cache poisoning Severity (1-10): 9 SUSE Default Package: no Cross-References: CVE-2008-1447 Content of This Advisory: 1) Security Vulnerability Resolved: DNS cache poisoning 2) Solution or Work-Around 3) Special Instructions and Notes 4) Package Location and Checksums 5) Pending Vulnerabilities, Solutions, and Work-Arounds: 6) Authenticity Verification and Additional Information
______________________________________________________________________________
  1. Problem Description and Brief Discussion

   The bind daemon is responsible for resolving hostnames in IP addresses and    vice versa.
   The new version of bind uses a random transaction-ID (TRXID) and a random    UDP source-port for DNS queries to address DNS cache poisoning attacks    possible because of the "birthday paradox" and an attack discovered by Dan    Kaminsky. Unfortunately we do not have details about Kaminsky's attack and    have to trust the statement that a random UDP source-port is sufficient to    stop it.
   DNS servers that do not support recursive queries or do not use a cache    (authoritative only servers) are not vulnerable too.  

   Update packages of bind9 for SLES8 will be available soon.   

   The glibc stub resolver is known to be vulnerable too and we will publish    updates as soon as possible.    

   Note, a local attacker can always sniff DNS queries and generate spoofed    responses easily.    

   If you use the UDP source-port number of the DNS server in your firewall    configuration, for example to let DNS queries through your packetfilter,    then you have to take steps to adapt your filter rules to the new behavior    of the DNS server.

2) Solution or Work-Around

   To protect your infrastructure from cache poisoning attacks you should    provide two DNS servers.
   One that is authoritative only and accessible from the Internet to resolve    queries for your local systems that are available over the Internet. The    other system (caching) is not accessible over the Internet and can be used    by internal clients to recursively lookup names and addresses.

   But we encourage you to install the bind update as soon as possible too.    

   If you use the latest update of pdns-recursor you are not vulnerable to    this attack.

   For the glibc stub resolver bug you can install a local secure DNS forwarder     on your machine or make a DNS forwarder available for a protected    network.

3) Special Instructions and Notes

   Please restart the bind daemon after the update.

4) Package Location and Checksums

   The preferred method for installing security updates is to use the YaST    Online Update (YOU) tool. YOU detects which updates are required and    automatically performs the necessary steps to verify and install them.    Alternatively, download the update packages for your distribution manually    and verify their integrity by the methods listed in Section 6 of this    announcement. Then install the packages using the command

     rpm -Fhv <file.rpm>

   to apply the update, replacing <file.rpm> with the filename of the    downloaded RPM package.    

   x86 Platform:    

   openSUSE 11.0: http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-9.4.2-39.2.i586.rpm http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-chrootenv-9.4.2-39.2.i586.rpm http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-devel-9.4.2-39.2.i586.rpm http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-doc-9.4.2-39.2.i586.rpm http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-libs-9.4.2-39.2.i586.rpm http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-utils-9.4.2-39.2.i586.rpm

   openSUSE 10.3: http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-9.4.1.P1-12.5.i586.rpm http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-chrootenv-9.4.1.P1-12.5.i586.rpm http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-devel-9.4.1.P1-12.5.i586.rpm http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-doc-9.4.1.P1-12.5.i586.rpm http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-libs-9.4.1.P1-12.5.i586.rpm http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-utils-9.4.1.P1-12.5.i586.rpm

   openSUSE 10.2: ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/bind-9.3.5P1-0.1.i586.rpm ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/bind-chrootenv-9.3.5P1-0.1.i586.rpm ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/bind-devel-9.3.5P1-0.1.i586.rpm ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/bind-doc-9.3.5P1-0.1.i586.rpm ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/bind-libs-9.3.5P1-0.1.i586.rpm ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/bind-utils-9.3.5P1-0.1.i586.rpm

   x86-64 Platform:    

   openSUSE 11.0:
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/bind-libs-32bit-9.4.2-39.2.x86_64.rpm    

   openSUSE 10.3:
   http://download.opensuse.org/pub/opensuse/update/10.3/rpm/x86_64/bind-libs-32bit-9.4.1.P1-12.5.x86_64.rpm    

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/bind-libs-32bit-9.3.5P1-0.1.x86_64.rpm    

   Sources:    

   openSUSE 11.0:
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/bind-9.4.2-39.2.src.rpm    

   openSUSE 10.3:
   http://download.opensuse.org/pub/opensuse/update/10.3/rpm/src/bind-9.4.1.P1-12.5.src.rpm    

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/src/bind-9.3.5P1-0.1.src.rpm    

   Our maintenance customers are notified individually. The packages are    offered for installation from the maintenance web:    

   Open Enterprise Server
     http://support.novell.com/techcenter/psdb/aa846ea840c9bf29e6974f3b6913e550.html    

   Novell Linux POS 9
     http://support.novell.com/techcenter/psdb/aa846ea840c9bf29e6974f3b6913e550.html    

   Novell Linux Desktop 9
     http://support.novell.com/techcenter/psdb/aa846ea840c9bf29e6974f3b6913e550.html    

   SUSE SLES 9
     http://support.novell.com/techcenter/psdb/aa846ea840c9bf29e6974f3b6913e550.html    

   SUSE Linux Enterprise Server 10 SP1
     http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.html    

   SUSE Linux Enterprise Server 10 SP2
     http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.html    

   SLE SDK 10 SP2
     http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.html    

   SUSE Linux Enterprise 10 SP2 DEBUGINFO      http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.html    

   SLE SDK 10 SP1
     http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.html    

   SUSE Linux Enterprise Desktop 10 SP1
     http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.html    

   SUSE Linux Enterprise Desktop 10 SP2
     http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.html


5) Pending Vulnerabilities, Solutions, and Work-Arounds:

   none


6) Authenticity Verification and Additional Information

  • Announcement authenticity verification:

    SUSE security announcements are published via mailing lists and on Web     sites. The authenticity and integrity of a SUSE security announcement is     guaranteed by a cryptographic signature in each announcement. All SUSE     security announcements are published with a valid signature.

    To verify the signature of the announcement, save it as text into a file     and run the command

      gpg --verify <file>

    replacing <file> with the name of the file where you saved the     announcement. The output for a valid signature looks like: gpg: Signature made <DATE> using RSA key ID 3D25D3D9 gpg: Good signature from "SuSE Security Team <security@suse.de>"

    where <DATE> is replaced by the date the document was signed.

    If the security team's key is not contained in your key ring, you can     import it from the first installation CD. To import the key, use the     command

      gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

  • Package authenticity verification:

    SUSE update packages are available on many mirror FTP servers all over the     world. While this service is considered valuable and important to the free     and open source software community, the authenticity and the integrity of     a package needs to be verified to ensure that it has not been tampered     with.

    The internal 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, replacing <file.rpm> with the     filename of the RPM package downloaded. The package is unmodified if it     contains a valid signature from build@suse.de with the key ID 9C800ACA.

    This key is automatically imported into the RPM database (on     RPMv4-based distributions) and the gpg key ring of 'root' during     installation. You can also find it on the first installation CD and at     the end of this announcement.

  • SUSE runs two security mailing lists to which any interested party may subscribe:

    opensuse-security@opensuse.org

  • General Linux and SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an e-mail to <opensuse-security+subscribe@opensuse.org>.

    opensuse-security-announce@opensuse.org

  • SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an e-mail to <opensuse-security-announce+subscribe@opensuse.org>.

    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, the     clear text signature should show proof of the authenticity of the text.

    SUSE Linux Products GmbH provides 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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