-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ 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 for- warder 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 to apply the update, replacing 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... http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-chrooten... http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-devel-9.... http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-doc-9.4.... http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-libs-9.4... http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/bind-utils-9.... openSUSE 10.3: http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-9.4.1.P1... http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-chrooten... http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-devel-9.... http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-doc-9.4.... http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-libs-9.4... http://download.opensuse.org/pub/opensuse/update/10.3/rpm/i586/bind-utils-9.... 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-3... openSUSE 10.3: http://download.opensuse.org/pub/opensuse/update/10.3/rpm/x86_64/bind-libs-3... 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.... openSUSE 10.3: http://download.opensuse.org/pub/opensuse/update/10.3/rpm/src/bind-9.4.1.P1-... 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.h... Novell Linux POS 9 http://support.novell.com/techcenter/psdb/aa846ea840c9bf29e6974f3b6913e550.h... Novell Linux Desktop 9 http://support.novell.com/techcenter/psdb/aa846ea840c9bf29e6974f3b6913e550.h... SUSE SLES 9 http://support.novell.com/techcenter/psdb/aa846ea840c9bf29e6974f3b6913e550.h... SUSE Linux Enterprise Server 10 SP1 http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.h... SUSE Linux Enterprise Server 10 SP2 http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.h... SLE SDK 10 SP2 http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.h... SUSE Linux Enterprise 10 SP2 DEBUGINFO http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.h... SLE SDK 10 SP1 http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.h... SUSE Linux Enterprise Desktop 10 SP1 http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.h... SUSE Linux Enterprise Desktop 10 SP2 http://support.novell.com/techcenter/psdb/555065b7278085ce1ce7a6e84b6f07aa.h... ______________________________________________________________________________ 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 " 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 to verify the signature of the package, replacing 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-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 . ===================================================================== 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, 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. 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