-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SUSE Security Announcement Package: ntp Announcement-ID: SUSE-SA:2014:001 Date: Monday, Jan 20 15:13:37 CET 2014 Affected products: all NTP server installations Vulnerability Type: DDoS reflection attacks Severity (1-10): 7 SUSE default package: no Cross References: CVE-2013-5211 Content of this advisory: 1) security vulnerability resolved: - DDoS reflection attacks in ntpd problem description 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: - none 6) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion The "monlist" command of the NTP protocol is currently abused in a DDoS reflection attack. This is done by spoofing packets from addresses to which the attack is directed to. The ntp installations itself are not target of the attack, but they are part of the DDoS network which the attacker is driving. It is therefore necessary to restrict ntp configurations to not answer spoofed "monlist" requests. It is not necessary to update the ntp software itself. Additional information can be found here: https://www.cert-bund.de/advisoryshort/CB-K14-0020%20UPDATE%202 http://www.kb.cert.org/vuls/id/348126 A more comprehensive description on how you can secure your infrastructure against NTP DDoS reflection attacks can be found here: http://www.team-cymru.org/ReadingRoom/Templates/secure-ntp-template.html 2) solution/workaround To ensure that your ntpd installation can not participate in a DDoS attack, add the following line to your configuration: restrict default noquery 3) special instructions and notes After applying the configuration changes, restart the ntp daemon. 4) package location and checksums not applicable ______________________________________________________________________________ 5) Pending vulnerabilities in SUSE Distributions and Workarounds: none ______________________________________________________________________________ 6) 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 security@suse.de), the checksums show proof of the authenticity of the package. We recommend against subscribing to security lists that cause the e-mail 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 file name 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 "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-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 . 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. 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