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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0821 -- [Win][UNIX/Linux] PowerDNS Recursor: DNS Cache Poisoning 22 August 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: PowerDNS Recursor 3.1.5 and earlier Publisher: Gentoo Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact: Provide Misleading Information Access: Remote/Unauthenticated CVE Names: CVE-2008-3217 CVE-2008-1637 Ref: AA-2008.0075 - --------------------------BEGIN INCLUDED TEXT-------------------- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory [UPDATE] GLSA 200804-22:03 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: PowerDNS Recursor: DNS Cache Poisoning Date: April 18, 2008 Updated: August 21, 2008 Bugs: #215567, #231335 ID: 200804-22:03 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Update ====== The previous version of the PowerDNS Recursor (3.1.5) did not properly address the issue, as UDP source port selection was insufficiently randomized. We advise all users to upgrade to 3.1.6. The updated sections appear below. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/pdns-recursor < 3.1.6 >= 3.1.6 Description =========== Amit Klein of Trusteer reported that insufficient randomness is used to calculate the TRXID values and the UDP source port numbers (CVE-2008-1637). Thomas Biege of SUSE pointed out that a prior fix to resolve this issue was incomplete, as it did not always enable the stronger random number generator for source port selection (CVE-2008-3217). Impact ====== A remote attacker could send malicious answers to insert arbitrary DNS data into the cache. These attacks would in turn help an attacker to perform man-in-the-middle and site impersonation attacks. Resolution ========== All PowerDNS Recursor users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/pdns-recursor-3.1.6" References ========== [ 1 ] CVE-2008-1637 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1637 [ 2 ] CVE-2008-3217 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3217 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200804-22.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2008 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBSK4zNyh9+71yA2DNAQKYCQP/XlUzvHsudw/mNjsVXjxlGRUslMjrZtks 4p/FxK1+J5Gp1GRTNnlbPOsKOkv63yOqv2Gn4a9Vz4nEQYW0wj5ihCEVKE27+TIe vXIDvnZdTBTKSRrk7uSVxFEuLcU3Cy4uMOx8xuj4f1TFdflMdln+ki5Ej/RbVQ9M ZC2pQMbo1rk= =0FFl -----END PGP SIGNATURE-----