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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1710 Unbound vulnerability 8 June 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: unbound Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-15105 Reference: ESB-2018.0218 Original Bulletin: http://www.ubuntu.com/usn/usn-3673-1 - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3673-1 June 07, 2018 unbound vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 18.04 LTS - - Ubuntu 17.10 - - Ubuntu 16.04 LTS - - Ubuntu 14.04 LTS Summary: A security issue was fixed in Unbound. Software Description: - - unbound: validating, recursive, caching DNS resolver Details: Ralph Dolmans and Karst Koymans discovered that Unbound did not properly handle certain NSEC records. An attacker could use this to to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick Unbound into accepting a NODATA proof. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: libunbound2 1.6.7-1ubuntu2.1 unbound 1.6.7-1ubuntu2.1 Ubuntu 17.10: libunbound2 1.6.5-1ubuntu0.2 unbound 1.6.5-1ubuntu0.2 Ubuntu 16.04 LTS: libunbound2 1.5.8-1ubuntu1.1 unbound 1.5.8-1ubuntu1.1 Ubuntu 14.04 LTS: libunbound2 1.4.22-1ubuntu4.14.04.3 unbound 1.4.22-1ubuntu4.14.04.3 In general, a standard system update will make all the necessary changes. References: https://usn.ubuntu.com/usn/usn-3673-1 CVE-2017-15105 Package Information: https://launchpad.net/ubuntu/+source/unbound/1.6.7-1ubuntu2.1 https://launchpad.net/ubuntu/+source/unbound/1.6.5-1ubuntu0.2 https://launchpad.net/ubuntu/+source/unbound/1.5.8-1ubuntu1.1 https://launchpad.net/ubuntu/+source/unbound/1.4.22-1ubuntu4.14.04.3 - --------------------------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: https://www.auscert.org.au/bulletins/ =========================================================================== 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 iQIVAwUBWxnNMmaOgq3Tt24GAQjodA/9EoK2e+3EWW2mohXVayCfkIcMzJmW1/Hl sUWHF/UHvymuH3APZjMfSe3tZoJpW2C5OIqAy7MQoyCMYNdLdu6cvJaEtqlUfdTN 6AeWBnNctPIjYQg1XE46tgoVfF1x1xpJldmOSDrPzsT9J/dKE1fz6dAt/vZ6hyrz X8g2oVlvGgIArANPKE38zQg7BPieUQspRMTW8ZeN0ffoRKAeqcW9+RAt5BOHYTHK 3f2eXBXCpyarIAZZCSbllWIl3krn2fuQFh3NZMFqbVXpuZk06U3R21Au9hjYuLhO i7hOv5g2SAXZjdszmNORwAjOgzsDQCwe8zdnXj7rJUxxnM34W1J4BcXoNihR6j5C piTIyTnrIzBuZUxDU5E5BAHbFjjhhN2yrtsvioMBVPxKRoZwPuBzXPDOP0U4eM9N CZZhro8VvLR9dx0dnLEmYVhROE4wzbxVXca+ztTLapeW7FTgqaZC9nuD5fYgGLfx +l8fo54xrm2d+WKOrWRZztlP7XremWAPZM4evrS36hvI4NeWkhaQr4CZp1+lftXa Z25izvQl4usMqncqDXUG5d2E4Djl2DqwR8cvfFdXRpz3S6jTFnSLwQ/7olbJQa2f mhZEFpUZ/ChLj9HTQvs2kK6JSZ6kfZOQTTb5TDsL4BW1XrQGnredyrneiBk0eCjC t3HdXsh/740= =xjOp -----END PGP SIGNATURE-----