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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.3602 PowerDNS Security Advisories 19 November 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: powerdns Publisher: PowerDNS Operating System: UNIX variants (UNIX, Linux, OSX) BSD variants Impact/Access: Provide Misleading Information -- Remote/Unauthenticated Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-14644 CVE-2018-14626 CVE-2018-10851 Original Bulletin: https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-07.html https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-06.html https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-04.html Comment: This bulletin contains three (3) PowerDNS security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- PowerDNS Security Advisory 2018-07: Crafted query for meta-types can cause a denial of service- o CVE: CVE-2018-14644 o Date: November 6th 2018 o Affects: PowerDNS Recursor from 4.0.0 up to and including 4.1.4 o Not affected: 4.0.9, 4.1.5 o Severity: Medium o Impact: Denial of service o Exploit: This problem can be triggered via crafted queries for some domains o Risk of system compromise: No o Solution: Upgrade to a non-affected version An issue has been found in PowerDNS Recursor where a remote attacker sending a DNS query for a meta-type like OPT can lead to a zone being wrongly cached as failing DNSSEC validation. It only arises if the parent zone is signed, and all the authoritative servers for that parent zone answer with FORMERR to a query for at least one of the meta-types. As a result, subsequent queries from clients requesting DNSSEC validation will be answered with a ServFail. This issue has been assigned CVE-2018-14644 by Red Hat. PowerDNS Recursor from 4.0.0 up to and including 4.1.4 is affected. We would like to thank Toshifumi Sakaguchi for finding and subsequently reporting this issue. - -------------------------------------------------------------------------------- PowerDNS Security Advisory 2018-06: Packet cache pollution via crafted query- o CVE: CVE-2018-14626 o Date: November 6th 2018 o Affects: PowerDNS Recursor from 4.0.0 up to and including 4.1.4 o Not affected: 4.1.5, 4.0.9 o Severity: Medium o Impact: Denial of service o Exploit: This problem can be triggered via crafted queries o Risk of system compromise: No o Solution: Upgrade to a non-affected version An issue has been found in PowerDNS Recursor allowing a remote user to craft a DNS query that will cause an answer without DNSSEC records to be inserted into the packet cache and be returned to clients asking for DNSSEC records, thus hiding the presence of DNSSEC signatures for a specific qname and qtype. For a DNSSEC-signed domain, this means that clients performing DNSSEC validation by themselves might consider the answer to be bogus until it expires from the packet cache, leading to a denial of service. This issue has been assigned CVE-2018-14626. PowerDNS Recursor from 4.0.0 up to and including 4.1.4 is affected. We would like to thank Kees Monshouwer for finding and subsequently reporting this issue. - -------------------------------------------------------------------------------- PowerDNS Security Advisory 2018-04: Crafted answer can cause a denial of service- o CVE: CVE-2018-10851 o Date: November 6th 2018 o Affects: PowerDNS Recursor from 3.2 up to and including 4.1.4 o Not affected: 4.1.5, 4.0.9 o Severity: Medium o Impact: Denial of service o Exploit: This problem can be triggered by an authoritative server o Risk of system compromise: No o Solution: Upgrade to a non-affected version o Workaround: run the process inside a supervisor An issue has been found in PowerDNS Recursor allowing a malicious authoritative server to cause a memory leak by sending specially crafted records. The issue is due to the fact that some memory is allocated before the parsing and is not always properly released if the record is malformed. This issue has been assigned CVE-2018-10851. When the PowerDNS Recursor is run inside a supervisor like supervisord or systemd, an out-of-memory crash will lead to an automatic restart, limiting the impact to a somewhat degraded service. PowerDNS Recursor from 3.2 up to and including 4.1.4 is affected. Please note that at the time of writing, PowerDNS Recursor 3.7 and below are no longer supported, as described in End of life statements. - --------------------------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 iQIVAwUBW/JUVGaOgq3Tt24GAQhDGA/9Fm8d71MCIK8nnyyTLvocnXG8GR7JOvIf L1pentk6ZDns2ccO5gHBzYGgnhWo91CHlVKiMeRyXrG3HV9zAODjn8X1wguyn70S THf/1HwMJ3TEEYAK4G/A89IgNm7YW/89Agtb7vuHbUUqPGBWMN8o1bVgmvcZYCdh JRjQF7TpiGWpDBeQXscom95/qquQSPlYbXcWYscve1HE4rysMhKq+6oNEjKzePBR HCQG4oFJsZkbgqkvN+PxrceDDC7KRPkcuUbuj0lRRqkeCC+CG/MgqRablTPwdz5z UQI9S6wrenog0SIcRQipCJzd/4zDOKr7qzDmEUSJXnbI6ju3ATMxHfUYfpMuHh/5 jb6oUozmjq76Dvchta8hytPEzzdXHpzjnTXsi5kct42Wle+lY2TH+CdSE9SWqvy2 iTjBTj7vitd1/EG+wHAIE8Er4F0PEtmj9D7uPVhnCaHYZUoaKjYka26g98imoyj2 z7tiHKESguYN9j29YaVtvWbPPJml5TzqY3EYQ65TULAy6vKWzF3W5cPd7xStl0W5 y/iC9xy1D0pNU7KHiLgz8xWtYuOTjtJTDIx9ZWyDLBddhPjllWMqXmEgWiUqU+IU CV1wvcwzqfoEA9qYlAyAway3kvBfDOsIyto0mI+bWrvGL3yEYwGyHMWuJ+V7FQc8 uEqDsuWNCKk= =1u2N -----END PGP SIGNATURE-----