ESB-2018.3602 - [UNIX/Linux][BSD] powerdns: Multiple vulnerabilities 2018-11-19

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3602
                       PowerDNS Security Advisories
                             19 November 2018

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        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.

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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.

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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.

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