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             AUSCERT External Security Bulletin Redistribution

                    PowerDNS Security Advisory 2018-09
                             10 December 2018


        AusCERT Security Bulletin Summary

Product:           PowerDNS
Publisher:         PowerDNS
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   BSD variants
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-16855  

Original Bulletin: 

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PowerDNS Security Advisory 2018-09: Crafted query can cause a denial of service

  * CVE: CVE-2018-16855
  * Date: 26th of November 2018
  * Affects: PowerDNS Recursor from 4.1.0 up to and including 4.1.7
  * Not affected: 4.0.x, 4.1.8
  * Severity: Medium
  * Impact: Denial of service
  * Exploit: This problem can be triggered via crafted queries
  * Risk of system compromise: No
  * Solution: Upgrade to a non-affected version

An issue has been found in PowerDNS Recursor where a remote attacker sending a
DNS query can trigger an out-of-bounds memory read while computing the hash of
the query for a packet cache lookup, possibly leading to a crash.

This issue has been assigned CVE-2018-16855 by Red Hat.

When the PowerDNS Recursor is run inside a supervisor like supervisord or
systemd, a crash will lead to an automatic restart, limiting the impact to a
somewhat degraded service.

PowerDNS Recursor from 4.1.0 up to and including 4.1.7 is affected.

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