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AUSCERT External Security Bulletin Redistribution
ESB-2018.3805
PowerDNS Security Advisory 2018-09
10 December 2018
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AusCERT Security Bulletin Summary
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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:
https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-09.html
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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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