An issue has been found in PowerDNS Recursor versions after 4.1.3 before 4.1.9 where Lua hooks are not properly applied to queries received over TCP in some specific combination of settings, possibly bypassing security policies enforced using Lua.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue has been found in PowerDNS Recursor versions after 4.1.3 before 4.1.9 where Lua hooks are not     properly applied to queries received over TCP in some specific combination of settings, possibly bypassing     security policies enforced using Lua. (CVE-2019-3806)

Note that Nessus relies on the presence of the package as reported by the vendor.

Fixes CVE-2019-386 and CVE-2019-3807

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

PowerDNS Team reports :

CVE-2019-3806: An issue has been found in PowerDNS Recursor where Lua hooks are not properly applied to queries received over TCP in some specific combination of settings, possibly bypassing security policies enforced using Lua.

When the recursor is configured to run with more than one thread (threads=X) and to do the distribution of incoming queries to the worker threads itself (pdns-distributes-queries=yes), the Lua script is not properly loaded in the thread handling incoming TCP queries, causing the Lua hooks to not be properly applied.

CVE-2019-3807: An issue has been found in PowerDNS Recursor where records in the answer section of responses received from authoritative servers with the AA flag not set were not properly validated, allowing an attacker to bypass DNSSEC validation.

ID	Name	Product	Family	Severity
248878	Linux Distros Unpatched Vulnerability : CVE-2019-3806	Nessus	Misc.	high
122138	Fedora 29 : pdns-recursor (2019-f44f095639)	Nessus	Fedora Local Security Checks	critical
122136	Fedora 28 : pdns-recursor (2019-7696bb57ca)	Nessus	Fedora Local Security Checks	critical
121427	FreeBSD : powerdns-recursor -- multiple vulnerabilities (40d92cc5-1e2b-11e9-bef6-6805ca2fa271)	Nessus	FreeBSD Local Security Checks	critical

Detections

Analytics

CVE-2019-3806

high

Tenable Plugins

high

critical

critical

critical