Vulnerability identifier: #VU17347

Vulnerability risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3806

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS Recursor
Server applications / DNS servers

Vendor: PowerDNS.COM B.V.

Description

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to Lua hooks are not properly applied to queries received over TCP in some specific combination of settings. A remote attacker can bypass security policies enforced using Lua.

Mitigation
Update to version 4.1.9.

Vulnerable software versions

PowerDNS Recursor: 4.1.4 - 4.1.8

---

External links
http://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2019-01.html

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.