#VU17347 Security restrictions bypass in PowerDNS Recursor - CVE-2019-3806

Vulnerability identifier: #VU17347

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

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

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

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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.