DNS records smuggling in PowerDNS DNSDist

1) Input validation error

EUVDB-ID: #VU77909

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-14663

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing DNS queries. A remote attacker can smuggle certain DNS records into the DNS backend and perform spoofing attack. This issue occurs only when either the ‘useClientSubnet’ or the experimental ‘addXPF’ parameters are used when declaring a new backend.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

dnsdist: 1.0.0 - 1.3.2

CPE2.3

• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.2.0:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14663
https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2018-08.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.