Input validation error in GNU Dnsmasq

1) Input validation error

EUVDB-ID: #VU33708

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-15107

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

A vulnerability was found in the implementation of DNSSEC in Dnsmasq up to and including 2.78. Wildcard synthesized NSEC records could be improperly interpreted to prove the non-existence of hostnames that actually exist.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Dnsmasq: 2.0 - 2.78

External links

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00027.html
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2018q1/011896.html
http://www.securityfocus.com/bid/102812

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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