#VU33708 Input validation error in Dnsmasq - CVE-2017-15107

Vulnerability identifier: #VU33708

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-15107

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Dnsmasq
Server applications / DNS servers

Vendor: GNU

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

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

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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.