Input validation error in Unbound



Published: 2018-01-23 | Updated: 2020-07-17
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-15105
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
Unbound
Server applications / DNS servers

Vendor NLnet Labs

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU31359

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-15105

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

A flaw was found in the way unbound before 1.6.8 validated wildcard-synthesized NSEC records. An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Unbound: 1.6.0 - 1.6.7 rc1

External links

http://www.securityfocus.com/bid/102817
http://lists.debian.org/debian-lts-announce/2018/01/msg00039.html
http://lists.debian.org/debian-lts-announce/2019/02/msg00022.html
http://unbound.net/downloads/CVE-2017-15105.txt
http://usn.ubuntu.com/3673-1/


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.



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