Unbound up to 1.6.7 NSEC Record Wildcard input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Unbound up to 1.6.7. This issue affects some unknown processing of the component NSEC Record Handler. Executing a manipulation as part of Wildcard can lead to input validation. This vulnerability is handled as CVE-2017-15105. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Unbound up to 1.6.7. It has been declared as critical. This vulnerability affects an unknown function of the component NSEC Record Handler. The manipulation as part of a Wildcard leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 01/19/2018. The weakness was released 01/23/2018 (Website). The advisory is shared for download at unbound.net. This vulnerability was named CVE-2017-15105 since 10/08/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 106214 (FreeBSD : unbound -- vulnerability in the processing of wildcard synthesized NSEC records (8d3bae09-fd28-11e7-95f2-005056925db4)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176671 (Debian Security Update for unbound (DLA 1676-1)).

Upgrading to version 1.6.8 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106214) and SecurityFocus (BID 102817†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 106214
Nessus Name: FreeBSD : unbound -- vulnerability in the processing of wildcard synthesized NSEC records (8d3bae09-fd28-11e7-95f2-005056925db4)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 860808
OpenVAS Name: Unbound DNS Resolver Denial of Service Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Unbound 1.6.8

Timelineinfo

10/08/2017 🔍
01/19/2018 +103 days 🔍
01/19/2018 +0 days 🔍
01/19/2018 +0 days 🔍
01/22/2018 +3 days 🔍
01/23/2018 +1 days 🔍
01/23/2018 +0 days 🔍
01/24/2018 +1 days 🔍
02/02/2023 +1835 days 🔍

Sourcesinfo

Advisory: USN-3673-1
Researcher: Ralph Dolmans, Karst Koymans
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-15105 (🔍)
GCVE (CVE): GCVE-0-2017-15105
GCVE (VulDB): GCVE-100-112336
SecurityFocus: 102817 - Unbound CVE-2017-15105 Security Bypass Vulnerability

Entryinfo

Created: 01/24/2018 07:59
Updated: 02/02/2023 13:21
Changes: 01/24/2018 07:59 (57), 12/27/2019 07:28 (11), 02/01/2021 14:44 (12), 02/01/2021 14:48 (1), 02/02/2023 13:21 (3)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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