VDB-112337 · CVE-2017-15107 · Nessus 106640

Dnsmasq 2.78 DNSSEC Wildcard access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Dnsmasq 2.78. Impacted is an unknown function of the component DNSSEC. The manipulation as part of Wildcard leads to access control. This vulnerability is uniquely identified as CVE-2017-15107. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Dnsmasq 2.78 (Domain Name Software). It has been rated as critical. This issue affects an unknown functionality of the component DNSSEC. The manipulation as part of a Wildcard leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 01/19/2018. The weakness was disclosed 01/23/2018 (Website). The advisory is shared at lists.thekelleys.org.uk. The identification of this vulnerability is CVE-2017-15107 since 10/08/2017. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 106640 (Fedora 26 : dnsmasq (2018-9780220f7d)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277128 (Fedora Security Update for dnsmasq (FEDORA-2018-9780220f7d)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106640) and SecurityFocus (BID 102812†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Domain Name Software

Name

Dnsmasq

Version

2.78

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Nessus ID: 106640
Nessus Name: Fedora 26 : dnsmasq (2018-9780220f7d)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800056
OpenVAS Name: Dnsmasq DNSSEC Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

10/08/2017 🔍
01/19/2018 +102 days 🔍
01/19/2018 +0 days 🔍
01/23/2018 +4 days 🔍
01/23/2018 +0 days 🔍
01/24/2018 +1 days 🔍
02/06/2018 +13 days 🔍
02/07/2018 +1 days 🔍
02/02/2023 +1821 days 🔍

Sourcesinfo

Advisory: FEDORA-2018-9780220f7d
Researcher: Ralph Dolmans
Status: Not defined

CVE: CVE-2017-15107 (🔍)
GCVE (CVE): GCVE-0-2017-15107
GCVE (VulDB): GCVE-100-112337
SecurityFocus: 102812

Entryinfo

Created: 01/24/2018 07:59
Updated: 02/02/2023 13:27
Changes: 01/24/2018 07:59 (73), 12/27/2019 07:43 (3), 02/01/2021 14:51 (4), 02/02/2023 13:27 (3)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.