Knot DNS up to 2.2.x Zone Transfer resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.8$0-$5k0.00

A vulnerability was found in Knot DNS up to 2.2.x and classified as problematic. Affected by this issue is an unknown part of the component Zone Transfer Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.

The bug was discovered 07/06/2016. The weakness was shared 02/09/2017 (Website). The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2016-6171 since 07/06/2016. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability was handled as a non-public zero-day exploit for at least 44 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 93055 (Fedora 24 : knot (2016-3479f8e060)), 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.

Upgrading to version 2.3.0 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 (93055) and SecurityFocus (BID 91678†). The entries VDB-88750, VDB-88751, VDB-88752 and VDB-92197 are related to this item. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.6
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 93055
Nessus Name: Fedora 24 : knot (2016-3479f8e060)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 803374
OpenVAS Name: Knot DNS Server AXFR Response Denial of Service Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Knot DNS 2.3.0

Timelineinfo

07/06/2016 🔍
07/06/2016 +0 days 🔍
07/07/2016 +1 days 🔍
08/19/2016 +43 days 🔍
08/22/2016 +3 days 🔍
02/09/2017 +171 days 🔍
02/09/2017 +0 days 🔍
02/09/2017 +0 days 🔍
11/12/2022 +2102 days 🔍

Sourcesinfo

Advisory: FEDORA-2016-3479f8e060
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-6171 (🔍)
GCVE (CVE): GCVE-0-2016-6171
GCVE (VulDB): GCVE-100-96764
SecurityFocus: 91678 - Multiple DNS Servers Remote Denial of Service Vulnerability
OSVDB: - CVE-2016-6171 - Knot DNS - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 02/09/2017 07:32 PM
Updated: 11/12/2022 01:58 PM
Changes: 02/09/2017 07:32 PM (61), 08/12/2020 08:55 PM (7), 11/12/2022 01:46 PM (3), 11/12/2022 01:53 PM (11), 11/12/2022 01:58 PM (1)
Complete: 🔍
Cache ID: 18:619:40

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