ISC BIND up to 9.15.4 QNAME assertion

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in ISC BIND up to 9.15.4. Affected by this vulnerability is an unknown functionality of the component QNAME Handler. The manipulation results in assertion. This vulnerability is known as CVE-2019-6476. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in ISC BIND up to 9.15.4 (Domain Name Software). It has been classified as problematic. Affected is some unknown functionality of the component QNAME Handler. The manipulation with an unknown input leads to a assertion vulnerability. CWE is classifying the issue as CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. This is going to have an impact on availability. CVE summarizes:

A defect in code added to support QNAME minimization can cause named to exit with an assertion failure if a forwarder returns a referral rather than resolving the query. This affects BIND versions 9.14.0 up to 9.14.6, and 9.15.0 up to 9.15.4.

The weakness was published 10/17/2019 (Website). The advisory is shared for download at kb.isc.org. This vulnerability is traded as CVE-2019-6476. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The advisory points out:

A defect in code added to support QNAME minimization can cause named to exit with an assertion failure if a forwarder returns a referral rather than resolving the query.

The advisory illustrates:

An attacker who manages to deliberately trigger this condition on a server which is performing recursion can cause named to exit, denying service to clients.

Upgrading to version 9.14.7 or 9.15.5 eliminates this vulnerability. The advisory contains the following remark:

Servers which have QNAME minimization turned on are potentially vulnerable to this defect if they are running an affected version of BIND. The vulnerability can be avoided by disabling QNAME minimization using "qname-minimization disabled;" in the global options section of named.conf (Note: the default value for the qname-minimization setting in the 9.14 and 9.15 branches is "relaxed". To make use of this workaround it must be explicitly disabled.)

Similar entry is available at VDB-143879. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (ISC): 5.9
Vendor Vector (ISC): 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 5.9
CNA Vector (Internet Systems Consortium (ISC)): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Assertion
CWE: CWE-617
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: BIND 9.14.7/9.15.5

Timelineinfo

01/16/2019 🔍
10/17/2019 +274 days 🔍
10/18/2019 +1 days 🔍
01/16/2024 +1551 days 🔍

Sourcesinfo

Vendor: isc.org

Advisory: K42238532
Status: Not defined

CVE: CVE-2019-6476 (🔍)
GCVE (CVE): GCVE-0-2019-6476
GCVE (VulDB): GCVE-100-143880
See also: 🔍

Entryinfo

Created: 10/18/2019 10:40
Updated: 01/16/2024 14:58
Changes: 10/18/2019 10:40 (53), 10/18/2019 10:45 (17), 01/16/2024 14:54 (5), 01/16/2024 14:58 (10)
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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