Compute
Elastic Cloud Server
Huawei Cloud Flexus
Bare Metal Server
Auto Scaling
Image Management Service
Dedicated Host
FunctionGraph
Cloud Phone Host
Huawei Cloud EulerOS
Networking
Virtual Private Cloud
Elastic IP
Elastic Load Balance
NAT Gateway
Direct Connect
Virtual Private Network
VPC Endpoint
Cloud Connect
Enterprise Router
Enterprise Switch
Global Accelerator
Management & Governance
Cloud Eye
Identity and Access Management
Cloud Trace Service
Resource Formation Service
Tag Management Service
Log Tank Service
Config
OneAccess
Resource Access Manager
Simple Message Notification
Application Performance Management
Application Operations Management
Organizations
Optimization Advisor
IAM Identity Center
Cloud Operations Center
Resource Governance Center
Migration
Server Migration Service
Object Storage Migration Service
Cloud Data Migration
Migration Center
Cloud Ecosystem
KooGallery
Partner Center
User Support
My Account
Billing Center
Cost Center
Resource Center
Enterprise Management
Service Tickets
HUAWEI CLOUD (International) FAQs
ICP Filing
Support Plans
My Credentials
Customer Operation Capabilities
Partner Support Plans
Professional Services
Analytics
MapReduce Service
Data Lake Insight
CloudTable Service
Cloud Search Service
Data Lake Visualization
Data Ingestion Service
GaussDB(DWS)
DataArts Studio
Data Lake Factory
DataArts Lake Formation
IoT
IoT Device Access
Others
Product Pricing Details
System Permissions
Console Quick Start
Common FAQs
Instructions for Associating with a HUAWEI CLOUD Partner
Message Center
Security & Compliance
Security Technologies and Applications
Web Application Firewall
Host Security Service
Cloud Firewall
SecMaster
Anti-DDoS Service
Data Encryption Workshop
Database Security Service
Cloud Bastion Host
Data Security Center
Cloud Certificate Manager
Edge Security
Situation Awareness
Managed Threat Detection
Blockchain
Blockchain Service
Web3 Node Engine Service
Media Services
Media Processing Center
Video On Demand
Live
SparkRTC
MetaStudio
Storage
Object Storage Service
Elastic Volume Service
Cloud Backup and Recovery
Storage Disaster Recovery Service
Scalable File Service Turbo
Scalable File Service
Volume Backup Service
Cloud Server Backup Service
Data Express Service
Dedicated Distributed Storage Service
Containers
Cloud Container Engine
SoftWare Repository for Container
Application Service Mesh
Ubiquitous Cloud Native Service
Cloud Container Instance
Databases
Relational Database Service
Document Database Service
Data Admin Service
Data Replication Service
GeminiDB
GaussDB
Distributed Database Middleware
Database and Application Migration UGO
TaurusDB
Middleware
Distributed Cache Service
API Gateway
Distributed Message Service for Kafka
Distributed Message Service for RabbitMQ
Distributed Message Service for RocketMQ
Cloud Service Engine
Multi-Site High Availability Service
EventGrid
Dedicated Cloud
Dedicated Computing Cluster
Business Applications
Workspace
ROMA Connect
Message & SMS
Domain Name Service
Edge Data Center Management
Meeting
AI
Face Recognition Service
Graph Engine Service
Content Moderation
Image Recognition
Optical Character Recognition
ModelArts
ImageSearch
Conversational Bot Service
Speech Interaction Service
Huawei HiLens
Video Intelligent Analysis Service
Developer Tools
SDK Developer Guide
API Request Signing Guide
Terraform
Koo Command Line Interface
Content Delivery & Edge Computing
Content Delivery Network
Intelligent EdgeFabric
CloudPond
Intelligent EdgeCloud
Solutions
SAP Cloud
High Performance Computing
Developer Services
ServiceStage
CodeArts
CodeArts PerfTest
CodeArts Req
CodeArts Pipeline
CodeArts Build
CodeArts Deploy
CodeArts Artifact
CodeArts TestPlan
CodeArts Check
CodeArts Repo
Cloud Application Engine
MacroVerse aPaaS
KooMessage
KooPhone
KooDrive
Help Center/ Cloud Firewall/ Best Practices/ Using CFW to Defend Against Network Attacks/ Using CFW to Defend Against Suspicious DNS Activities

Using CFW to Defend Against Suspicious DNS Activities

Updated on 2025-01-23 GMT+08:00

You can use CFW to defend against suspicious DNS activities.

Application Scenarios

DNS is a basic and important part of most Internet requests. Once the DNS system is attacked, network services will be severely affected. Therefore, it is important to ensure DNS security. CFW provides intrusion prevention rules for detecting suspicious DNS activities. When CFW detects suspicious DNS activity intrusions, it can block intrusion activities and attack traffic in real time.

What Is a Suspicious DNS Activity?

A domain name system (DNS) is a query and conversion system used to convert domain names into IP addresses for computer connections. When a user enters the domain name of a website in the browser, the browser sends a domain name resolution request to the DNS server. The DNS server returns the IP address corresponding to the domain name. The user can obtain the corresponding website resource based on the IP address.

Suspicious DNS activities refer to abnormal DNS requests or responses over the network. Attackers exploit DNS defects or send excessive requests to attack DNS. As a result, the DNS sends abnormal requests or responses, causing domain name resolution errors, resolution timeout, or DNS breakdown. This affects user experience and may also bring serious consequences such as economic losses and even legal liabilities.

Common Suspicious DNS Activities and Their Harms

Common suspicious DNS activities and their impacts include but are not limited to the following:
  • DNS cache poisoning: An attacker exploits the vulnerabilities of a DNS server to take over the DNS server. By tampering with the cache of the DNS server, the attacker redirects user access to malicious websites and launches attacks such as phishing and malware download.
  • DNS buffer overflow: An attacker exploits the vulnerabilities of the DNS server to send a large amount of malicious data to the cache of the server. As a result, the cache overflows and the malicious data overwrites the original valid data, causing attacks such as DNS response tampering, traffic redirection, and man-in-the-middle attacks.

How to Defend Against Suspicious DNS Activities

  1. Log in to the management console.
  2. Click in the upper left corner of the management console and select a region or project.
  3. In the navigation pane on the left, click and choose Security & Compliance > Cloud Firewall. The Dashboard page will be displayed.
  4. (Optional) Switch to another firewall instance: Select a firewall from the drop-down list in the upper left corner of the page.
  5. Click View Effective Rules under Basic Protection. The Basic Protection tab is displayed.
  6. Filter the rules for defending against suspicious DNS activities. In the filter above the list, select Suspicious-DNS-Activity from the Attack Types drop-down list.
  7. Enable protection in batches. Select multiple rules at a time and click Intercept.

    NOTE:

    Intercept: The firewall records the traffic that matches the current rule in attack event logs and blocks the traffic.

We use cookies to improve our site and your experience. By continuing to browse our site you accept our cookie policy. Find out more

Feedback

Feedback

Feedback

0/500

Selected Content

Submit selected content with the feedback