Using LTS to Analyze How WAF Blocks Spring Core RCE Vulnerabilities

Application Scenarios

After you authorize WAF to access Log Tank Service (LTS), you can use the attack logs recorded by LTS for quick and efficient real-time analysis, device O&M management, and analysis of service trends.

This topic walks you through on how to enable the LTS quick analysis for WAF attack logs and use the Spring rule ID to quickly query and analyze the logs of the blocked Spring Core RCE vulnerabilities.

Resource and Cost Planning

Step 1: Buy the Standard Edition Cloud WAF

The following describes how to buy the standard edition cloud WAF.

1. Log in to Huawei Cloud management console.
2. On the management console page, choose Security & Compliance > Web Application Firewall.
3. In the upper right corner of the page, click Buy WAF. On the purchase page displayed, select Cloud Mode for WAF Mode.
   • Region: Select the region nearest to your services WAF will protect.
   • Edition: Select Standard.
   • Expansion Package and Required Duration: Set them based on site requirements.

4. Confirm the product details and click Buy Now in the lower right corner of the page.
5. Check the order details and read the WAF Disclaimer. Then, select the box and click Pay Now.
6. On the payment page, select a payment method and pay for your order.

Step 2: Add Website Information to WAF

The following example shows how to add a website information to WAF in cloud CNAME access mode.

• For details about the cloud load balancer access mode, see Connecting a Website to WAF (Cloud Mode - ELB Access).
• For details about the dedicated mode, see Connecting a Website to WAF (Dedicated Mode).

1. In the navigation pane on the left, choose Website Settings.
2. In the upper left corner of the website list, click Add Website.
3. Select Cloud - CNAME and click Configure Now.
4. Configure website information as prompted.
   Figure 1 Configuring basic information
   

   Table 2 Key parameters

   Parameter	Description	Example Value
   Domain Name	Domain name you want to add to WAF for protection. The domain name has an ICP license. You can enter a single domain name (for example, top-level domain name example.com or level-2 domain name www.example.com) or a wildcard domain name (*.example.com).	www.example.com
   Protected Port	The port over which the website traffic goes	Standard ports
   Server Configuration	Web server address settings. You need to configure the client protocol, server protocol, server weights, server address, and server port. Client Protocol: protocol used by a client to access a server. The options are HTTP and HTTPS. Server Protocol: protocol used by WAF to forward client requests. The options are HTTP and HTTPS. Server Address: public IP address (generally corresponding to the A record of the domain name configured on the DNS) or domain name (generally corresponding to the CNAME record of the domain name configured on the DNS) of the web server that a client accesses. Server Port: service port over which the WAF instance forwards client requests to the origin server. Weight: Requests are distributed across backend origin servers based on the load balancing algorithm you select and the weight you assign to each server.	Client Protocol: Select HTTP. Server Protocol: HTTP Server Address: IPv4 XXX.XXX.1.1 Server Port: 80
   Use Layer-7 Proxy	You need to configure whether you deploy layer-7 proxies in front of WAF. Set this parameter based on your website deployment.	Yes

5. Click Next. Then, whitelist WAF back-to-source IP address, test WAF, and modify DNS records as prompted.
   Figure 2 Domain name added to WAF
   

Step 3: Enable LTS for Protection Logs

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. Click in the upper left corner and choose Web Application Firewall under Security & Compliance.
4. In the navigation pane on the left, choose Events.
5. Click the Log Settings tab, enable LTS (), and select a log group and log stream. Table 3 describes the parameters.
   Figure 3 Log settings
   

   Table 3 Log configuration

   Parameter	Description	Example Value
   Log Group	Select a log group or click View Log Group to go to the LTS console and create a log group.	lts-group-waf
   Attack Log	Select a log stream or click View Log Stream to go to the LTS console and create a log stream. An attack log includes information about event type, protective action, and attack source IP address of each attack.	lts-topic-waf-attack
   Access Log	Select a log stream or click View Log Stream to go to the LTS console and create a log stream. An access log includes key information about access time, client IP address, and resource URL of each HTTP access requests.	lts-topic-waf-access

6. Click OK.

   You can view WAF protection event logs on the LTS console.

Step 4: Use LTS to Analyze How WAF Blocks Spring Core RCE Vulnerabilities

1. Click in the upper left corner of the page and choose Management & Governance > Log Tank Service.
2. In the log group list, expand the WAF log group and choose log stream attack.
3. On the log stream details page, click in the upper right corner. On the page displayed, click the Cloud Structured Parsing tab.
4. Select JSON for log structuring. Then, click Select from existing events and select a log in the dialog box displayed on the right.
5. Click Intelligent Extraction to find the fields you want to analyze quickly. Enable these fields in the Quick Analysis column. After this, you can collect and analyze periodic logs.
   Figure 4 Log extraction field
   

6. Find the category field, click in the Alias column, change the field name, and click to save the settings.
   

   There is already a built-in category field in the system so you need to change the alias name of the category field, or your settings cannot be saved.

7. In the lower right corner of the list, click Save. LTS quickly analyzes and collects statistics on logs in the specified period.
8. In the navigation pane on the left, choose Visualization. Enter the following command and click Query to view the logs of the blocked Spring core RCE vulnerability.

   select rule, hit_data where rule IN('XX','XX','XX','XX',)

   Figure 5 Visualization query