Combining WAF and HSS to Get Improved Web Tamper Protection

WAF examines HTTP/HTTPS requests. If an attacker attempts to tamper with web pages using attacks like SQL injection, WAF can identify and block the attacks in a timely manner, so they cannot sneak into or change anything in the OSs of your web servers.

Even if attacks bypass the first layer of protection, HSS WTP provides multi-level defenses. HSS WTP protects files in the web file directories from any unauthorized access. Only your website administrator can update the website content through the privileged process. Apart from that, HSS WTP also backs up web file directories locally and remotely. Once a file is tampered with, it can be quickly restored with backups. For dynamic web pages such as applications on web servers, HSS WTP uses Runtime Application Self-Protection (RASP) to monitor application access. It can detect tampering on dynamic data such as databases and prevent attackers from using applications to tamper with web pages in real time.

With HSS and WAF in place, you can stop worrying about web page tampering.

What Web Tampering Is and Impacts of Web Tampering

Web tampering is a type of cyberattack that exploits vulnerabilities in web applications to tamper with web application content or to insert hidden links. Web tampering attacks are often used to spread malicious information, incite unrest, and steal money.

Links to pornographic or otherwise illegal content may be inserted into normal web pages. Tampered web pages can permanently damage the brand image of your organization.

Differences Between The Web Tamper Protection Functions of HSS and WAF

**Table 1** Differences between the web tamper protection functions of HSS and WAF
Type	HSS	WAF
Static web pages	Locks files in driver and web file directories to prevent attackers from tampering with them.	Caches static web pages on servers.
Dynamic web pages	Dynamic WTP Protects your data while Tomcat is running, detecting dynamic data tampering in databases. Privileged process management Allows only privileged processes to modify web pages.	Not supported
Backup and restoration	Proactive backup and restoration If WTP detects that a file in the protection directory is tampered with, it immediately uses the backup file on the local server to restore the file. Remote backup and restoration If a file directory or backup directory on the local server becomes invalid, you can use the remote backup service to restore the tampered web page.	Not supported
Protection object	Web tamper prevention. This function is suitable for websites that have high protection requirements.	Websites that only require application-layer protection

Configuring a Web Tamper Protection Rule in WAF

Log in to the management console.
Click in the upper left corner of the management console and select a region or project.
Click in the upper left corner and choose Web Application Firewall (Dedicated) under Security.
In the navigation pane on the left, choose Policies.
Click the name of the target policy to go to the protection configuration page.
In the Web Tamper Protection configuration area, change Status if needed and click Customize Rule to go to the Web Tamper Protection page.
In the upper left corner above the Web Tamper Protection rule list, click Add Rule.

In the displayed dialog box, specify the parameters by referring to Table 2.

**Table 2** Rule parameters
Parameter	Description	Example Value
Domain Name	Domain name of the website to be protected	www.example.com
Path	A part of the URL, not including the domain name A URL is used to define the address of a web page. The basic URL format is as follows: Protocol name://Domain name or IP address[:Port]/[Path/.../File name]. For example, if the URL is http://www.example.com/admin, set Path to /admin. NOTE: The path does not support regular expressions. The path cannot contain two or more consecutive slashes. For example, ///admin. If you enter ///admin, WAF converts /// to /.	/admin
Rule Description	A brief description of the rule. This parameter is optional.	None

Click Confirm. You can view the rule in the list of web tamper protection rules.

Enabling HSS Web Tamper Protection

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In the navigation pane, choose Prevention > Web Tamper Protection. On the Web Tamper Protection page, click Add Server.
On the Add Server page, click the Available servers tab. Select the target server, select a quota from the drop-down list or retain the default value, and click Add and Enable Protection.
View the server status on the Web Tamper Protection page.

The premium edition will be enabled when you enable WTP.
- Choose Prevention > Web Tamper Protection. If the Protection Status of the server is Protected, WTP has been enabled.

Before disabling WTP, perform a comprehensive detection on the server, handle known risks, and record operation information to prevent O&M errors and attacks on the server.
If WTP is disabled, web applications are more likely to be tampered with. Therefore, you need to delete important data on the server, stop important services on the server, and disconnect the server from the external network in a timely manner to avoid unnecessary losses caused by attacks on the server.
After you or disable WTP, files in the protected directory are no longer protected. You are advised to process files in the protected directory before performing these operations.
If you find some files missing after disabling WTP, search for them in the local or remote backup path.