Frequent security vulnerabilities in CMS systems, how can enterprises respond to large-scale attacks?
What are the security threats facing CMS systems and how should enterprises protect themselves? The public announcement by the security agency is quite straightforward: Large-scale exploitation activities targeting content management systems cover more than a dozen platforms and extension components, with attack vectors concentrated on unauthorized file upload and remote code execution, affecting common systems such as WordPress, Joomla, and so on, and corresponding patches have already been provided, requiring that they be installed as soon as possible. The characteristics of these activities are not targeted at a single enterprise, but rather a batch scanning of public websites, so the judgment that 'our scale is small and we will not be targeted' is not valid.
Where are the three layers of attack surface concentrated?
The first layer is the entry point. The login port, form, and upload interface are the most frequently hit during scanning. Once the validation logic has a flaw, unauthenticated requests may write files or execute code. The second layer is the extended components. After the core of the platform is completed, plugins and templates may still carry old problems, and large-scale exploitation activities often rely on this layer to continue to obtain entry points. The third layer is the operation and maintenance habits. Long-term failure to change the administrator credentials, not making backups, and not knowing which files in the site have been changed determine whether the site can recover after an accident.
| Protection layer | The things to do | The corresponding capabilities within the site. | Verification method |
|---|---|---|---|
| Entry layer | Tighten login and form validation, enable robot verification | Built-in JWT authentication, reCAPTCHA captcha | Try each time with incorrect credentials and scripts |
| Input layer | Parameters only accept whitelist, content filtering | SQL injection and XSS defense, sensitive word filtering | Check if the abnormal parameters are rejected and fall back to the default value |
| Component layer | Version following, clean up unused extensions | Version update records and upgrade prompts | List a list of components in use |
| Recovery layer | Regular backup, backup before upgrade | Backup and recovery (including static files) | Perform a real recovery exercise |
How to arrange the three things required to report
The first step is the patch rhythm. Write 'who is responsible for the version and how often to check' into the duty roster, instead of relying on someone's attention. The second step is a trusted backup. Recovery can only use known trusted backups, and making a backup after being attacked is equivalent to backing up the backdoor as well. The third step is to clear residues. A common measure for sites like WordPress is to replace the modified core files and theme files, and within the site, you can use a site-wide replacement tool to batch correct the modified links and keywords, check whether the menu has been added with a strange entry with the help of navigation settings, and the email reminder is responsible for notifying the duty person of abnormal releases.
The repair form on the platform is worth a separate look
The site working with routine patches will encounter two typical defects. One is that sorting parameters are spliced into the query: AnQiCMS changed the list sorting parameters to a strict identifier whitelist in v3.6.6, accepting only column names and ascending/descending keywords, blocking time blind injection;Another type is the login credentials made into long-term valid tickets, the same version changes the jump login to a one-time ticket issued by the server, which is invalid after one use.This common experience from these two repairs is: parameter validation should be in the allowed list rather than the denied list, credentials should have clear expiration conditions. The upgrade prompt also requires the rotation of the signature keys of all sites and the change of all administrator passwords - if the site has been hacked, simply upgrading does not equal clearing the session obtained by the other party.
The disposal sequence after being scanned
First, cut off the affected area (temporarily close the affected entry), then collect evidence (retain the modified files and logs), then upgrade and rotate credentials, and finally recover from a trusted backup and review. After the recovery is completed, do not immediately remove the monitoring. Continuous scanning and exploitation attempts after the vulnerability is disclosed are a common form of such activities, and the notification also requires that patches be installed as soon as possible.
Common questions
Do small-scale sites need a special patch window?Yes, batch scanning does not consider the scale, but the version and entry characteristics, the window can be arranged on a weekly basis.
If a firewall is installed, do you still need to upgrade?The firewall blocks known features, and the patch fixes the cause, neither can replace the other.
How often should the backup be done?Determine according to the frequency of content updates, at least to ensure that 'there is a backup available on the day before any upgrade'.
How to confirm that no backdoor has been left?Compare the file list with the administrator accounts in the database, check the navigation and scheduled tasks, and clean up the abnormal records after retaining them.