CVE-2021-28977 : Vulnerability Insights and Analysis

A Cross Site Scripting vulnerability was discovered in GetSimpleCMS 3.3.16 in admin/upload.php. Attackers could exploit this by injecting comments or file header info into xla, pages, and gzip files.

Understanding CVE-2021-28977

This section provides insight into the critical aspects of the CVE-2021-28977 vulnerability.

What is CVE-2021-28977?

The CVE-2021-28977 vulnerability involves a Cross Site Scripting flaw in GetSimpleCMS 3.3.16. By manipulating specific file content, attackers could inject malicious code into certain files within the CMS.

The Impact of CVE-2021-28977

This vulnerability could lead to unauthorized access, data theft, or other malicious activities on websites running the affected version of GetSimpleCMS, potentially compromising the security and integrity of the CMS and its hosted content.

Technical Details of CVE-2021-28977

Here, we delve into the technical specifics of CVE-2021-28977.

Vulnerability Description

The vulnerability enables attackers to conduct Cross Site Scripting attacks through the manipulation of xla, pages, and gzip files in the GetSimpleCMS 3.3.16 version by injecting comments or file header information.

Affected Systems and Versions

GetSimpleCMS version 3.3.16 is affected by this vulnerability. Users running this version are at risk of exploitation unless appropriate security measures are implemented.

Exploitation Mechanism

By inserting malicious comments or file header data into specific file types, threat actors can execute Cross Site Scripting attacks on vulnerable installations of GetSimpleCMS.

Mitigation and Prevention

This section outlines the necessary steps to mitigate and prevent the risks associated with CVE-2021-28977.

Immediate Steps to Take

Update GetSimpleCMS to a patched version that addresses the Cross Site Scripting vulnerability in version 3.3.16.
Evaluate and sanitize all uploaded content and file types within the CMS to prevent injection attacks.

Long-Term Security Practices

Regularly monitor and audit the CMS for any suspicious activity or unauthorized file modifications.
Educate users and administrators on secure coding practices and the risks associated with untrusted file uploads.

Patching and Updates

Stay informed about security updates and patches released by GetSimpleCMS developers. Promptly apply all relevant updates to fix known vulnerabilities and enhance system security.