CVE-2020-27386 Explained : Impact and Mitigation
Learn about CVE-2020-27386, a vulnerability in FlexDotnetCMS allowing remote attackers to upload and execute arbitrary files. Find mitigation steps and long-term security practices here.
An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to upload and execute arbitrary files by using the FileManager to upload malicious code.
Understanding CVE-2020-27386
This CVE involves a security vulnerability in FlexDotnetCMS that enables an attacker to upload and execute arbitrary files.
What is CVE-2020-27386?
The vulnerability in FlexDotnetCMS before v1.5.9 permits an authenticated remote attacker to upload and execute malicious files by manipulating file extensions.
The Impact of CVE-2020-27386
The vulnerability allows attackers to upload and execute arbitrary files, potentially leading to unauthorized access, data theft, and system compromise.
Technical Details of CVE-2020-27386
This section provides more in-depth technical details of the CVE.
Vulnerability Description
The issue arises from an unrestricted file upload capability in FlexDotnetCMS, enabling attackers to upload and execute malicious files by manipulating file extensions.
Affected Systems and Versions
- Product: FlexDotnetCMS
- Versions affected: Before v1.5.9
Exploitation Mechanism
- Attacker uploads malicious code as a safe file type (e.g., TXT).
- Renames the file to an executable extension (e.g., ASP) using FileEditor or FileManager's rename function.
- Executes the file via an HTTP GET request to /<path_to_file>.
Mitigation and Prevention
Protecting systems from CVE-2020-27386 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update FlexDotnetCMS to version 1.5.9 or later to mitigate the vulnerability.
- Monitor file uploads and restrict executable file types.
- Implement proper access controls to limit file execution.
Long-Term Security Practices
- Conduct regular security assessments and penetration testing.
- Educate users on safe file handling practices.
- Implement a robust incident response plan.
Patching and Updates
- Apply security patches promptly.
- Stay informed about security updates and best practices.