CVE-2021-36121 Explained : Impact and Mitigation

An unrestricted upload vulnerability in Echo ShareCare 8.15.5 allows remote attackers to upload arbitrary files to the filesystem and execute remote code as the ShareCare service user.

Understanding CVE-2021-36121

This vulnerability affects Echo ShareCare 8.15.5, enabling attackers to upload files and execute code remotely.

What is CVE-2021-36121?

An issue discovered in Echo ShareCare 8.15.5 allows the upload of arbitrary files via a file-upload feature, potentially leading to remote code execution.

The Impact of CVE-2021-36121

Exploitation of this vulnerability can result in attackers uploading malicious files and executing code on the target system, compromising its integrity.

Technical Details of CVE-2021-36121

This section provides detailed technical information about the vulnerability in Echo ShareCare 8.15.5.

Vulnerability Description

The vulnerability resides in the file-upload feature in Access/DownloadFeed_Mnt/FileUpload_Upd.cfm, allowing attackers to upload files using the name1 parameter.

Affected Systems and Versions

Echo ShareCare 8.15.5 is identified as the affected version by this vulnerability.

Exploitation Mechanism

Remote attackers can leverage the unrestricted upload vulnerability to write arbitrary files to the filesystem via directory traversal and execute code as the ShareCare service user.

Mitigation and Prevention

To secure systems from CVE-2021-36121, immediate actions must be taken along with long-term security practices.

Immediate Steps to Take

Implement access controls, validate user input, and restrict file-upload permissions immediately to prevent unauthorized file uploads.

Long-Term Security Practices

Regularly update and patch the Echo ShareCare application, conduct security audits, and educate users on safe file upload practices.

Patching and Updates

Apply security patches provided by the vendor promptly to mitigate the vulnerability and enhance system security.