CVE-2021-27335 : What You Need to Know

KollectApps before 4.8.16c is affected by insecure Java deserialization, leading to Remote Code Execution via a ysoserial.payloads.CommonsCollections parameter.

Understanding CVE-2021-27335

This CVE-2021-27335 vulnerability affects KollectApps versions before 4.8.16c due to insecure Java deserialization, enabling Remote Code Execution.

What is CVE-2021-27335?

The CVE-2021-27335 vulnerability in KollectApps arises from insecure Java deserialization, allowing threat actors to execute code remotely by exploiting a specific parameter.

The Impact of CVE-2021-27335

The impact of CVE-2021-27335 is severe as it opens up systems running vulnerable KollectApps versions to potential Remote Code Execution attacks, putting sensitive data and system integrity at risk.

Technical Details of CVE-2021-27335

KollectApps before 4.8.16c is prone to insecure Java deserialization, which threat actors can leverage to achieve Remote Code Execution.

Vulnerability Description

The vulnerability stems from a flaw in deserialization that can be misused to execute arbitrary code remotely.

Affected Systems and Versions

KollectApps versions earlier than 4.8.16c are vulnerable to this exploit.

Exploitation Mechanism

Hackers can exploit this vulnerability through a specific ysoserial.payloads.CommonsCollections parameter.

Mitigation and Prevention

It is crucial to take immediate steps to address CVE-2021-27335 to enhance system security.

Immediate Steps to Take

Update KollectApps to version 4.8.16c or latest to patch the vulnerability.
Implement strict input validation mechanisms to prevent untrusted deserialization.

Long-Term Security Practices

Regularly monitor for security updates and patches from KollectApps.
Educate developers on secure coding practices, especially around deserialization.

Patching and Updates

Ensure timely application of security patches and updates to mitigate the risk of Remote Code Execution due to insecure Java deserialization.