CVE-2021-3243 : Security Advisory and Response

Wfilter ICF 5.0.117 contains a cross-site scripting (XSS) vulnerability that allows an attacker within the same LAN to inject a payload through a malicious User-Agent header, potentially leading to system takeover via plugin-running function.

Understanding CVE-2021-3243

This CVE identifier pertains to a cross-site scripting vulnerability found in Wfilter ICF 5.0.117.

What is CVE-2021-3243?

CVE-2021-3243 refers to an XSS vulnerability in Wfilter ICF 5.0.117 that enables an attacker in the same LAN to inject harmful payloads via a crafted packet.

The Impact of CVE-2021-3243

This vulnerability could allow an attacker to compromise the affected system by taking advantage of the plugin-running function.

Technical Details of CVE-2021-3243

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability in Wfilter ICF 5.0.117 enables an attacker to execute cross-site scripting attacks through a specially crafted User-Agent header.

Affected Systems and Versions

The affected version is Wfilter ICF 5.0.117.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a malicious packet with a crafted User-Agent header within the LAN, allowing them to inject and execute arbitrary code.

Mitigation and Prevention

Here are the steps to mitigate and prevent the exploitation of CVE-2021-3243.

Immediate Steps to Take

Ensure that network traffic is monitored and restrict access to potentially vulnerable components to prevent exploitation.

Long-Term Security Practices

Incorporate regular security assessments, implement network segmentation, and conduct security awareness training to enhance overall security posture.

Patching and Updates

Update Wfilter ICF to the latest version or apply patches provided by the vendor to address the XSS vulnerability.