CVE-2021-42794 : Exploit Details and Defense Strategies

A vulnerability in AVEVA Edge allows for potential port scanning by exploiting a malicious connection string.

Understanding CVE-2021-42794

What is CVE-2021-42794?

AVEVA Edge (formerly InduSoft Web Studio) versions R2020 and prior are susceptible to a security flaw where a client can input a malicious connection string, leading to the possibility of LAN port scanning based on hosts' responses.

The Impact of CVE-2021-42794

The vulnerability could be exploited by an attacker to perform unauthorized port scans within the LAN, compromising network security and potentially exposing sensitive information.

Technical Details of CVE-2021-42794

Vulnerability Description

The issue arises from AVEVA Edge's improper handling of connection strings, allowing malicious inputs that may trigger unintended port scans.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: R2020 and earlier
Status: Affected

Exploitation Mechanism

The vulnerability can be exploited by inputting a specifically crafted connection string, enabling an attacker to manipulate the application to conduct port scanning activities.

Mitigation and Prevention

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to address the vulnerability.
Restrict access to potentially vulnerable systems and applications.
Monitor network traffic for any suspicious activities or unauthorized access attempts.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Implement network segmentation to limit the scope of potential attacks within the LAN.

Patching and Updates

Regularly check for security advisories from AVEVA and apply recommended patches and updates to ensure system security.