CVE-2020-6994 : Exploit Details and Defense Strategies

A buffer overflow vulnerability in Hirschmann Automation and Control HiOS and HiSecOS allows attackers to craft HTTP requests to overflow internal buffers.

Understanding CVE-2020-6994

What is CVE-2020-6994?

This CVE identifies a buffer overflow vulnerability in certain devices of Hirschmann Automation and Control HiOS and HiSecOS due to improper parsing of URL arguments.

The Impact of CVE-2020-6994

The vulnerability could be exploited by attackers to execute arbitrary code or crash affected devices, potentially leading to a denial of service (DoS) condition.

Technical Details of CVE-2020-6994

Vulnerability Description

The vulnerability arises from improper handling of URL arguments, allowing attackers to overflow internal buffers by crafting malicious HTTP requests.

Affected Systems and Versions

HiOS devices running version 07.0.02 and lower: RSP, RSPE, RSPS, RSPL, MSP, EES, EESX, GRS, OS, RED
HiSecOS device EAGLE20/30 running version 03.2.00 and lower

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted HTTP requests to the affected devices, causing buffer overflows and potentially executing malicious code.

Mitigation and Prevention

Immediate Steps to Take

Apply patches or updates provided by Hirschmann Automation and Control GmbH to address the vulnerability.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly monitor and update firmware on all network devices to protect against known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Ensure all affected devices are updated with the latest firmware releases from the vendor to mitigate the vulnerability.