CVE-2021-34567 : Vulnerability Insights and Analysis
Understand CVE-2021-34567 affecting WAGO I/O-Check Service. Learn about the vulnerability, impact, affected systems, mitigation steps, and the importance of patching.
This article provides detailed information about CVE-2021-34567, a vulnerability affecting WAGO devices in the I/O-Check Service.
Understanding CVE-2021-34567
This section delves into what CVE-2021-34567 is, its impact, technical details, and mitigation strategies.
What is CVE-2021-34567?
CVE-2021-34567 is a vulnerability in the WAGO I/O-Check Service across multiple products. It allows an unauthenticated remote attacker to trigger a denial of service and a limited out-of-bounds read by sending a specially crafted packet containing OS commands.
The Impact of CVE-2021-34567
The impact of this vulnerability is significant, as it can result in a high availability impact due to a denial of service attack and overread buffers.
Technical Details of CVE-2021-34567
This section outlines the vulnerability description, affected systems and versions, as well as the exploitation mechanism.
Vulnerability Description
The vulnerability in the WAGO I/O-Check Service allows remote attackers to send malicious packets, triggering denial of service and out-of-bounds read scenarios.
Affected Systems and Versions
Products such as 750-81xx/xxx-xxxFW, 750-82xx/xxx-xxx, 752-8303/8000-0002, 762-4xxx, 762-5xxx, and 762-6xxx are impacted, with versions up to FW18 Patch 2.
Exploitation Mechanism
The vulnerability can be exploited by sending specially crafted packets containing OS commands to the I/O-Check Service, leading to a denial of service and out-of-bounds read.
Mitigation and Prevention
In this section, you will find immediate steps to take, long-term security practices, and the importance of patching and updates.
Immediate Steps to Take
Immediate steps to mitigate the risk include restricting network access, implementing firewalls, and applying patches from the vendor.
Long-Term Security Practices
Long-term security practices entail regular security assessments, network segmentation, and employee training to prevent similar vulnerabilities.
Patching and Updates
Ensure that you regularly check for security updates and patches released by WAGO to address CVE-2021-34567.