CVE-2021-22811 Explained : Impact and Mitigation
Discover the impact of CVE-2021-22811, a CWE-79 vulnerability affecting Schneider Electric products using NMC2 and NMC3, leading to potential script execution and security risks. Learn how to mitigate and prevent exploitation.
A CWE-79 vulnerability has been identified in Schneider Electric products that could lead to script execution when a request from a privileged account to a vulnerable web page is intercepted.
Understanding CVE-2021-22811
This CVE affects various Schneider Electric products utilizing Network Management Cards (NMC2 and NMC3) in their Uninterruptible Power Supply (UPS) systems.
What is CVE-2021-22811?
The vulnerability (CWE-79) involves improper input neutralization during web page generation, leading to potential cross-site scripting (XSS) attacks. It affects a range of 1-Phase and 3-Phase UPS systems incorporating NMC2 and NMC3.
The Impact of CVE-2021-22811
Exploitation of this vulnerability could enable threat actors to execute malicious scripts on the affected devices, compromising their integrity and potentially leading to unauthorized access.
Technical Details of CVE-2021-22811
The vulnerability exists in various Schneider Electric products, including Smart-UPS, Symmetra, Galaxy 3500, Symmetra PX, Gutor, and others, using specific versions of NMC2 and NMC3.
Vulnerability Description
The vulnerability arises due to the lack of proper input sanitization, allowing attackers to inject and execute scripts, posing a risk of XSS attacks.
Affected Systems and Versions
Products utilizing NMC2 and NMC3 with certain firmware versions are vulnerable. Refer to the CVE details for the exact product and version combinations.
Exploitation Mechanism
Threat actors can exploit this vulnerability by intercepting requests from privileged accounts to the affected web pages, subsequently executing malicious scripts.
Mitigation and Prevention
It is crucial to take immediate steps to mitigate the risks posed by CVE-2021-22811 and implement long-term security practices.
Immediate Steps to Take
Ensure the affected products are updated with the latest firmware provided by Schneider Electric. Implement network segmentation and access controls to limit exposure.
Long-Term Security Practices
Regularly monitor for security updates from Schneider Electric and apply patches promptly. Conduct security assessments to identify and address vulnerabilities in the infrastructure.
Patching and Updates
Refer to the official Schneider Electric advisory for specific instructions on patching and updating the affected products to secure them against CVE-2021-22811.