CVE-2021-27418 : Security Advisory and Response
Explore CVE-2021-27418, a vulnerability in GE UR family firmware versions prior to 8.1x allowing cross-site scripting attacks. Learn about the impact, mitigation steps, and recommended updates.
This CVE-2021-27418 article provides insights into the GE UR family input validation vulnerability. Explore the impact, technical details, and mitigation strategies associated with this CVE.
Understanding CVE-2021-27418
CVE-2021-27418 is a vulnerability found in GE UR family firmware versions below 8.1x. It allows for potential cross-site scripting attacks due to improper user input validation.
What is CVE-2021-27418?
GE UR firmware versions earlier than 8.1x have a web interface with read-only access that lacks proper user input validation. This opens the door to cross-site scripting attacks, enabling the injection of malicious scripts.
The Impact of CVE-2021-27418
With a CVSS base score of 5.3 (Medium Severity), this vulnerability can be exploited over a network with low attack complexity. While it does not impact confidentiality, it can compromise the integrity of the system.
Technical Details of CVE-2021-27418
This section delves into the specifics of the vulnerability, including its description, affected systems, and the exploitation mechanism.
Vulnerability Description
GE UR family firmware versions prior to 8.1x fail to validate user input adequately, leaving them vulnerable to cross-site scripting attacks that can inject malicious scripts.
Affected Systems and Versions
The affected product is the UR family by GE, specifically versions earlier than 8.1x with a custom version type unspecified.
Exploitation Mechanism
The vulnerability is exploited by sending malicious scripts through the web interface due to the lack of proper validation and HTML encoding of user-supplied strings.
Mitigation and Prevention
Discover the steps you can take to mitigate the risks posed by CVE-2021-27418 and prevent potential exploitation.
Immediate Steps to Take
GE suggests updating UR devices to version 8.10 or above to address the vulnerabilities. Additionally, refer to GE Publication Number: GES-2021-004 for further mitigation details.
Long-Term Security Practices
GE recommends implementing defense-in-depth practices like network segmentation, access controls, and monitoring to enhance the security of UR IEDs.
Patching and Updates
Stay informed about the latest security patches and updates provided by GE to address vulnerabilities in the UR family firmware.