CVE-2021-22708 : Security Advisory and Response
Discover the CWE-347 vulnerability in Schneider Electric's EVlink products, allowing attackers to bypass signature verification. Learn about the impact, affected versions, and mitigation steps.
A CWE-347 vulnerability in EVlink City, EVlink Parking, and EVlink Smart Wallbox allows attackers to create a malicious firmware package, bypassing signature verification.
Understanding CVE-2021-22708
This CVE involves an Improper Verification of Cryptographic Signature vulnerability in Schneider Electric's EVlink products.
What is CVE-2021-22708?
CVE-2021-22708 is a security flaw in EVlink City, EVlink Parking, and EVlink Smart Wallbox devices that enables threat actors to craft malicious firmware and evade the signature verification process.
The Impact of CVE-2021-22708
The vulnerability could lead to unauthorized firmware modifications, potentially compromising the integrity and security of the affected EVlink products.
Technical Details of CVE-2021-22708
This section delves into the specifics of the vulnerability.
Vulnerability Description
The CWE-347 flaw allows attackers to exploit the improper verification of cryptographic signatures in EVlink City, EVlink Parking, and EVlink Smart Wallbox, paving the way for malicious firmware installation.
Affected Systems and Versions
All versions of EVlink City (EVC1S22P4 / EVC1S7P4), EVlink Parking (EVW2 / EVF2 / EV.2), and EVlink Smart Wallbox (EVB1A) before R8 V3.4.0.1 are impacted by this vulnerability.
Exploitation Mechanism
Attackers can create a malicious firmware package to exploit the vulnerability, allowing them to bypass the signature verification mechanism in the affected Schneider Electric EVlink products.
Mitigation and Prevention
Protecting your systems from CVE-2021-22708 is crucial for maintaining security.
Immediate Steps to Take
- Apply the latest firmware updates provided by Schneider Electric to mitigate the vulnerability.
- Monitor for any unauthorized firmware modifications on EVlink City, EVlink Parking, and EVlink Smart Wallbox devices.
Long-Term Security Practices
Implement strong access controls, network segmentation, and regular security audits to enhance the overall security posture of your EVlink systems.
Patching and Updates
Stay informed about security advisories from Schneider Electric and promptly apply patches to keep your EVlink products secure.