CVE-2020-7503 in Easergy T300
Summary
by MITRE
A CWE-352: Cross-Site Request Forgery (CSRF) vulnerability exists in Easergy T300 (Firmware version 1.5.2 and older) which could allow an attacker to execute malicious commands on behalf of a legitimate user when xsrf-token data is intercepted.
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Analysis
by VulDB Data Team • 06/17/2020
The CVE-2020-7503 vulnerability represents a critical cross-site request forgery flaw affecting Easergy T300 devices running firmware versions 1.5.2 and earlier. This vulnerability falls under CWE-352, which specifically addresses CSRF attacks where unauthorized commands can be executed on behalf of authenticated users. The Easergy T300 is a network management device commonly used in industrial environments for monitoring and controlling electrical systems, making this vulnerability particularly concerning for operational technology infrastructure. The device's web interface serves as the attack vector where the CSRF flaw manifests, potentially allowing malicious actors to manipulate device configurations or execute commands without proper authorization.
The technical implementation of this vulnerability stems from the device's insufficient protection mechanisms against cross-site request forgery attacks. When legitimate users interact with the device's web interface, the system should validate that requests originate from authorized sources and contain proper authentication tokens. However, the Easergy T300 fails to adequately implement anti-CSRF measures, particularly in how it handles xsrf-token data. When an attacker intercepts this token through various means such as man-in-the-middle attacks or by leveraging other vulnerabilities, they can craft malicious requests that appear legitimate to the device's authentication system. The vulnerability specifically exploits the absence of proper token validation or the reuse of tokens in ways that don't adequately prevent unauthorized command execution.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it allows attackers to perform authenticated actions on behalf of legitimate users within the device's administrative context. This could enable attackers to modify device configurations, change network settings, reset system parameters, or potentially disrupt critical infrastructure operations. In industrial environments where Easergy T300 devices are deployed for electrical system monitoring, such an attack could lead to service disruptions, unauthorized access to sensitive operational data, or even physical security compromises if the device controls critical electrical infrastructure. The vulnerability's exploitation requires minimal technical expertise, making it particularly dangerous as it can be leveraged by attackers with basic web security knowledge.
Mitigation strategies for CVE-2020-7503 should prioritize immediate firmware updates to versions that address the CSRF implementation flaws. Organizations should also implement network segmentation to limit access to these devices and ensure that only authorized personnel can interact with the web interface. The implementation of additional authentication layers such as two-factor authentication or certificate-based authentication can provide defense-in-depth against CSRF attacks. Network monitoring solutions should be deployed to detect unusual patterns of requests that might indicate CSRF attack attempts. According to ATT&CK framework, this vulnerability maps to T1566 (Phishing) and T1190 (Exploit Public-Facing Application) techniques, as attackers could use social engineering to trick users into visiting malicious sites or directly exploit the device's web interface. Organizations should also consider implementing web application firewalls to filter malicious requests and establish proper access controls through network ACLs to restrict direct web interface access to trusted networks only.