Improper Authentication in Linksys EA8100 Router

Executive Summary

This vulnerability is in the Linksys EA8100 router firmware version 1.0.3.216940. It involves improper handling of authentication attempts in the /jnap/core/CheckAdminPassword component. An attacker could exploit this to repeatedly attempt logins without proper restrictions, potentially bypassing security controls.

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Detection Guidance

This vulnerability involves improper restriction of excessive authentication attempts in Linksys EA8100 firmware. Detection may require manual inspection of authentication logs for repeated failed login attempts targeting /jnap/core/CheckAdminPassword. Check for unusual network traffic patterns or brute-force attempts against the device's web interface.

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Impact Analysis

An attacker could remotely exploit this to gain unauthorized access to the router's admin interface. This may allow them to change network settings, intercept traffic, or install malicious firmware. The difficulty of exploitation is high but possible with public exploit availability.

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Compliance Impact

This vulnerability involves improper restriction of excessive authentication attempts, enabling brute-force attacks. While not directly linked to GDPR or HIPAA, such flaws could lead to unauthorized access to sensitive data, potentially violating compliance requirements for data protection and security controls.

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Mitigation Strategies

Isolate the affected Linksys EA8100 device from critical networks. Disable remote administration if not required. Implement rate limiting or account lockout policies for authentication attempts. Monitor for suspicious activity and consider replacing the device if no patches are available from the vendor.

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