Out-of-Bounds Read in Netcore NR255-V Router

Executive Summary

This vulnerability is an out-of-bounds read issue in Netcore NR255-V version 1.5.130703. It occurs in the filter_arp_put_file.cgi component due to improper use of a string handling API. Attackers can exploit this to cause an unterminated buffer over-read, which may expose adjacent memory contents.

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Detection Guidance

Detecting this vulnerability requires checking for the affected Netcore NR255-V version 1.5.130703. Inspect network devices running this firmware and verify if filter_arp_put_file.cgi is accessible. Look for unusual memory exposure or buffer over-read events in system logs.

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Impact Analysis

An attacker could exploit this flaw to read sensitive memory data, potentially leading to information disclosure. This might include credentials, configuration details, or other sensitive information stored in memory adjacent to the vulnerable buffer.

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Mitigation Strategies

Immediately update Netcore NR255-V to a patched version if available. If no patch exists, restrict access to filter_arp_put_file.cgi via network segmentation or firewall rules. Monitor for suspicious activity and consider disabling the affected component until a fix is applied.

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