Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-29520 is a reflected cross-site scripting (XSS) vulnerability found in the Hereta ETH-IMC408M firmware version 1.0.15 and earlier. It exists in the Network Diagnosis ping function, specifically in the handling of the ping_ipaddr parameter.'}, {'type': 'paragraph', 'content': 'The vulnerability allows attackers to inject arbitrary JavaScript code by crafting malicious URLs containing script payloads in the ping_ipaddr parameter. When an authenticated administrator clicks on such a malicious link, the injected script executes within their session.'}, {'type': 'paragraph', 'content': "This can lead to the compromise of the administrator's session and is classified under CWE-79, which involves improper neutralization of input during web page generation."}] [1]

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Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability can impact you by allowing attackers to execute arbitrary JavaScript code within the context of an authenticated administrator's session."}, {'type': 'paragraph', 'content': "If an administrator visits a maliciously crafted link exploiting this vulnerability, their session can be compromised, potentially leading to unauthorized actions or access within the device's management interface."}, {'type': 'paragraph', 'content': 'The attack requires user interaction (clicking the malicious link) but does not require any privileges or prior access.'}] [1]

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for HTTP requests containing the `ping_ipaddr` parameter with suspicious or script-injected values targeting the Network Diagnosis ping function of the Hereta ETH-IMC408M device.'}, {'type': 'paragraph', 'content': 'You can use network traffic inspection tools or web proxy logs to identify such requests.'}, {'type': 'list_item', 'content': 'Use a command like `tcpdump` or `tshark` to capture HTTP traffic and filter for the `ping_ipaddr` parameter, for example: `tshark -Y \'http.request.uri contains "ping_ipaddr"\'`.'}, {'type': 'list_item', 'content': 'Search web server or device logs for URLs containing `ping_ipaddr` with suspicious script tags or encoded JavaScript payloads.'}, {'type': 'list_item', 'content': 'Perform manual or automated testing by crafting URLs with script payloads in the `ping_ipaddr` parameter and observing if the device reflects the input without proper sanitization.'}] [1]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the Network Diagnosis ping function to trusted administrators only and avoiding clicking on suspicious or untrusted links containing the `ping_ipaddr` parameter.

Ensure that only authenticated administrators access the device interface and educate them about the risk of reflected XSS via malicious URLs.

If possible, update the firmware to a version later than 1.0.15 once a patch is available from the vendor.

As a temporary workaround, consider implementing web application firewall (WAF) rules to detect and block requests containing suspicious script payloads in the `ping_ipaddr` parameter.

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