Overview
In the constantly evolving landscape of cybersecurity, vulnerabilities are unearthed and addressed on a regular basis. This particular post dives into a critical vulnerability discovered in several Linksys range extender models, which could potentially trigger a stack-based buffer overflow. The exploit is a concern as it can be triggered remotely, and it opens up the possibility of system compromise or data leakage. Moreover, the exploit is now public knowledge, hence increasing the urgency to address it. The vulnerability is designated as CVE-2025-9361, and the severity of the issue is significant enough to warrant immediate attention and mitigation.
Vulnerability Summary
CVE ID: CVE-2025-9361
Severity: High (CVSS Score: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Linksys RE6250 | 1.0.013.001/1.0.04.001/1.0.04.002
Linksys RE6300 | 1.0.013.001/1.0.04.001/1.0.04.002
Linksys RE6350 | 1.0.013.001/1.0.04.001/1.0.04.002
Linksys RE6500 | 1.0.013.001/1.0.04.001/1.0.04.002
Linksys RE7000 | 1.1.05.003
Linksys RE9000 | 1.2.07.001
How the Exploit Works
The exploit takes advantage of a buffer overflow vulnerability. By manipulating the argument ‘ipRangeBlockRuleName/scheduleIp/ipRangeBlockRuleIpAddr’ in the ‘ipRangeBlockManageRule’ function of the ‘/goform/ipRangeBlockManageRule’ file, an attacker can cause a stack-based buffer overflow. This overflow can lead to arbitrary code execution or cause the system to crash, compromising the integrity of the device and potentially leading to data leakage.
Conceptual Example Code
Below is a conceptual example of how this vulnerability might be exploited:
POST /goform/ipRangeBlockManageRule HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
ipRangeBlockRuleName=ANY_NAME&scheduleIp=ANY_IP&ipRangeBlockRuleIpAddr=ANY_IP_ADDRESS&overflow_data=LONG_STRING_TO_TRIGGER_OVERFLOWIn the above hypothetical example, the ‘overflow_data’ field is loaded with an excessively long string to trigger a buffer overflow.
Please note that this example is conceptual and should not be used to exploit real systems. It is provided for educational purposes to understand the nature of the vulnerability and to facilitate its mitigation.