A stored cross-site scripting (XSS) vulnerability has been identified in the spf_table_content component of Linksys E5600 Router firmware version 1.1.0.26. This flaw allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the desc parameter. With a CVSS score of 4.8, this vulnerability is classified as medium severity, indicating a significant risk but not an immediate critical threat.
Risk to organizations includes potential unauthorized access to sensitive information and manipulation of web content displayed to users. Since the attack vector is adjacent network, an attacker would need to be on the same local network as the target device to exploit this vulnerability. Organizations should address this vulnerability in their priority patch cycle to reduce exposure risk.
Currently, there are no known exploits or proof of concepts available, but the lack of public knowledge could change. Therefore, organizations using affected devices are advised to monitor for updates and apply patches as soon as they become available.
Organizations should prioritize patching immediately.
Vulnerability Details
The vulnerability allows attackers to execute arbitrary web scripts or HTML through a crafted payload injected into a parameter. The CVSS score of 4.8 indicates a medium severity level with low attack complexity and required user interaction.
The affected product is the Linksys E5600 Router running firmware version 1.1.0.26, published on January 15, 2025. The vulnerability is classified under CWE-79, which pertains to improper neutralization of input during web page generation (XSS).
Technical Analysis
The root cause of this vulnerability is improper input validation in the spf_table_content component. Attackers can exploit this vulnerability by sending crafted requests to the router, which may allow them to inject malicious scripts into the web interface.
The attack vector is adjacent network, meaning it requires the attacker to be connected to the same local network as the targeted router. The complexity of the attack is low, and it requires low privileges, with user interaction needed for the attack to succeed.
The impacts of this vulnerability include low confidentiality and integrity impacts, while availability is not affected. Organizations need to be aware of this risk due to the potential for data exposure and manipulation.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access to sensitive information and manipulation of web content displayed to users. Given that the attack vector is adjacent network, an attacker would need to be on the same local network as the target device to exploit this vulnerability. The potential blast radius is limited to users within the local network, but successful exploitation can lead to significant impacts if sensitive information is accessed.
Organizations should assess their exposure, particularly if they utilize Linksys routers in environments with unsecured local networks. The urgency for remediation is moderate, and patching should be prioritized accordingly.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version is Linksys E5600 Router firmware version 1.1.0.26. Organizations should note that this vulnerability exists in all versions prior to vendor patch.
Mitigation & Remediation
Organizations should check for firmware updates from Linksys and apply patches as soon as they become available to remediate this vulnerability. If a patch is not available, organizations should consider implementing workarounds such as restricting access to the router's web interface from untrusted networks.
Furthermore, organizations may enhance security through configuration hardening, ensuring that unnecessary services are disabled and that the router's management interface is protected with strong credentials.
Continuous security testing can help identify similar weaknesses in the environment. Organizations should validate remediation through continuous penetration testing to identify similar weaknesses.
Detection Guidance
Monitoring logs for unexpected changes or behaviors in the router’s management interface is crucial. Organizations should look for any unauthorized access attempts or unusual patterns that may indicate exploitation.
Behavioral anomalies, such as unexpected responses from the router or changes in web content displayed to users, can also serve as indicators of compromise.
AppSecure Threat Intelligence Insight
This vulnerability highlights the ongoing risk of XSS vulnerabilities in consumer networking devices. As more devices connect to the internet, the potential for exploitation increases, underscoring the need for robust security measures.
Security teams should prioritize scanning for similar vulnerabilities in their environments to prevent potential exploits. For comprehensive assessments, organizations should consider engaging in application security assessments to identify and rectify such issues.
This incident serves as a reminder of the importance of maintaining up-to-date firmware in all devices. Regular updates and security patches are critical to safeguarding against emerging threats. Organizations should also explore penetration testing services to bolster their defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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