A vulnerability was found in LB-LINK AC1900 Router 1.0.2 and classified as critical. The issue affects the function websGetVar in the file /goform/set_blacklist. The manipulation of the argument mac/enable leads to OS command injection. This vulnerability allows for remote exploitation. The exploit has been disclosed publicly, indicating that it may be used by potential attackers. The vendor was notified prior to this disclosure but did not respond.
The severity of this vulnerability is rated as medium, with a CVSS score of 5.3. The low attack complexity and the requirement for low privileges suggest that it could be exploited by attackers relatively easily, increasing the risk to organizations. Given its potential for remote exploitation, defenders should take this threat seriously.
Organizations should prioritize patching immediately to mitigate the risk associated with this vulnerability. The lack of vendor response may indicate a delay in remediation, further escalating the urgency for affected users.
The attack vector for this vulnerability is through the network, and the potential impacts include loss of confidentiality, integrity, and availability, which underscores the importance of addressing this issue promptly.
Vulnerability Details
The vulnerability in LB-LINK AC1900 Router 1.0.2 allows attackers to perform OS command injection via the manipulation of the mac/enable argument in the /goform/set_blacklist function. This vulnerability has been given a CVSS 3.1 score of 9.8, indicating critical severity due to the potential for remote exploitation without authentication.
The CVSS vector string indicates that the attack vector is network-based, with low complexity and no user interaction required. The impact on confidentiality, integrity, and availability is rated as high.
Technical Analysis
The root cause of this vulnerability is a failure to properly validate input parameters in the web application. Attackers may leverage this flaw by sending crafted requests to the router, allowing them to execute arbitrary commands on the underlying operating system.
The attack vector is network-based, indicating that an attacker can exploit this vulnerability remotely. The attack complexity is low, meaning that no special conditions need to be met for the attack to succeed. Privileges required for exploitation are low, and user interaction is not necessary.
The potential impacts of this vulnerability include unauthorized access to sensitive information and the ability to manipulate router configurations, leading to service disruption. The confidentiality, integrity, and availability impacts are all rated as low, meaning that while the risk is present, it might not lead to significant data loss.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access and manipulation of device functions, leading to broader network vulnerabilities. With the capability for remote exploitation, the blast radius could extend beyond individual devices to encompass entire networks.
Organizations should assess the potential for exploitation within their environment, particularly those using LB-LINK AC1900 routers. Given the low attack complexity and the critical nature of the vulnerability, it is crucial to prioritize remediation efforts.
Urgency for remediation is high, as indicated by the CVSS score. Organizations should schedule immediate updates or replacements where applicable to minimize exposure.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected product is LB-LINK AC1900 Router firmware version 1.0.2. Organizations should assume that all versions prior to the vendor patch are vulnerable.
Mitigation & Remediation
Organizations should apply patches or updates from LB-LINK as soon as they become available. If an immediate patch is not available, consider disabling the affected functionality until a fix can be applied.
For enhanced security, organizations should also implement network segmentation to restrict access to sensitive devices and monitor network traffic for any anomalous behavior.
Continuous security testing can also be beneficial in identifying potential vulnerabilities before they can be exploited.
Detection Guidance
To detect potential exploitation, organizations should monitor logs for unexpected command executions and analyze network traffic for unusual patterns associated with OS command injection.
Behavioral anomalies in router configurations may also indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the ongoing risks associated with network-based devices and the importance of timely updates from vendors.
It represents a pattern of vulnerabilities that can lead to significant organizational risks if left unaddressed.
Security teams should prioritize the implementation of strong security controls and consider engaging red teaming services to actively test their defenses against such vulnerabilities.
Additionally, organizations should stay informed about trends in vulnerabilities and ensure their security practices adapt to evolving threats. Regularly reviewing and updating security policies is essential.
Organizations can enhance their overall security posture by adopting a proactive approach to vulnerability management and engaging in continuous improvement.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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