CVE-2019-17621 is a critical vulnerability that impacts the D-Link DIR-859 Wi-Fi router versions 1.05 and 1.06B01 Beta01. This vulnerability allows an unauthenticated remote attacker to execute system commands as root by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connected to the local network. With a CVSS score of 9.8, this vulnerability is categorized as critical and poses significant risks to organizations using affected devices.
The severity of this vulnerability is underscored by its potential impact on confidentiality, integrity, and availability, all rated as high. Organizations should prioritize patching immediately as the risk to operations and sensitive information is substantial.
This vulnerability has been acknowledged in the Known Exploited Vulnerabilities (KEV) catalog as of June 29, 2023, indicating that it is actively exploited in the wild. The urgency for defenders is clear, and immediate action to remediate this vulnerability is essential.
Organizations using the D-Link DIR-859 router must ensure that they apply the necessary updates provided by the vendor or consider discontinuing use if patches are unavailable to avoid potential breaches.
Vulnerability Details
The official description of CVE-2019-17621 states that the UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router versions 1.05 and 1.06B01 Beta01 allows an unauthenticated remote attacker to execute system commands as root. The vulnerability is classified under CWE-78 (Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')).
This vulnerability has a CVSS score of 9.8, indicating a critical severity level due to its high impact on confidentiality, integrity, and availability. It is crucial for organizations to understand the potential ramifications of this flaw and to take action swiftly.
The vulnerability was published on December 30, 2019, and has been analyzed thoroughly since then. Organizations should ensure their products are updated to the latest firmware versions to mitigate this risk.
Technical Analysis
The root cause of CVE-2019-17621 lies within the UPnP service on the D-Link DIR-859 router, wherein an attacker can exploit the /gena.cgi endpoint through improper input validation. The attack vector is network-based, requiring no privileges or user interaction from the target. The attack complexity is low, making this vulnerability particularly dangerous.
Given the high impact on confidentiality, integrity, and availability, organizations must be aware of the potential for unauthorized access and control over affected devices. This vulnerability could allow attackers to manipulate router settings or intercept network traffic, leading to further exploitation.
Risk & Impact Analysis
The risk to organizations includes unauthorized command execution, which could lead to full compromise of the router and potentially the entire local network. The blast radius is significant, as many users may be affected if the router is used in a home or small office environment.
Urgency for remediation is underscored by the fact that this vulnerability is included in the KEV catalog. Organizations should address this vulnerability in their priority patch cycle, especially given the active exploitation status.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions of the D-Link DIR-859 router include firmware versions 1.05 and 1.06B01 Beta01. Organizations using these versions should check for updates and apply them promptly.
Mitigation & Remediation
To remediate this vulnerability, D-Link has released patches that users must apply to their routers. Organizations should refer to the vendor's advisory for detailed instructions on updating firmware. In the absence of a patch, it is advisable to discontinue the use of the affected product until a fix is available. Additionally, organizations should consider implementing network controls to limit exposure to untrusted networks.
Pentesting services can also help identify any remaining security issues post-remediation.
Detection Guidance
Organizations should monitor logs for any unusual access patterns or command execution attempts originating from unauthorized devices. Behavioral anomalies in network traffic should also be assessed to identify potential exploitation of this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2019-17621 illustrates the persistent risk posed by vulnerabilities in widely used consumer devices. The trend of exploiting UPnP services highlights the need for security teams to implement comprehensive security measures in their environments.
Organizations should invest in ongoing security awareness and vulnerability management programs to reduce exposure to similar threats in the future. Regular assessments and updates of network devices are critical for maintaining a secure posture.
Vulnerability management programs can be essential in identifying and mitigating risks from vulnerabilities like CVE-2019-17621.
Penetration testing methodologies should be integrated into the security strategy to proactively address vulnerabilities.
API security testing can also provide insights into potential weaknesses in the configuration of network services.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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