CVE-2021-20091 describes a high-severity vulnerability affecting the web interfaces of Buffalo WSR-2533DHPL2 firmware version 1.02 and earlier, as well as WSR-2533DHP3 firmware version 1.24 and earlier. This vulnerability allows authenticated remote attackers to manipulate device configurations, potentially leading to remote code execution. With a CVSS score of 8.8, this vulnerability poses a significant risk to organizations utilizing these devices.
The vulnerability was published on April 29, 2021, and has since been modified, indicating new information or updates have been released. The exploitation status remains critical, and organizations should prioritize patching immediately to mitigate potential attacks.
Risk to organizations includes potential unauthorized access, configuration alterations, and the possibility of remote code execution by attackers leveraging this vulnerability. Immediate action is required to safeguard affected systems.
Organizations using the affected Buffalo devices should take proactive measures to apply patches and updates that address this vulnerability and consult their device documentation for further guidance.
Vulnerability Details
The vulnerability is characterized by improper input sanitization in the web interfaces of the impacted firmware versions. The official CVE description highlights that an authenticated remote attacker could leverage this vulnerability to alter device configuration, which could lead to remote code execution.
The CVSS score of 8.8 indicates a high severity level, reflecting a significant potential impact on confidentiality, integrity, and availability. The attack vector is classified as NETWORK, with low complexity and the requirement for low privileges, indicating that attackers only need to authenticate to exploit this vulnerability.
Technical Analysis
The root cause of this vulnerability is the failure to properly sanitize user input across the web interfaces of the affected Buffalo devices. Attackers can exploit this flaw by sending crafted input that the system does not adequately validate, allowing them to execute arbitrary commands.
The attack vector is network-based, and the complexity is low, allowing attackers to exploit the vulnerability without requiring advanced skills. The level of privileges required is also low, as authenticated users can initiate the attack without needing additional credentials. Notably, user interaction is not required for this exploit, making it easier for attackers to execute.
The impacts of this vulnerability are severe, with high scores in confidentiality, integrity, and availability assessments. An attacker successfully exploiting this vulnerability could gain unauthorized access to sensitive information, alter configurations, and disrupt device functionality.
Risk & Impact Analysis
Organizations deploying affected Buffalo devices face considerable risks due to this vulnerability. The potential for attackers to gain unauthorized access to network configurations could lead to significant disruptions and data breaches. Given the nature of the devices, the impact could extend beyond individual systems, affecting entire networks and services.
The urgency for remediation is heightened by the high CVSS score and the risk of exploitation. Organizations should address this vulnerability in their priority patch cycle to mitigate the risks associated with potential exploitation.
In light of these risks, organizations should also consider implementing network controls and monitoring solutions to detect any unauthorized access attempts or anomalies in device behavior.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include Buffalo WSR-2533DHPL2 firmware version 1.02 and earlier, and Buffalo WSR-2533DHP3 firmware version 1.24 and earlier. Organizations utilizing these devices should verify their firmware versions and take immediate action to update to the latest patched versions.
Mitigation & Remediation
Organizations should apply available patches and updates to mitigate this vulnerability. Upgrade to the latest firmware versions provided by Buffalo to ensure the vulnerabilities are addressed. If patches are not immediately available, consider implementing configuration hardening measures, such as restricting access to the web interface and enhancing authentication controls.
Monitoring network traffic for unusual activity and employing intrusion detection systems can also help identify potential exploitation attempts. For additional guidance, organizations can review resources on penetration testing and vulnerability management best practices.
Detection Guidance
Organizations should monitor logs for indicators of unauthorized access attempts or configuration changes. Key indicators include unusual login attempts and access to sensitive configuration settings. Behavioral anomalies in device performance should also be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-20091 highlights the importance of regular firmware updates and security patch management. This vulnerability represents a broader trend of network devices being targeted for exploitation due to inadequate input validation. Security teams should take lessons from this incident to strengthen their security posture and ensure robust validation mechanisms are in place.
Organizations should consider investing in penetration testing methodologies to rigorously assess their network security and identify similar vulnerabilities. Furthermore, adopting a proactive security strategy incorporating continuous monitoring and vulnerability assessments is crucial.
To enhance organizational resilience against such vulnerabilities, organizations should also explore vulnerability management programs designed to systematically address and remediate security flaws in devices.
Finally, security teams can benefit from establishing a robust incident response plan that enables swift action against potential exploitation of vulnerabilities like CVE-2021-20091.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)