Description Preview
A critical path traversal vulnerability (CWE-22) exists in the web interfaces of Buffalo WSR-2533DHPL2 (firmware version 1.02 and earlier) and WSR-2533DHP3 (firmware version 1.24 and earlier) routers. This vulnerability allows unauthenticated remote attackers to bypass authentication mechanisms and potentially gain unauthorized access to the device. The vulnerability is part of a broader issue affecting multiple Arcadyan-based routers and modems, which have been reported to be under active exploitation in the wild.
Overview
The vulnerability (CVE-2021-20090) is a path traversal issue in the web interface of affected Buffalo router models. By exploiting this vulnerability, attackers can bypass authentication controls and access restricted functionality without providing valid credentials. This can lead to unauthorized configuration changes, information disclosure, and potentially complete compromise of the affected devices. The vulnerability has been classified as CWE-22 (Path Traversal) and is considered high risk due to the authentication bypass capabilities it provides to remote attackers. Reports indicate that similar vulnerabilities in Arcadyan-based devices have been actively exploited in the wild.
Remediation
To mitigate this vulnerability, users should:
- Update the firmware of affected devices to versions newer than 1.02 for WSR-2533DHPL2 and newer than 1.24 for WSR-2533DHP3, if available.
- If updates are not available, consider implementing network-level protections:
- Restrict access to the router's web interface from the internet
- Use a firewall to limit access to the management interface
- Change default credentials and use strong passwords
- Monitor for suspicious activities or unauthorized access attempts
- Contact Buffalo support for specific guidance if firmware updates are not yet available
- Consider replacing the affected devices if they cannot be updated or properly secured
References
- CERT Coordination Center Vulnerability Note: https://www.kb.cert.org/vuls/id/914124
- SecPod Blog on Active Exploitation: https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/
- Tenable Security Research: https://www.tenable.com/security/research/tra-2021-13
Early Warning
Armis Early Warning customers received an advanced alert on this vulnerability.
- Armis Alert Date
- Aug 8, 2021
- CISA KEV Date
- Nov 3, 2021
87days early
Industry ExposureMost to leastThis section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
- Accommodation & Food ServicesAccommodation & Food Services
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting
- Arts, Entertainment & RecreationArts, Entertainment & Recreation
- ConstructionConstruction
- Educational ServicesEducational Services
- Finance and InsuranceFinance and Insurance
- Health Care & Social AssistanceHealth Care & Social Assistance
- InformationInformation
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- ManufacturingManufacturing
- MiningMining
- Other Services (except Public Administration)Other Services (except Public Administration)
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services
- Public AdministrationPublic Administration
- Real Estate Rental & LeasingReal Estate Rental & Leasing
- Retail TradeRetail Trade
- Transportation & WarehousingTransportation & Warehousing
- UtilitiesUtilities
- Wholesale TradeWholesale Trade
