Description Preview
A critical security vulnerability (CVE-2020-9279) has been identified in D-Link DSL-2640B B2 EU_4.01B devices. The affected routers contain a hard-coded account with high privileges that can be used to log in to the management interface. Once authenticated, an attacker can perform critical administrative tasks and gain full control over the device. This type of vulnerability (CWE-798: Use of Hard-coded Credentials) represents a significant security risk as it provides a backdoor that cannot be changed by end users.
Overview
The D-Link DSL-2640B router contains a hard-coded account with administrative privileges embedded in the firmware. This vulnerability allows attackers who discover these credentials to gain complete control over the affected device regardless of any password changes made by the legitimate owner. Once authenticated, an attacker can modify network configurations, intercept traffic, use the device as a pivot point for further network attacks, or modify firmware. This vulnerability affects D-Link DSL-2640B B2 devices running EU_4.01B firmware version.
Remediation
Users of affected D-Link DSL-2640B devices should take the following actions:
- Check the D-Link security bulletin page for firmware updates that address this vulnerability
- Update to the latest firmware version if available
- If no patch is available, consider replacing the device with a more secure alternative
- As a temporary mitigation, restrict management interface access to trusted IP addresses only
- Disable remote management functionality if not required
- Monitor for suspicious login attempts and unauthorized configuration changes
- Place the device behind another firewall if possible to add an extra layer of protection
References
- Detailed vulnerability analysis: https://raelize.com/advisories/CVE-2020-9279_D-Link-DSL-2640B_Hard-coded-privileged-account_v1.0.txt
- Additional D-Link DSL-2640B security advisories: https://raelize.com/posts/d-link-dsl-2640b-security-advisories/
- D-Link security bulletins and firmware updates: https://www.dlink.com/en/security-bulletin
- MITRE CWE-798 (Use of Hard-coded Credentials): https://cwe.mitre.org/data/definitions/798.html
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
