CVE-2021-1333:Multiple vulnerabilities in Cisco Small Business RV Series Routers' management interface allow authenticated remote attackers to execute arbitrary code or cause denial of service.

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Multiple vulnerabilities exist in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers. These vulnerabilities stem from improper validation of user-supplied input, allowing authenticated remote attackers with valid administrator credentials to send crafted HTTP requests that can execute arbitrary code as root or cause the device to reload, resulting in a denial of service (DoS) condition.

Overview

The affected Cisco Small Business RV Series Routers contain critical vulnerabilities in their web-based management interface that could be exploited by authenticated attackers. The vulnerabilities are caused by insufficient input validation mechanisms, allowing specially crafted HTTP requests to be processed in an unsafe manner. When successfully exploited, an attacker can execute commands with root privileges on the underlying operating system or trigger a device reload. These vulnerabilities affect multiple router models in the RV series, including RV016, RV042, RV042G, RV082, RV320, and RV325. It's important to note that exploitation requires valid administrator credentials, which somewhat limits the attack surface.

Remediation

  1. Update affected Cisco Small Business RV Series Routers to the latest firmware version as recommended by Cisco.
  2. If immediate patching is not possible, implement the following mitigations:
    • Restrict management interface access to trusted administrators and trusted networks only
    • Implement strong password policies for administrator accounts
    • Monitor for suspicious login attempts and unusual activity on the management interface
    • Consider implementing network segmentation to isolate the management interface
  3. Regularly check Cisco's security advisories for updates on these vulnerabilities
  4. After patching, verify that the update was successful by checking the firmware version

References

  1. Cisco Security Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-overflow-ghZP68yj
  2. National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2021-1333
  3. Cisco Product Security Incident Response Team (PSIRT): https://www.cisco.com/c/en/us/about/security-center.html

Industry ExposureMost to least
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.

  1. Accommodation & Food Services
    Accommodation & Food Services
  2. Administrative, Support, Waste Management & Remediation Services
    Administrative, Support, Waste Management & Remediation Services
  3. Agriculture, Forestry Fishing & Hunting
    Agriculture, Forestry Fishing & Hunting
  4. Arts, Entertainment & Recreation
    Arts, Entertainment & Recreation
  5. Construction
    Construction
  6. Educational Services
    Educational Services
  7. Finance and Insurance
    Finance and Insurance
  8. Health Care & Social Assistance
    Health Care & Social Assistance
  9. Information
    Information
  10. Management of Companies & Enterprises
    Management of Companies & Enterprises
  11. Manufacturing
    Manufacturing
  12. Mining
    Mining
  13. Other Services (except Public Administration)
    Other Services (except Public Administration)
  14. Professional, Scientific, & Technical Services
    Professional, Scientific, & Technical Services
  15. Public Administration
    Public Administration
  16. Real Estate Rental & Leasing
    Real Estate Rental & Leasing
  17. Retail Trade
    Retail Trade
  18. Transportation & Warehousing
    Transportation & Warehousing
  19. Utilities
    Utilities
  20. Wholesale Trade
    Wholesale Trade

Focus on What Matters

  1. See Everything.
  2. Identify True Risk.
  3. Proactively Mitigate Threats.

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