CVE-2020-28926:Buffer overflow vulnerability in ReadyMedia (MiniDLNA) before version 1.3.0 allows remote code execution through malicious UPnP HTTP requests.

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A critical vulnerability has been identified in ReadyMedia (formerly known as MiniDLNA) versions prior to 1.3.0. The flaw involves a signedness bug that can lead to buffer overflow when processing HTTP chunked encoding in UPnP HTTP requests. When exploited, this vulnerability allows remote attackers to execute arbitrary code on the affected system without requiring authentication. The issue stems from improper validation of input data in the HTTP request handling code, which can lead to memory corruption through unsafe calls to memcpy/memmove functions.

Overview

ReadyMedia (MiniDLNA) is a lightweight DLNA/UPnP-AV server commonly used to share media files across home networks. The vulnerability (CVE-2020-28926) is classified as CWE-120 (Buffer Copy without Checking Size of Input), which is a classic buffer overflow vulnerability. When processing UPnP HTTP requests that use chunked encoding, the application fails to properly validate the size of the data being handled, leading to a signedness bug. This allows attackers to write data beyond the allocated buffer boundaries, potentially overwriting adjacent memory with malicious code. Since MiniDLNA typically runs with the privileges of the user who started it (often root in many installations), successful exploitation could lead to complete system compromise.

Remediation

To address this vulnerability, system administrators should take the following actions:

  1. Update ReadyMedia (MiniDLNA) to version 1.3.0 or newer as soon as possible.
  2. If immediate updating is not possible, consider implementing network-level controls to restrict access to the MiniDLNA service from untrusted networks.
  3. Debian users should apply the security updates provided in DLA 2489-1 (for Debian LTS) or DSA-4806 (for supported Debian releases).
  4. Consider running MiniDLNA with minimal privileges by using a dedicated non-privileged user account.
  5. Monitor system logs for unusual activity related to the MiniDLNA service.
  6. If you cannot update or implement mitigations, consider disabling the service until patches can be applied.

References

  1. Debian LTS Security Advisory: https://lists.debian.org/debian-lts-announce/2020/12/msg00017.html
  2. Debian Security Advisory DSA-4806: https://www.debian.org/security/2020/dsa-4806
  3. MiniDLNA Project Page: https://sourceforge.net/projects/minidlna/
  4. Technical Analysis of the Vulnerability: https://www.rootshellsecurity.net/remote-heap-corruption-bug-discovery-minidlna/
  5. Common Weakness Enumeration: CWE-120 (Buffer Copy without Checking Size of Input)

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

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Armis Vulnerability Intelligence Database