CVE-2020-7655:HTTP Request Smuggling vulnerability in netius prior to 1.17.58 due to incorrect Transfer encoding header parsing.

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The netius Python library before version 1.17.58 contains a vulnerability related to HTTP Request Smuggling. The issue stems from incorrect parsing of Transfer encoding headers, which could allow attackers to perform CL:TE (Content-Length:Transfer-Encoding) or TE:TE (Transfer-Encoding:Transfer-Encoding) attacks. This vulnerability could enable request smuggling attacks and potentially lead to HTTP pipelining issues, allowing attackers to bypass security controls, gain unauthorized access to sensitive data, or perform other malicious actions.

Overview

HTTP Request Smuggling (CWE-444) is a technique that exploits differences in how front-end and back-end servers process HTTP requests. In netius prior to version 1.17.58, the improper handling of Transfer encoding headers creates a security gap that attackers can exploit. When a server incorrectly interprets or processes HTTP headers related to message framing, it can lead to request smuggling vulnerabilities. This particular vulnerability allows for both CL:TE and TE:TE attack vectors, which are two common HTTP Request Smuggling techniques. Successful exploitation could allow attackers to bypass security controls, poison web caches, or hijack user sessions.

Remediation

To address this vulnerability, users should upgrade netius to version 1.17.58 or later. If immediate upgrading is not possible, consider implementing the following mitigations:

  1. Apply strict HTTP request validation at the application level
  2. Configure web application firewalls (WAFs) to detect and block potential HTTP request smuggling attempts
  3. Monitor logs for unusual HTTP request patterns that might indicate smuggling attempts
  4. Consider using alternative HTTP libraries if upgrading is not feasible in the near term

References

  1. Snyk Security Advisory: https://snyk.io/vuln/SNYK-PYTHON-NETIUS-569141
  2. CWE-444: Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)
  3. OWASP HTTP Request Smuggling information

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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