CVE-2021-23365:Authentication Bypass vulnerability in Tyk Identity Broker before version 1.1.1 due to XML parser integrity issues in SAML authentication.

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The package github.com/tyktechnologies/tyk-identity-broker before version 1.1.1 contains an Authentication Bypass vulnerability (CWE-287) that affects the SAML authentication mechanism. The vulnerability exists because the Go XML parser used in the application doesn't guarantee integrity during XML round-trip operations (encoding and decoding XML data). This can allow attackers to bypass authentication controls and gain unauthorized access to protected resources by manipulating SAML assertions during the authentication process.

Overview

This vulnerability affects Tyk Identity Broker, which is a component used for handling identity management and authentication for Tyk API Gateway. The issue specifically impacts the SAML authentication implementation, which relies on Go's XML parser. When processing SAML assertions, the XML parser doesn't maintain complete integrity between parsing and serialization operations, creating an opportunity for authentication bypass. An attacker could potentially exploit this vulnerability to gain unauthorized access to protected resources by manipulating SAML messages in a way that the parser processes incorrectly, leading to successful authentication without valid credentials.

Remediation

Users should upgrade to Tyk Identity Broker version 1.1.1 or later, which contains fixes for this vulnerability. The fix was implemented in multiple commits (243092965b0f93a95a14cb882b5b9a3df61dd5c0 and 46f70420e0911e4e8b638575e29d394c227c75d0) and was included in pull request #147.

If immediate upgrading is not possible, consider implementing additional authentication layers or verification steps outside of the SAML process to mitigate the risk. Also, monitor authentication logs for suspicious activities that might indicate exploitation attempts.

References

  1. Patch commits:

    • https://github.com/TykTechnologies/tyk-identity-broker/commit/243092965b0f93a95a14cb882b5b9a3df61dd5c0
    • https://github.com/TykTechnologies/tyk-identity-broker/commit/46f70420e0911e4e8b638575e29d394c227c75d0

  2. Pull request with fix:

    • https://github.com/TykTechnologies/tyk-identity-broker/pull/147

  3. Fixed release:

    • https://github.com/TykTechnologies/tyk-identity-broker/releases/tag/v1.1.1

  4. Vulnerability advisory:

    • https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMTYKTECHNOLOGIESTYKIDENTITYBROKER-1089720

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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