CVE-2024-9666

Summary

A vulnerability was found in the Keycloak Server. The Keycloak Server is vulnerable to a denial of service (DoS) attack due to improper handling of proxy headers. When Keycloak is configured to accept incoming proxy headers, it may accept non-IP values, such as obfuscated identifiers, without proper validation. This issue can lead to costly DNS resolution operations, which an attacker could exploit to tie up IO threads and potentially cause a denial of service. The attacker must have access to send requests to a Keycloak instance that is configured to accept proxy headers, specifically when reverse proxies do not overwrite incoming headers, and Keycloak is configured to trust these headers.

Affected Software

VendorProductVersion RangeStatus
0 < 24.0.9affected
25.0.0 < 26.0.6affected
Red HatRed Hat build of Keycloak 2424.0.9-1 < *unaffected
Red HatRed Hat build of Keycloak 2424-18 < *unaffected
Red HatRed Hat build of Keycloak 2424-18 < *unaffected
Red HatRed Hat build of Keycloak 26.026.0.6-2 < *unaffected
Red HatRed Hat build of Keycloak 26.026.0-5 < *unaffected
Red HatRed Hat build of Keycloak 26.026.0-6 < *unaffected

Weaknesses

  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References