CyberRota Analysis
AI-GeneratedThe ash_authentication_oauth2_server is vulnerable to improper encoding of output, allowing unauthenticated attackers to inject arbitrary authentication parameters into the WWW-Authenticate challenge header. This could lead to unauthorized access to resources by redirecting clients to an attacker-controlled authorization server. Organizations using versions from 0.1.3 to before 0.3.1 should prioritize patching this vulnerability to mitigate potential exploitation in multi-tenant environments.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Improper Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to inject arbitrary authentication parameters into the WWW-Authenticate challenge header. BearerPlug and RequireScopePlug built the Bearer resource_metadata="..." challenge by interpolating a resource_metadata URL derived from the request tenant directly into the quoted value. In a multi-tenant application that sets the Ash tenant from request-controlled data (a subdomain, the Host, a path segment, or a header), a tenant containing a " closes the quoted value and appends attacker-chosen auth-params, including a second resource_metadata URL pointing at an attacker-controlled authorization server that spec-following clients follow. Carriage returns and line feeds are rejected by Plug, so this is parameter injection within one header, not response splitting. This issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.