CyberRota Analysis
AI-GeneratedA vulnerability in the AshPhoenix framework allows remote clients to manipulate the tenant selection of an Ash application by sending a specially crafted Host header, potentially leading to unauthorized access or request degradation. The issue arises from improper handling of the root domain in regular expressions, which can be exploited through case-sensitive matches and wildcard behavior. Organizations using AshPhoenix versions between 2.1.26 and 2.3.25 should prioritize patching this vulnerability to mitigate risks associated with tenant impersonation and request manipulation.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Permissive Regular Expression vulnerability in ash-project ash_phoenix lets a remote client select the tenant an Ash application uses, or degrade the request, by sending a crafted Host header. AshPhoenix.Helpers.get_subdomain/2 stripped the root domain with String.replace(host, ~r/.?#{root_host}/, ""). The root host was interpolated raw, so each . became a wildcard and any metacharacter a pattern, and the replace was global and unanchored, so a match was removed from anywhere in the string. With root_host example.com, Host: foo.exampleXcom.attacker.net returned the tenant foo.attacker.net. A metacharacter-bearing or nil root host degraded the pattern or raised on every request. The comparison was also case-sensitive, so TENANT.EXAMPLE.COM and EXAMPLE.COM slipped past the root-host allowlist. conn.host comes from the client Host header. The fix matches the root host case-insensitively and only as an exact trailing suffix. This issue affects ash_phoenix: from 2.1.26 before 2.3.25.