Bypassing Authentication in mod_auth_mellon via Special HTTP Headers

CVE-2019-3878 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.

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