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GHSA-cq55-c7wv-pxmq
smarty/smartysmarty/smartyWhen a Security policy is active, {fetch} validates the requested remote URL against the trusted_uri allowlist via Security::isTrustedUri(). For non-http:// schemes (e.g. https://) the resource was then read with file_get_contents(), which follows HTTP redirects by default. Because isTrustedUri() only validates the initial URL, an open redirect on an otherwise-trusted host could be used to redirect the request to a non-trusted, internal target — bypassing the trusted_uri policy.
Impact
An attacker who can supply a fetch target (or influence one) and who has an open redirect available on a trusted host can cause the server to issue requests to attacker-chosen internal endpoints, defeating the trusted_uri allowlist (server-side request forgery).
Patches
Fixed in 5.8.2. When a security policy is active, {fetch} now passes a stream context that disables redirect following (follow_location => 0, max_redirects => 1) to file_get_contents() for remote resources. Behavior is unchanged when no security policy is set, since there is no trusted_uri to bypass.
Workarounds
Avoid fetching remote resources from within templates under untrusted control; ensure hosts listed in trusted_uri do not expose open redirects.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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