MFA Fuzzing and Json.Unmarshal Panic fix#30854
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This expands the coverage of fuzzing in `lib/web/fuzz_test.go` and includes adding seeds. From this work a new panic was discovered where a pointer is allocated then a pointer to the pointer is passed into json.Unmarshal. It is then possible for this original pointer to remain a `nil` reference. This pattern looks unexpected, so all cases of double pointers being passed into json.Unmarshal were changed to the more standard empty struct pointer style to avoid potential nil reference panics.
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This expands the coverage of fuzzing in
lib/web/fuzz_test.goand includes adding seeds. From this work a new panic was discovered where a pointer is allocated then a pointer to the pointer is passed intojson.Unmarshal. It is then possible for this original pointer to remain anilreference.This pattern looks unexpected, so all cases of double pointers being passed into
json.Unmarshalwere changed to the more standard empty struct pointer style to avoid potential nil reference panics.Originally opened in this PR: https://github.com/gravitational/teleport-private/pull/891 but severity was deemed low enough to fix directly in OSS
Backporting will be done through release PR's already open: