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fix(csrf): safely validate decoded token table and fields - #14025
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bhuvan-somisetty wants to merge 1 commit into
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bhuvan-somisetty wants to merge 1 commit into
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In `apisix/plugins/csrf.lua`, `check_csrf_token` decodes the base64 token into JSON without verifying that the result is a table. When a client supplies a token decoding to a JSON primitive (e.g. number, boolean, null), indexing fields like `token_table["random"]` raises an unhandled Lua runtime error (e.g. `attempt to index a number value`), causing a 500 error. This commit verifies `type(token_table) == "table"` and checks that `random`, `expires`, and `sign` have valid types, safely returning `false` on invalid tokens. Signed-off-by: bhuvan-somisetty <somisettybhuvan5@gmail.com>
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Description
In
apisix/plugins/csrf.lua,check_csrf_tokendecodes the base64 token into JSON without verifying that the result is a table. When a client supplies a token decoding to a JSON primitive (e.g. number, boolean, null), indexing fields liketoken_table["random"]raises an unhandled Lua runtime error (e.g.attempt to index a number value), causing an HTTP 500 error instead of cleanly rejecting the request.This PR:
type(token_table) == "table"after JSON decoding.random,expires, andsignare present with valid scalar types.t/plugin/csrf.tverifying that non-table JSON tokens and invalid fields are rejected with HTTP 401 without crashing.Which issue(s) this PR fixes:
Fixes #14024
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