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CVE-2026-66883: Erlang Ecosystem Foundation oidcc_plug, друго

6.3

CVSS 4.0

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, при специфични условия, само при определена конфигурация или състояние на системата, без вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: има публичен пример за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

Improper Handling of Case Sensitivity vulnerability in Erlang Ecosystem Foundation oidcc_plug (Oidcc.Plug.Authorize module) renders the user agent session binding inert, removing a defense in depth control against replay of a stolen session. This vulnerability is associated with program files lib/oidcc/plug/authorize.ex and lib/oidcc/plug/authorization_callback.ex, and program routines Oidcc.Plug.Authorize.call/2 and Oidcc.Plug.AuthorizationCallback.call/2. Oidcc.Plug.Authorize.call/2 reads the initiating client's user agent with get_req_header(conn, "User-Agent"). Plug lowercases incoming header names, but get_req_header/2 matches the supplied key exactly and performs no normalization of its own, so the mixed-case lookup always returns an empty list and nil is written into the session. On the callback side, Oidcc.Plug.AuthorizationCallback treats a stored nil user agent as nothing to compare and returns :ok without inspecting the request. The two behaviours combine so that the check passes unconditionally on every request, including for deployments that explicitly opted in with check_useragent: true, and an authorization callback can be completed from a different user agent than the one that initiated the flow without detection. The check fails open silently, with no error and no log entry, so a deployment cannot tell the binding is absent. The impact is limited to defense in depth. The inert check does not by itself allow an attacker to complete an authorization flow; it removes one layer that would otherwise hinder use of a stolen or leaked session, such as an exfiltrated session cookie replayed from a different client. The CSRF/state, nonce, and PKCE checks are unaffected and continue to function. Deployments that never enabled check_useragent are not affected in practice, since they never expected the binding. The corresponding lookup in Oidcc.Plug.AuthorizationCallback correctly uses the lowercase key and is not affected. This issue affects oidcc_plug: fro

Засегнати продукти

  • Erlang Ecosystem Foundation oidcc_plug: 0.1.0-alpha.3 преди 0.5.0
  • Erlang Ecosystem Foundation oidcc_plug: 0a75fb139d8e2686d1b75e0d48962323d2181673 преди f15e52c5750aaba701104b10ed96cfac063bd557

Вид слабост

История

  • 4 август 2026 Публикувано

Други уязвимости в Erlang Ecosystem Foundation oidcc_plug

Първоизточници

CVE-2026-66883: Erlang Ecosystem Foundation oidcc_plug, друго | freedomonline.bg