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              "value": "\u003cp\u003eImproper Verification of Cryptographic Signature in ueberauth guardian allows an unauthenticated attacker to revoke a victim\u0027s session with a forged token.\u003c/p\u003e\u003cp\u003e\u003ctt\u003eGuardian.revoke/3\u003c/tt\u003e in \u003ctt\u003elib/guardian.ex\u003c/tt\u003e decodes the supplied token with \u003ctt\u003epeek/1\u003c/tt\u003e, which performs no signature verification (it only base64-decodes the JWT header and payload). The resulting unverified claims are forwarded directly to the configured token module\u0027s \u003ctt\u003erevoke\u003c/tt\u003e callback and the implementation\u0027s \u003ctt\u003eon_revoke\u003c/tt\u003e callback, a state-mutating sink. The sibling operations \u003ctt\u003erefresh/2\u003c/tt\u003e and \u003ctt\u003eexchange/4\u003c/tt\u003e both call \u003ctt\u003edecode_and_verify\u003c/tt\u003e first, so the signature is checked before anything acts on the claims; \u003ctt\u003erevoke/3\u003c/tt\u003e is the only state-mutating path that acts on claims without verifying the signature.\u003c/p\u003e\u003cp\u003eAn attacker who knows or guesses a victim\u0027s identifying claim values (\u003ctt\u003ejti\u003c/tt\u003e, \u003ctt\u003esub\u003c/tt\u003e) can forge a JWT carrying those claims, sign it with an arbitrary key, and submit it to any endpoint that funnels a caller-supplied token into \u003ctt\u003eGuardian.revoke/3\u003c/tt\u003e (the standard logout / session-revocation pattern). When the token module mutates state keyed by the claims (whitelist deletion or blacklist insertion, for example a GuardianDb-style store), the victim\u0027s legitimate session is evicted. This is an unauthenticated session-revocation denial of service; the attacker never needs the signing secret.\u003c/p\u003e\u003cp\u003eThis issue affects guardian: from 1.0.0 before 2.4.1.\u003c/p\u003e"
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