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Inversoft Prime-JWT versions before commit abb0d479389a2509f939452a6767dc424bb5e6ba contain an input-validation flaw in JWTDecoder.decode. A crafted JWT using the unsigned "none" algorithm in an otherwise valid header can cause incorrect JWT signature validation.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single Python script, 'jwtbruteforcer.py', which serves as a proof-of-concept tool for testing JWT implementations for the CVE-2018-1000531 vulnerability and for brute-forcing JWT secret keys. The tool first checks if a given JWT token is vulnerable to the 'alg':'none' attack (CVE-2018-1000531) by manipulating the token header and attempting to decode it without signature verification. If the target is not vulnerable, the tool proceeds to brute-force the JWT secret key using a user-supplied wordlist file. The script is interactive, requiring the user to input a JWT token and the path to a wordlist file. The repository is structured simply, with a license, a brief README, and the main exploit script. No network endpoints or hardcoded targets are present; the tool operates locally on user-supplied data.
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