CVE-2018-1000539: Improper Verification of Cryptographic Signature

Nov json-jwt version = 0.5.0 && 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM encrypted JSON Web Tokens that can result in Attacker can forge a authentication tag. This attack appear to be exploitable via network connectivity. Th...

Authentication Bypass

json-jwt is vulnerable to authentication bypasses. The library does not properly validate the GCM auth tag length, allowing a malicious user to require at most 256 attempts to forge a valid auth tag...

Auth tag forgery vulnerability with AES-GCM encrypted JWT

Ruby's OpenSSL bindings do not check the length of the supplied authentication tag when decrypting an authenticated encryption mode such as AES-GCM, leaving this up to the authors of a gem/app to implement for properly validating the message. json-jwt was not checking for the authentication tag...

Denial Of Service (DoS)

json-jwt is vulnerable to denial of service DoS attacks. A malicious attacker can cause a denial of service when decoding the jwt-json signatures. This is unsafe because the tokens are stored as symbols that allocates memory to a string but is not removed by the garbage collection after being use...

Timing Attack

json-jwt is vulnerable to timing attacks. The library is vulnerable because they do not compare signatures in constant-time, which allows malicious users to use the timing of the request to progressively identify a valid signatures...