Inversoft prime-jwt up to 1.3.0 Signature JWTDecoder.decode input validation

Summaryinfo

A vulnerability described as critical has been identified in Inversoft prime-jwt up to 1.3.0. The impacted element is an unknown function of the file JWTDecoder.decode of the component Signature Handler. The manipulation results in input validation. This vulnerability is reported as CVE-2018-1000125. The attack can be launched remotely. No exploit exists. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability classified as critical has been found in Inversoft prime-jwt up to 1.3.0. Affected is an unknown code block of the file JWTDecoder.decode of the component Signature Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

inversoft prime-jwt version prior to version 1.3.0 or prior to commit 0d94dcef0133d699f21d217e922564adbb83a227 contains an input validation vulnerability in JWTDecoder.decode that can result in a JWT that is decoded and thus implicitly validated even if it lacks a valid signature. This attack appear to be exploitable via an attacker crafting a token with a valid header and body and then requests it to be validated. This vulnerability appears to have been fixed in 1.3.0 and later or after commit 0d94dcef0133d699f21d217e922564adbb83a227.

The bug was discovered 01/30/2018. The weakness was disclosed 03/13/2018 (GitHub Repository). The advisory is available at github.com. This vulnerability is traded as CVE-2018-1000125 since 03/13/2018. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 42 days. During that time the estimated underground price was around $0-$5k.

Applying the patch 0d94dcef0133d699f21d217e922564adbb83a227 is able to eliminate this problem.

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Productinfo

Vendor

• Inversoft

Name

• prime-jwt

Version

• 1.0
• 1.1
• 1.2
• 1.3.0

Website

• Product: https://github.com/inversoft/prime-jwt/

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