A vulnerability was found in jwt-simple up to 0.3.0 on Node.js (JavaScript Library). It has been declared as critical. This vulnerability affects the function jwt.decode. The manipulation with an unknown input leads to a cryptographic issues vulnerability. The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Since "algorithm" isn't enforced in jwt.decode()in jwt-simple 0.3.0 and earlier, a malicious user could choose what algorithm is sent sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA's public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.

The bug was discovered 10/31/2016. The weakness was presented 05/31/2018 (Website). The advisory is available at auth0.com. This vulnerability was named CVE-2016-10555 since 10/29/2017. The exploitation appears to be easy. The attack can be initiated remotely. The requirement for exploitation is a single authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1600 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 577 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

See VDB-118300 for similar entry.

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Type

• JavaScript Library

Name

• jwt-simple

Version

• 0.1
• 0.2
• 0.3

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