Asymmetric Key Bypass in jsonwebtoken Node Module by Auth0
CVE-2015-9235

9.8CRITICAL

Key Information:

Vendor

Hackerone

Status
Jsonwebtoken Node Module
Vendor
CVE Published:
29 May 2018

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 32%

What is CVE-2015-9235?

The jsonwebtoken module before version 4.2.2 is susceptible to a security flaw where an attacker can bypass token verification. This occurs when the chamber facilitates the use of tokens signed with asymmetric keys but allows for substitution with tokens signed using symmetric algorithms. Consequently, this vulnerability can result in unauthorized access or manipulation of secured resources due to inadequate validation of claims.

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Affected Version(s)

jsonwebtoken node module <4.2.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2015-9235_JWT_key_confusion
Created by WinDyAlphA

jwt-key-confusion-poc
Created by aalex954

Venom-JWT
Created by z-bool

References

https://nodesecurity.io/advisories/17
x_refsource_MISC
https://github.com/auth0/node-jsonwebtoken/commit/1bb584b...
x_refsource_MISC
https://auth0.com/blog/2015/03/31/critical-vulnerabilitie...
x_refsource_MISC

EPSS Score

32% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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