Authenticated access bypass via unsigned JWT acceptance
Published Jul 26, 2021 · Updated Aug 3, 2024
JWT authentication bypass in NIMBLE Project Common before 3b96cb0293d3443b870351945f41d7d55cb34b53 allows remote authenticated users to forge tokens. ValidationUtil passes received JWTs to the generic parse method, which accepts two-part unsigned tokens instead of requiring a signed three-part JWS. An attacker must reach a NIMBLE service that consumes this utility; a forged token can then impersonate authenticated claims and bypass access checks.
Summary
What happened
JWT authentication bypass in NIMBLE Project Common before 3b96cb0293d3443b870351945f41d7d55cb34b53 allows remote authenticated users to forge tokens. ValidationUtil passes received JWTs to the generic parse method, which accepts two-part unsigned tokens instead of requiring a signed three-part JWS. An attacker must reach a NIMBLE service that consumes this utility; a forged token can then impersonate authenticated claims and bypass access checks.
The record
- CVE
- CVE-2021-32631
- Published
- Jul 26, 2021
- Updated
- Aug 3, 2024
- Vendor
- NIMBLE Project
- Product
- Common
- Classifications
- CWE-290, T1606
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 26, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3b96cb0293d3443b870351945f41d7d55cb34b53
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Unsigned two-part JWT demonstrationproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo