Authentication bypass via acceptance of unsigned JWTs
Published Apr 16, 2021 · Updated Aug 3, 2024
Improper JWT signature verification in ManyDesigns Portofino before 5.2.1 allows remote attackers to bypass authentication. JWTRealm and AbstractPortofinoRealm call JJWT's generic parse method, which accepts a two-part unsigned token instead of requiring parseClaimsJws. No credentials or user interaction are required; a forged token supplies attacker-chosen claims and gains the access assigned to the impersonated principal.
Summary
What happened
Improper JWT signature verification in ManyDesigns Portofino before 5.2.1 allows remote attackers to bypass authentication. JWTRealm and AbstractPortofinoRealm call JJWT's generic parse method, which accepts a two-part unsigned token instead of requiring parseClaimsJws. No credentials or user interaction are required; a forged token supplies attacker-chosen claims and gains the access assigned to the impersonated principal.
The record
- CVE
- CVE-2021-29451
- Published
- Apr 16, 2021
- Updated
- Aug 3, 2024
- Vendor
- ManyDesigns
- Product
- Portofino
- Classifications
- CWE-347, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 16, 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
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 5.0.0, < 5.2.1
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.
Weakness, pattern, technique
Public exploit references
- Unsigned two-part JWT proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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