# CVE-2021-29451: Missing validation of JWT signature in `ManyDesigns/Portofino`


- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 16 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6g3c-2mh5-7q6x

## What is CVE-2021-29451?

CVE-2021-29451 is a critical vulnerability in ManyDesigns Portofino, published on 16 Apr 2021. 

### Official description

Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2021-29451?

4 open source packages ship an affected version, including com.manydesigns:portofino-core and com.manydesigns:portofino-dispatcher. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `com.manydesigns:portofino-core` | Maven | From 5.0.0 | 5.2.1 |
| `com.manydesigns:portofino-core` | Maven | From 5.0.0 | 5.2.1 |
| `com.manydesigns:portofino-dispatcher` | Maven | From 5.0.0 | 5.2.1 |
| `com.manydesigns:portofino-dispatcher` | Maven | From 5.0.0 | 5.2.1 |

Products: Manydesigns Portofino.

## How do I fix CVE-2021-29451?

Upgrade com.manydesigns:portofino-core to 5.2.1 or later.

## Is CVE-2021-29451 being exploited?

There is no known exploitation of CVE-2021-29451 in the wild and no public exploit code.

## Other vulnerabilities in ManyDesigns Portofino

- [CVE-2022-3952](https://insights.sbomify.com/CVE-2022-3952/): ManyDesigns Portofino WarFileLauncher.java createTempDir temp file (low 2.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-29451 and fix it if it is affected.

What it is: CVE-2021-29451 is a critical vulnerability in ManyDesigns Portofino, published on 16 Apr 2021. 
Exploitation: There is no known exploitation of CVE-2021-29451 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.manydesigns:portofino-core (Maven): affected from 5.0.0; fixed in 5.2.1
- com.manydesigns:portofino-core (Maven): affected from 5.0.0; fixed in 5.2.1
- com.manydesigns:portofino-dispatcher (Maven): affected from 5.0.0; fixed in 5.2.1
- com.manydesigns:portofino-dispatcher (Maven): affected from 5.0.0; fixed in 5.2.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-29451/ (Markdown: https://insights.sbomify.com/CVE-2021-29451/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-29451
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-29451
- OSV: https://osv.dev/vulnerability/CVE-2021-29451

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-29451/
Summaries are generated and may contain mistakes; the official description above is the record.