# CVE-2024-29896: Astro-Shield's Content-Security-Policy header generation in middleware could be compromised by malicious injections

> Attackers can bypass Content Security Policy protections by injecting malicious resources when automated CSP generation is enabled in Astro-Shield.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Mar 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-w387-5qqw-7g8m

## What is CVE-2024-29896?

CVE-2024-29896 is a high-severity vulnerability in KindSpells astro-shield, published on 28 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Astro-Shield is a library to compute the subresource integrity hashes for your JS scripts and CSS stylesheets. When automated CSP headers generation for SSR content is enabled and the web application serves content that can be partially controlled by external users, then it is possible that the CSP headers generation feature might be "allow-listing" malicious injected resources like inlined JS, or references to external malicious scripts. The fix is available in version 1.3.0.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2024-29896?

2 open source packages ship an affected version, including @kindspells/astro-shield. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@kindspells/astro-shield` | npm | From 1.2.0 | 1.3.0 |
| `@kindspells/astro-shield` | npm | From 1.2.0 | 1.3.0 |

Products: Kindspells Astro-Shield.

## How do I fix CVE-2024-29896?

Upgrade @kindspells/astro-shield to 1.3.0 or later.

## Is CVE-2024-29896 being exploited?

There is no known exploitation of CVE-2024-29896 in the wild and no public exploit code.

## Other vulnerabilities in KindSpells astro-shield

- [CVE-2024-30250](https://insights.sbomify.com/CVE-2024-30250/): In Astro-Shield, setting a correct `integrity` attribute to injected code allows to bypass the allow-lists (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-29896 and fix it if it is affected.

What it is: CVE-2024-29896 is a high-severity vulnerability in KindSpells astro-shield, published on 28 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-29896 in the wild and no public exploit code.

Affected packages and fixed versions:
- @kindspells/astro-shield (npm): affected from 1.2.0; fixed in 1.3.0
- @kindspells/astro-shield (npm): affected from 1.2.0; fixed in 1.3.0

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-2024-29896/ (Markdown: https://insights.sbomify.com/CVE-2024-29896/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-29896
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-29896
- OSV: https://osv.dev/vulnerability/CVE-2024-29896

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-29896/
Summaries are generated and may contain mistakes; the official description above is the record.