# CVE-2024-1633: FIP Header Integer Overflow

> An integer overflow in the Renesas R-Car bootloader allows attackers to bypass secure boot memory restrictions and write data out of bounds.

- **Severity:** Low 2.0 (`CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Feb 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-wj7c-h9x2-w8cg

## What is CVE-2024-1633?

CVE-2024-1633 is a low-severity vulnerability in Renesas rcar_gen3_v2.5, published on 19 Feb 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

During the secure boot, bl2 (the second stage of
the bootloader) loops over images defined in the table “bl2_mem_params_descs”.
For each image, the bl2 reads the image length and destination from the image’s
certificate. Because of the way of reading from the image, which base on 32-bit unsigned integer value, it can result to an integer overflow. An attacker can bypass memory range restriction and write data out of buffer bounds, which could result in bypass of secure boot.

 Affected git version from c2f286820471ed276c57e603762bd831873e5a17 until (not

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2024-1633?

It affects 1 product.


Products: Renesas Arm-Trusted-Firmware.

## How do I fix CVE-2024-1633?

No fix has been published for CVE-2024-1633 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-1633 being exploited?

There is no known exploitation of CVE-2024-1633 in the wild and no public exploit code.

## Other vulnerabilities in Renesas rcar_gen3_v2.5

- [CVE-2024-6563](https://insights.sbomify.com/CVE-2024-6563/): Buffer Overflow Arbitrary Write (high 7.5)
- [CVE-2024-6564](https://insights.sbomify.com/CVE-2024-6564/): Buffer overflow in Rensas RCAR (medium 6.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-1633 and fix it if it is affected.

What it is: CVE-2024-1633 is a low-severity vulnerability in Renesas rcar_gen3_v2.5, published on 19 Feb 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-1633 in the wild and no public exploit code.

Affected product: Renesas rcar_gen3_v2.5. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2024-1633/ (Markdown: https://insights.sbomify.com/CVE-2024-1633/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-1633
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-1633
- OSV: https://osv.dev/vulnerability/CVE-2024-1633

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-1633/
Summaries are generated and may contain mistakes; the official description above is the record.