# CVE-2022-34303: Security feature bypass in n/a

> Attackers can bypass Secure Boot and execute arbitrary code by replacing the signed bootloader with a vulnerable Eurosoft version.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Aug 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-2hf7-qg9c-qf4h

## What is CVE-2022-34303?

CVE-2022-34303 is a medium-severity vulnerability in Microsoft Windows 10, published on 26 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in Eurosoft bootloaders before 2022-06-01. An attacker may use this bootloader to bypass or tamper with Secure Boot protections. In order to load and execute arbitrary code in the pre-boot stage, an attacker simply needs to replace the existing signed bootloader currently in use with this bootloader. Access to the EFI System Partition is required for booting using external media.

## Which versions are affected by CVE-2022-34303?

It affects 10 products.


Products: Eurosoft-Uk Uefi Bootloader, Microsoft Windows 10, Microsoft Windows 11, Microsoft Windows 8.1, Microsoft Windows Rt 8.1, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Redhat Enterprise Linux.

## How do I fix CVE-2022-34303?

Apply the vendor's patch.

## Is CVE-2022-34303 being exploited?

There is no known exploitation of CVE-2022-34303 in the wild and no public exploit code.

Public exploit code:

- CVE-2022-34303 - Secure Boot bypass via CryptoPro Secure Disk signed UEFI Shell (Shell_Full.efi) - BYOVUA technique exploiting mm command for gSecurity2 corruption to load unsigned UEFI applications. (github_poc): https://github.com/TheMalwareGuardian/CVE-2022-34303

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-34303 and fix it if it is affected.

What it is: CVE-2022-34303 is a medium-severity vulnerability in Microsoft Windows 10, published on 26 Aug 2022. 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-2022-34303 in the wild and no public exploit code.

Affected product: Microsoft Windows 10. 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-2022-34303/ (Markdown: https://insights.sbomify.com/CVE-2022-34303/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-34303
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-34303
- OSV: https://osv.dev/vulnerability/CVE-2022-34303

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-34303/
Summaries are generated and may contain mistakes; the official description above is the record.