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.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
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 include Eurosoft-Uk Uefi Bootloader, Microsoft Windows 10, Microsoft Windows 11, Microsoft Windows 8.1, Microsoft Windows Rt 8.1, Microsoft Windows Server 2012 and 4 more.
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: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-2hf7-qg9c-qf4h.