CVE-2021-44850 Memory corruption in n/a
Physical access allows attackers to modify SD boot images, triggering a ROM buffer overflow to bypass secure boot restrictions and execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-44850?
CVE-2021-44850 is a medium-severity memory corruption vulnerability in n/a, published on 10 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
On Xilinx Zynq-7000 SoC devices, physical modification of an SD boot image allows for a buffer overflow attack in the ROM. Because the Zynq-7000's boot image header is unencrypted and unauthenticated before use, an attacker can modify the boot header stored on an SD card so that a secure image appears to be unencrypted, and they will be able to modify the full range of register initialization values. Normally, these registers will be restricted when booting securely. Of importance to this attack are two registers that control the SD card's transfer type and transfer size. These registers could be modified a way that causes a buffer overflow in the ROM.
Weakness: CWE-345
Which versions are affected by CVE-2021-44850?
It affects 10 products.
Products include Amd Xilinx Z-7007s Firmware, Amd Xilinx Z-7010 Firmware, Amd Xilinx Z-7012s Firmware, Amd Xilinx Z-7014s Firmware, Amd Xilinx Z-7015 Firmware, Amd Xilinx Z-7020 Firmware and 4 more.
How do I fix CVE-2021-44850?
No fix has been published for CVE-2021-44850 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-44850 being exploited?
There is no known exploitation of CVE-2021-44850 in the wild and no public exploit code.
Sources
Also known as GHSA-63r5-j25f-4c6v.