CVE-2021-44850

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

En los dispositivos Xilinx Zynq-7000 SoC, la modificación física de una imagen de arranque de la SD permite un ataque de desbordamiento del búfer en la ROM. Dado que el encabezado de la imagen de arranque del Zynq-7000 no está cifrada ni autenticada antes de su uso, un atacante puede modificar el encabezado de arranque almacenado en una tarjeta SD para que una imagen segura parezca no estar cifrada, y podrá modificar toda la gama de valores de inicialización de registros. Normalmente, estos registros estarán restringidos cuando el arranque sea seguro. De importancia para este ataque son dos registros que controlan el tipo y el tamaño de transferencia de la tarjeta SD. Estos registros podrían modificarse de forma que causen un desbordamiento del búfer en la ROM

*Credits: N/A

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-12-13 CVE Reserved
2022-02-10 CVE Published
2024-08-04 CVE Updated
2024-10-26 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-345: Insufficient Verification of Data Authenticity

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://support.xilinx.com/s/article/47915	2023-08-08
https://support.xilinx.com/s/article/76964	2023-08-08

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Amd Search vendor "Amd"	Xilinx Z-7012s Firmware Search vendor "Amd" for product "Xilinx Z-7012s Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7012s Search vendor "Amd" for product "Xilinx Z-7012s"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7014s Firmware Search vendor "Amd" for product "Xilinx Z-7014s Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7014s Search vendor "Amd" for product "Xilinx Z-7014s"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7010 Firmware Search vendor "Amd" for product "Xilinx Z-7010 Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7010 Search vendor "Amd" for product "Xilinx Z-7010"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7015 Firmware Search vendor "Amd" for product "Xilinx Z-7015 Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7015 Search vendor "Amd" for product "Xilinx Z-7015"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7020 Firmware Search vendor "Amd" for product "Xilinx Z-7020 Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7020 Search vendor "Amd" for product "Xilinx Z-7020"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7030 Firmware Search vendor "Amd" for product "Xilinx Z-7030 Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7030 Search vendor "Amd" for product "Xilinx Z-7030"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7035 Firmware Search vendor "Amd" for product "Xilinx Z-7035 Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7035 Search vendor "Amd" for product "Xilinx Z-7035"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7045 Firmware Search vendor "Amd" for product "Xilinx Z-7045 Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7045 Search vendor "Amd" for product "Xilinx Z-7045"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7100 Firmware Search vendor "Amd" for product "Xilinx Z-7100 Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7100 Search vendor "Amd" for product "Xilinx Z-7100"	-	-	Safe
Amd Search vendor "Amd"	Xilinx Z-7007s Firmware Search vendor "Amd" for product "Xilinx Z-7007s Firmware"	-	-	Affected	in	Amd Search vendor "Amd"	Xilinx Z-7007s Search vendor "Amd" for product "Xilinx Z-7007s"	-	-	Safe