CVE-2021-27208

15.03.2021, 13:15

When booting a Zync-7000 SOC device from nand flash memory, the nand driver in the ROM does not validate the inputs when reading in any parameters in the nands parameter page. IF a field read in from the parameter page is too large, this causes a buffer overflow that could lead to arbitrary code execution. Physical access and modification of the board assembly on which the Zynq-7000 SoC device mounted is needed to replace the original NAND flash memory with a NAND flash emulation device for this attack to be successful.

Classic Buffer Overflow

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	6.8 MEDIUM	PHYSICAL	LOW	NONE	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
mitre	CNA	---				---
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 41%

Vendor	Product	Version
xilinx	zynq-7000s_firmware	-
xilinx	zynq-7000_firmware	-

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= Vulnerable software versions

Common Weakness Enumeration

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

References

http://www.onfi.org/specifications

https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html

https://www.xilinx.com/support/answers/76201.html

http://www.onfi.org/specifications

https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html

https://www.xilinx.com/support/answers/76201.html