NVD

CVE-2021-27208 Detail

Description

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 nand’s 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.

Severity

CVSS 3.x Severity and Metrics:

NIST: NVD

Base Score: 6.8 MEDIUM

Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
http://www.onfi.org/specifications	Not Applicable
https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html	Product Vendor Advisory
https://www.xilinx.com/support/answers/76201.html	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-120	Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Initial Analysis by NIST 3/18/2021 2:14:20 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		AND OR cpe:2.3:o:xilinx:zynq-7000_firmware:-::::::: OR cpe:2.3:h:xilinx:zynq-7000:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:xilinx:zynq-7000s_firmware:-::::::: OR cpe:2.3:h:xilinx:zynq-7000s:-:::::::*
Added	CVSS V2		NIST (AV:L/AC:L/Au:N/C:P/I:P/A:P)
Added	CVSS V3.1		NIST AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CWE		NIST CWE-120
Changed	Reference Type	http://www.onfi.org/specifications No Types Assigned	http://www.onfi.org/specifications Not Applicable
Changed	Reference Type	https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html No Types Assigned	https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.html Product, Vendor Advisory
Changed	Reference Type	https://www.xilinx.com/support/answers/76201.html No Types Assigned	https://www.xilinx.com/support/answers/76201.html Vendor Advisory

Quick Info

CVE Dictionary Entry:
CVE-2021-27208
NVD Published Date:
03/15/2021
NVD Last Modified:
03/30/2021
Source:
MITRE

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Information Technology Laboratory

National Vulnerability Database