CVE-2021-27208
Last modified
CVE-2021-27208 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Xilinx | Zynq-7000s Firmware | All versions |
| Xilinx | Zynq-7000 Firmware | All versions |
References
- http://www.onfi.org/specificationsNot Applicable
- https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.htmlProduct, Vendor Advisory
- https://www.xilinx.com/support/answers/76201.htmlVendor Advisory
- http://www.onfi.org/specificationsNot Applicable
- https://www.xilinx.com/products/silicon-devices/soc/zynq-7000.htmlProduct, Vendor Advisory
- https://www.xilinx.com/support/answers/76201.htmlVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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