A weakness was found in Encrypt Only boot mode in Zynq UltraScale+ devices. This could lead to an adversary being able to modify the control fields of the boot image leading to an incorrect secure boot behavior.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-5478
• https://github.com/inversepath/advisories/blob/master/Security_Advisory-Ref_FSC-HWSEC-VR2019-0001-Xilinx_ZU+-Encrypt_Only_Secure_Boot_bypass.txt
• https://www.xilinx.com/support/answers/72588.html