CVE-2019-5478 — A weakness was found in Encrypt Only boot mode in Zynq UltraScale+ devices

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / Zynq UltraScale+ SoC	Not Fixed

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-09-03T19:17:35.000Z
• Last modified: 2024-08-04T19:54:53.489Z

09References

• www.xilinx.com — https://www.xilinx.com/support/answers/72588.html
• github.com — https://github.com/inversepath/advisories/blob/master/Security_Advisory-Ref_FSC-…