CVE-2023-20555 — Insufficient input validation in CpmDisplayFeatureSmm may allow an attacker to c

Insufficient input validation in CpmDisplayFeatureSmm may allow an attacker to corrupt SMM memory by overwriting an arbitrary bit in an attacker-controlled pointer potentially leading to arbitrary code execution in SMM.

01What is this vulnerability?

Insufficient input validation in CpmDisplayFeatureSmm may allow an attacker to corrupt SMM memory by overwriting an arbitrary bit in an attacker-controlled pointer potentially leading to arbitrary code execution in SMM.

02Affected products

Vendor	Product	Versions
AMD	Ryzen™ 3000 Series Desktop Processors “Matisse” AM4	various
AMD	Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4	various
AMD	Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics “Cezanne” AM4	various
AMD	Ryzen™ 7000 Series Processors “Raphael”	various
AMD	Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics “Picasso”	various
AMD	Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics “Renoir” FP5	various
AMD	Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” FP5	various
AMD	Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock”	various
AMD	Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics “Picasso”	various
AMD	Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics “Renoir” FP6	various
AMD	Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne”	various
AMD	Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Cezanne”	various
AMD	Ryzen™ 6000 Series Mobile Processors "Rembrandt"	various
AMD	Ryzen™ 7030 Series Mobile Processors “Barcelo”	various
AMD	Ryzen™ 7020 Series Mobile Processors “Mendocino”	various

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: 2023-08-08T17:07:24.476Z
• Last modified: 2024-10-24T14:36:35.845Z

09References

• www.amd.com — https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4003