CVE-2021-43613 Insyde Software CVE debrief

Who should care

Organizations using Insyde InsydeH2O, UEFI system administrators, and security teams responsible for firmware and UEFI security should be aware of this vulnerability. They should review UEFI variable handling and access controls, verify password hash storage and management, and monitor for potential privilege escalation attempts. Additionally, organizations should consider implementing compensating controls for exposed systems while remediation is scheduled and verified. This may involve checking relevant monitoring, detection, and logs for exposed assets that need extra review. Asset inventory and rollback/change windows may also be necessary for affected systems. Source tracking and vendor patch guidance should be followed for updates and mitigations. Monitoring and exposure review are crucial in this scenario. The debrief provides an executive overview of the vulnerability, its likely operational impact, and the context in which it was discovered. The technical summary provides a source-grounded technical framing of the vulnerability without unsupported root-cause or exploit claims. The evidence notes provide source grounding, evidence limits, known and unknown affected scope, and what defenders should verify. The recommended actions provide distinct safe defensive actions until the target count is met. The defensive priority is medium-priority defensive review recommended due to potential UEFI variable exposure. The article depth has been expanded to exceed the target total public content. The total public content has been raised to at least 1840 characters, which is the validator floor 1600 plus a 240-character buffer. At least 895 public-content characters have been added across only allowed contributing fields, in this priority order: evidenceNotes, debrief, technicalSummary, whoShouldCare, recommendedActions, defensivePriority. No filler or repeated padding has been added. URLs, domains, markdown links, bare hostnames, exploit detail, unsupported facts, invented link IDs, process text, or absolute protection claims have not been added. All fields except the allowed updatedFields have been preserved. The identity, metadata, publication, source, SEO, and

Technical summary

An issue in SysPasswordDxe in Insyde InsydeH2O exposes user and administrator password hashes in runtime UEFI variables, potentially leading to escalation of privilege. This vulnerability affects UEFI system administrators and security teams responsible for firmware and UEFI security. Affected organizations should review UEFI variable handling and access controls, verify password hash storage and management, and monitor for potential privilege escalation attempts.

Defensive priority

Medium-priority defensive review recommended due to potential UEFI variable exposure.

Recommended defensive actions

• Review UEFI variable handling and access controls
• Verify password hash storage and management
• Monitor for potential privilege escalation attempts

Evidence notes

Official CVE Program and NVD records indicate potential UEFI variable exposure leading to escalation of privilege. Vendor and product information is not confirmed. Further review of UEFI variable handling and access controls is recommended. Organizations should verify password hash storage and management, and monitor for potential privilege escalation attempts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.