📄 Description (English)
Bitdefender Napoca bare-metal hypervisor contains an out-of-bounds write vulnerability in the BIOS INT 0x15 / E820 memory map handler, implemented in napoca/guests/bios_handlers.c. The handler computes a destination offset into the guest RealModeMemory buffer from guest-controlled ES and EDI register values without validating that the resulting address remains within the 1MB RealModeMemory allocation. A malicious guest operating in real mode can trigger the issue by invoking INT 0x15 with AX=0xE820, EDX=0x534D4150, ECX greater than or equal to 20, EBX=0, ES=0xFFFF, and EDI=0xFFFF. This can cause a write of up to 20 bytes past the end of the RealModeMemory buffer into the hypervisor heap. The product is end-of-life and unsupported when assigned.
🤖 AI Executive Summary
Bitdefender Napoca bare-metal hypervisor contains a critical out-of-bounds write vulnerability in the BIOS INT 0x15 E820 memory map handler that allows malicious guest VMs to write up to 20 bytes into the hypervisor heap. This vulnerability affects end-of-life products with no available patches, requiring immediate decommissioning or isolation of affected systems. The lack of exploit availability provides limited window for remediation before potential weaponization.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Jun 9, 2026 01:37
🇸🇦 Saudi Arabia Impact Assessment
Saudi government and critical infrastructure organizations using Bitdefender Napoca for virtualization face severe risk of hypervisor compromise. Primary impact sectors: (1) Government/NCA — virtualized security infrastructure and classified systems; (2) Banking/SAMA — virtualized banking platforms and payment processing systems; (3) Energy/ARAMCO — virtualized SCADA and operational technology environments; (4) Telecom/STC — virtualized network infrastructure and core services. A compromised hypervisor enables complete guest VM escape, lateral movement, and persistent access to all virtualized systems. Given Saudi Arabia's critical infrastructure reliance on virtualization, this poses national security implications.
🏢 Affected Saudi Sectors
Government/NCA
Banking/SAMA
Energy/ARAMCO
Telecom/STC
Healthcare
Critical Infrastructure
Defense/Military
🎯 MITRE ATT&CK Techniques
T1548 — Abuse Elevation Control Mechanism (hypervisor privilege escalation)
T1190 — Exploit Public-Facing Application (guest-to-hypervisor escape)
T1055 — Process Injection (hypervisor heap corruption)
T1542.003 — Pre-OS Boot (BIOS INT 0x15 handler manipulation)
T1542.005 — Bootkit (persistent hypervisor compromise)
T1578.003 — Modify Cloud Compute Infrastructure (guest VM escape to hypervisor)
T1199 — Trusted Relationship (compromised hypervisor affecting all guest VMs)
⚖️ Saudi Risk Score (AI)
8.9
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running Bitdefender Napoca using asset inventory and vulnerability scanning tools
2. Isolate affected hypervisors from production networks immediately
3. Disable guest VM execution on affected systems until remediation is complete
4. Implement network segmentation to prevent guest-to-hypervisor communication
PATCHING GUIDANCE:
1. No patches are available for this end-of-life product
2. Migrate to supported hypervisor solutions (KVM, Hyper-V, VMware ESXi with current patches)
3. Plan immediate decommissioning of Bitdefender Napoca infrastructure
4. Establish migration timeline with maximum 30-day window for critical systems
COMPENSATING CONTROLS:
1. Implement strict guest VM access controls and disable real-mode operations where possible
2. Deploy hypervisor-level monitoring for INT 0x15 calls and memory access violations
3. Implement memory protection mechanisms (DEP/NX) at hypervisor level
4. Restrict guest VM privileges and disable direct hardware access
5. Monitor hypervisor heap for unauthorized writes using kernel debugging tools
DETECTION RULES:
1. Monitor for INT 0x15 calls with AX=0xE820, EDX=0x534D4150, ES=0xFFFF, EDI=0xFFFF
2. Alert on any guest VM executing real-mode BIOS interrupt handlers
3. Monitor hypervisor heap corruption indicators and memory access violations
4. Track guest VM process execution attempting direct memory access
5. Implement hypervisor-level logging for all E820 memory map requests
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تقوم بتشغيل Bitdefender Napoca باستخدام أدوات المسح
2. عزل المراقبات الفائقة المتأثرة عن شبكات الإنتاج فوراً
3. تعطيل تنفيذ أنظمة الضيف على الأنظمة المتأثرة
4. تطبيق تقسيم الشبكة لمنع الاتصال بين الضيف والمراقب
إرشادات التصحيح:
1. لا توجد تصحيحات متاحة لهذا المنتج المنتهي الدعم
2. الترحيل إلى حلول مراقبة مدعومة (KVM, Hyper-V, VMware ESXi)
3. التخطيط لإيقاف فوري لبنية Bitdefender Napoca
4. إنشاء جدول زمني للترحيل بحد أقصى 30 يوماً للأنظمة الحرجة
الضوابط البديلة:
1. تطبيق ضوابط صارمة على وصول أنظمة الضيف وتعطيل العمليات في الوضع الحقيقي
2. نشر المراقبة على مستوى المراقب الفائق لاستدعاءات INT 0x15
3. تطبيق آليات حماية الذاكرة على مستوى المراقب الفائق
4. تقييد امتيازات أنظمة الضيف وتعطيل الوصول المباشر للأجهزة
5. مراقبة ذاكرة المراقب الفائق للكتابة غير المصرح بها
قواعد الكشف:
1. مراقبة استدعاءات INT 0x15 بمعاملات محددة
2. تنبيهات على تنفيذ معالجات BIOS في الوضع الحقيقي
3. مراقبة مؤشرات تلف ذاكرة المراقب الفائق
4. تتبع محاولات الوصول المباشر للذاكرة
5. تطبيق تسجيل شامل لجميع طلبات خريطة الذاكرة E820
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.1.1 — Information security perimeter controls (hypervisor isolation)
ECC 2024 A.12.2.1 — User endpoint device management (guest VM security)
ECC 2024 A.12.4.1 — Event logging and monitoring (hypervisor event detection)
ECC 2024 A.14.2.1 — System development and change management (hypervisor patching/replacement)
🔵 SAMA CSF
SAMA CSF ID.AM-2 — Asset Management (identify and track Napoca systems)
SAMA CSF PR.AC-1 — Access Control (restrict guest VM privileges)
SAMA CSF DE.CM-1 — Detection and Analysis (monitor hypervisor heap)
SAMA CSF RS.MI-2 — Incident Response (isolation and containment procedures)
🟡 ISO 27001:2022
ISO 27001:2022 A.5.23 — Information security for supplier relationships (vendor support status)
ISO 27001:2022 A.8.1 — User endpoint devices (guest VM security controls)
ISO 27001:2022 A.8.3 — Segregation of networks (hypervisor isolation)
ISO 27001:2022 A.12.4.1 — Event logging (hypervisor monitoring and alerting)
🟣 PCI DSS v4.0.1
PCI DSS 2.4 — Maintain inventory of system components (identify Napoca systems in payment environments)
PCI DSS 6.2 — Security patches (no patches available — requires decommissioning)
PCI DSS 10.2 — Implement automated audit trails (hypervisor-level logging)
PCI DSS 12.2 — Implement risk assessment process (end-of-life product assessment)
📦 Affected Products / CPE 1 entries
bitdefender:napoca