CVE-2021-0070
📋 TL;DR
This vulnerability allows an unauthenticated attacker with adjacent network access to exploit improper input validation in the BMC firmware of Intel Server Board M10JNP2SB, potentially enabling privilege escalation. It affects servers running BMC firmware versions before 8100.01.08 and EFI BIOS before 7215. Attackers must be on the same local network segment as the vulnerable server.
💻 Affected Systems
- Intel Server Board M10JNP2SB
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full administrative control over the server's baseboard management controller, allowing them to modify firmware, install persistent malware, or completely compromise the physical server hardware.
Likely Case
An attacker with internal network access gains BMC administrative privileges, enabling them to reboot servers, modify boot settings, or access console output without proper authentication.
If Mitigated
With proper network segmentation and access controls, the attack surface is limited to authorized administrative networks only, significantly reducing the risk of exploitation.
🎯 Exploit Status
Exploitation requires adjacent network access and knowledge of BMC network interfaces. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BMC firmware 8100.01.08 and EFI BIOS 7215
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00474.html
Restart Required: Yes
Instructions:
1. Download the updated firmware from Intel's support site. 2. Follow Intel's firmware update procedures for the M10JNP2SB server board. 3. Apply both BMC firmware update to 8100.01.08 and EFI BIOS update to 7215. 4. Reboot the server after firmware updates.
🔧 Temporary Workarounds
Network Segmentation
allIsolate BMC management interfaces to a dedicated, restricted network segment accessible only to authorized administrators.
Access Control Lists
allImplement network ACLs to restrict access to BMC management ports (typically 623/udp for IPMI) to authorized IP addresses only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate BMC interfaces from general network traffic
- Monitor BMC network traffic for unauthorized access attempts and implement intrusion detection
🔍 How to Verify
Check if Vulnerable:
Check BMC firmware version via IPMI tools: ipmitool mc info | grep 'Firmware Revision' and compare to 8100.01.08. Check BIOS version via system BIOS or OS utilities.Check Version:
ipmitool mc info | grep 'Firmware Revision' for BMC; dmidecode -t bios for BIOS version on LinuxVerify Fix Applied:
Verify BMC firmware version is 8100.01.08 or higher and EFI BIOS version is 7215 or higher using the same commands.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts to BMC interface
- Unexpected BMC configuration changes
- BMC firmware modification events
Network Indicators:
- Unauthorized IP addresses accessing port 623/udp (IPMI)
- Unusual BMC protocol traffic patterns
SIEM Query:
source_ip NOT IN (authorized_admin_ips) AND dest_port=623 AND protocol=UDP