CVE-2021-26573
📋 TL;DR
A buffer overflow vulnerability in HPE Apollo 70 System BMC firmware allows local attackers to execute arbitrary code or cause denial of service. This affects systems running BMC firmware versions prior to 3.0.14.0. Attackers with local access to the BMC interface can exploit this vulnerability.
💻 Affected Systems
- HPE Apollo 70 System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the BMC, allowing persistent access, firmware modification, and potential lateral movement to the host system.
Likely Case
Local privilege escalation on the BMC, enabling unauthorized configuration changes, credential theft, or denial of service.
If Mitigated
Limited impact if BMC is isolated on management network with strict access controls and monitoring.
🎯 Exploit Status
Requires local access to BMC interface. Buffer overflow in SSL configuration function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.14.0 or later
Vendor Advisory: https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf04080en_us
Restart Required: Yes
Instructions:
1. Download firmware update from HPE Support Portal. 2. Upload to BMC via web interface or iLO. 3. Apply firmware update. 4. Reboot BMC after installation.
🔧 Temporary Workarounds
Restrict BMC Network Access
allIsolate BMC management interface to dedicated management network with strict firewall rules.
Disable Unused BMC Services
allDisable web interface or SSL configuration features if not required.
🧯 If You Can't Patch
- Implement strict network segmentation for BMC management interfaces
- Enable detailed logging and monitoring of BMC access attempts
🔍 How to Verify
Check if Vulnerable:
Check BMC firmware version via web interface or SSH: ssh admin@bmc-ip 'show version'Check Version:
ssh admin@bmc-ip 'show version' | grep FirmwareVerify Fix Applied:
Verify firmware version is 3.0.14.0 or higher using same command.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts to BMC
- Unusual BMC configuration changes
- Buffer overflow error messages in BMC logs
Network Indicators:
- Unusual traffic patterns to BMC management port (default 443/22)
- SSL configuration requests to vulnerable endpoint
SIEM Query:
source="bmc_logs" AND (event_type="authentication_failure" OR event_type="buffer_overflow")