CVE-2023-25531
📋 TL;DR
This vulnerability in NVIDIA DGX H100 BMC's IPMI allows attackers to exploit insufficient credential protection, potentially leading to code execution, denial of service, information disclosure, or privilege escalation. It affects users of NVIDIA DGX H100 systems with vulnerable BMC firmware. Exploitation requires network access to the BMC interface.
💻 Affected Systems
- NVIDIA DGX H100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full control over the BMC, executes arbitrary code, disrupts system operations, steals sensitive credentials, and escalates privileges to compromise the entire DGX H100 system.
Likely Case
Attackers with network access to the BMC may exploit this to steal credentials or cause denial of service, leading to operational downtime and potential data exposure.
If Mitigated
With proper network segmentation and access controls, the impact is limited to isolated BMC incidents, preventing broader system compromise.
🎯 Exploit Status
Exploitation may not require authentication, making it easier for attackers with network access; refer to NVIDIA advisory for specific details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check NVIDIA advisory for specific BMC firmware version
Vendor Advisory: https://nvidia.custhelp.com/app/answers/detail/a_id/5473
Restart Required: Yes
Instructions:
1. Review NVIDIA advisory at the provided URL. 2. Download the updated BMC firmware from NVIDIA. 3. Apply the firmware update following NVIDIA's instructions. 4. Restart the BMC to activate the patch.
🔧 Temporary Workarounds
Restrict BMC Network Access
linuxLimit access to the BMC IPMI interface to trusted networks only using firewall rules.
iptables -A INPUT -p tcp --dport 623 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 623 -j DROP
🧯 If You Can't Patch
- Isolate the BMC on a dedicated, restricted network segment to minimize exposure.
- Monitor BMC logs for suspicious activity and implement strong authentication mechanisms if supported.
🔍 How to Verify
Check if Vulnerable:
Check the BMC firmware version via IPMI tools (e.g., ipmitool) and compare against the patched version in the NVIDIA advisory.Check Version:
ipmitool mc info | grep 'Firmware Revision'Verify Fix Applied:
After patching, verify the BMC firmware version has been updated to the patched version using ipmitool or similar.📡 Detection & Monitoring
Log Indicators:
- Unusual IPMI authentication failures or successes from untrusted sources in BMC logs
- Unexpected BMC configuration changes
Network Indicators:
- Anomalous traffic to BMC IPMI port (default 623) from unauthorized IPs
- Suspicious IPMI command sequences
SIEM Query:
source="bmc_logs" AND (event_type="authentication_failure" OR event_type="configuration_change") | stats count by src_ip