CVE-2025-7704
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code on Supermicro BMC systems by exploiting a stack-based buffer overflow in the Insyde SMASH shell program. It affects Supermicro servers with vulnerable BMC firmware versions. Attackers could potentially gain control of the BMC, which manages server hardware remotely.
💻 Affected Systems
- Supermicro servers with BMC/IPMI functionality
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full BMC compromise leading to persistent remote access, hardware manipulation, and potential host OS compromise via BMC-to-host interfaces.
Likely Case
BMC compromise allowing unauthorized access to server management functions, but not necessarily host OS access without additional vulnerabilities.
If Mitigated
Limited impact due to network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
Requires SMASH shell access credentials or another vulnerability to reach the vulnerable component. Stack-based overflow suggests reliable exploitation is possible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Supermicro advisory for specific fixed firmware versions
Vendor Advisory: https://www.supermicro.com/en/support/security_BMC_IPMI_Oct_2025
Restart Required: Yes
Instructions:
1. Identify BMC firmware version. 2. Download updated firmware from Supermicro support portal. 3. Follow Supermicro's BMC firmware update procedure. 4. Reboot the BMC after update.
🔧 Temporary Workarounds
Disable SMASH shell access
allDisable the SMASH shell interface in BMC configuration if not required for operations.
Configuration varies by BMC model; use IPMI or web interface to disable SMASH/CLI access
Restrict network access to BMC
allImplement network segmentation to limit BMC access to authorized management networks only.
Use firewall rules to restrict TCP/UDP ports 623 (IPMI), 443 (HTTPS), 22 (SSH) to trusted IPs
🧯 If You Can't Patch
- Implement strict network segmentation to isolate BMC interfaces from untrusted networks
- Enforce strong authentication and limit SMASH shell access to essential personnel only
🔍 How to Verify
Check if Vulnerable:
Check BMC firmware version against Supermicro's advisory. Use IPMI command 'ipmitool mc info' or web interface to view firmware version.Check Version:
ipmitool mc info | grep 'Firmware Revision'Verify Fix Applied:
Confirm firmware version matches or exceeds the patched version listed in Supermicro advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual SMASH shell access attempts
- Failed authentication followed by SMASH shell commands
- BMC crash or restart logs
Network Indicators:
- Unusual traffic to BMC IPMI ports (623/tcp,udp) from unauthorized sources
- SMASH protocol anomalies
SIEM Query:
source="BMC" AND (event="authentication_failure" OR event="shell_access")