CVE-2025-7623
📋 TL;DR
This vulnerability allows authenticated attackers with SSH access to the BMC to execute arbitrary code via a stack buffer overflow in the SMASH-CLP shell. It affects systems using Supermicro BMC firmware with vulnerable SMASH implementations. Attackers can gain full control of the BMC operating system.
💻 Affected Systems
- Supermicro BMC firmware with SMASH-CLP shell
⚠️ 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 compromise of BMC firmware allowing persistent backdoor, credential theft, and lateral movement to host systems.
Likely Case
Attacker with existing SSH access to BMC gains elevated privileges and can manipulate hardware management functions.
If Mitigated
Limited impact if SSH access to BMC is restricted and proper network segmentation is in place.
🎯 Exploit Status
Requires authenticated SSH access and knowledge of SMASH commands. Stack buffer overflow exploitation requires specific memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Supermicro advisory for specific patched firmware versions.
Vendor Advisory: https://www.supermicro.com/zh_tw/support/security_BMC_IPMI_Nov_2025
Restart Required: Yes
Instructions:
1. Identify BMC firmware version. 2. Download patched firmware from Supermicro support portal. 3. Follow Supermicro's BMC firmware update procedure. 4. Reboot BMC after update.
🔧 Temporary Workarounds
Disable SSH access to BMC
allPrevent exploitation by disabling SSH service on BMC interfaces.
ipmitool lan set <channel> ipsrc static
ipmitool lan set <channel> access on
Restrict network access to BMC
linuxLimit BMC network exposure to management networks only using firewall rules.
iptables -A INPUT -s <trusted_network> -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate BMC management interfaces
- Disable SSH on BMC and use alternative management methods if possible
🔍 How to Verify
Check if Vulnerable:
Check BMC firmware version against Supermicro's advisory. Use: ipmitool mc info | grep 'Firmware Revision'Check Version:
ipmitool mc info | grep 'Firmware Revision'Verify Fix Applied:
Verify firmware version matches patched version from Supermicro advisory after update.📡 Detection & Monitoring
Log Indicators:
- Unusual SSH connections to BMC IP
- SMASH command execution errors in BMC logs
- BMC process crashes
Network Indicators:
- SSH traffic to BMC on non-standard ports
- Multiple failed SSH attempts followed by successful login
SIEM Query:
source="bmc_logs" AND ("SMASH" OR "buffer overflow") OR dest_ip="BMC_IP" AND protocol="ssh"