CVE-2024-41660
📋 TL;DR
CVE-2024-41660 is a critical buffer overflow vulnerability in slpd-lite, a unicast SLP UDP server included by default in OpenBMC builds. Attackers can send specially crafted SLP packets to UDP port 427 to trigger memory corruption, potentially leading to remote code execution or denial of service. All OpenBMC systems with the slpd-lite package installed are affected, which is the default configuration.
💻 Affected Systems
- OpenBMC-based systems
⚠️ 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
Remote code execution with root privileges on the BMC, allowing complete system compromise, persistent backdoors, and potential lateral movement to connected systems.
Likely Case
Denial of service causing BMC unavailability, requiring physical intervention to restore management functionality.
If Mitigated
Limited impact if network segmentation prevents access to UDP port 427 from untrusted networks.
🎯 Exploit Status
Exploitation requires only network access to UDP port 427 with no authentication. The CWE-120 (buffer overflow) classification suggests straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest openbmc/slpd-lite repository version
Vendor Advisory: https://github.com/openbmc/slpd-lite/security/advisories/GHSA-wmgv-jffg-v3xr
Restart Required: Yes
Instructions:
1. Update to latest slpd-lite package from openbmc repository. 2. Restart slpd-lite service or reboot BMC. 3. Verify patch is applied and service is running.
🔧 Temporary Workarounds
Block UDP port 427
linuxPrevent access to vulnerable service using firewall rules
iptables -A INPUT -p udp --dport 427 -j DROP
iptables -A INPUT -p udp --dport 427 -s trusted_networks -j ACCEPT
Disable slpd-lite service
linuxStop and disable the vulnerable service if SLP functionality is not required
systemctl stop slpd-lite
systemctl disable slpd-lite
🧯 If You Can't Patch
- Implement strict network segmentation to isolate BMC management interfaces from untrusted networks
- Deploy network-based intrusion prevention systems (IPS) with rules to detect and block SLP protocol anomalies
🔍 How to Verify
Check if Vulnerable:
Check if slpd-lite package is installed and UDP port 427 is listening: 'dpkg -l | grep slpd-lite' and 'netstat -tulpn | grep :427'Check Version:
dpkg -l | grep slpd-lite || rpm -qa | grep slpd-liteVerify Fix Applied:
Verify slpd-lite package version is updated and service is running with patch: 'slpd-lite --version' and 'systemctl status slpd-lite'📡 Detection & Monitoring
Log Indicators:
- slpd-lite service crashes or restarts in system logs
- Unusual UDP traffic to port 427 in firewall/network logs
Network Indicators:
- High volume of SLP protocol packets to UDP port 427
- Malformed SLP packets exceeding normal protocol specifications
SIEM Query:
source="*slpd-lite*" AND ("segmentation fault" OR "buffer overflow" OR "crash") OR dest_port=427 AND protocol=UDP AND packet_size>normal_threshold