CVE-2022-22374
📋 TL;DR
This vulnerability allows attackers to perform a firmware downgrade attack on IBM Power 9 AC922 servers with specific BMC firmware versions. This could enable attackers to install older, vulnerable firmware versions with known security flaws. Affected systems include IBM Power 9 AC922 servers with OP910, OP920, OP930, and OP940 BMC firmware.
💻 Affected Systems
- IBM Power 9 AC922 servers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could downgrade to firmware with critical vulnerabilities, potentially gaining full control of the BMC and subsequently the host server, leading to complete system compromise, data theft, or service disruption.
Likely Case
Attackers with network access to BMC interfaces could downgrade firmware to versions with known exploits, enabling privilege escalation, persistence, or denial of service attacks.
If Mitigated
With proper network segmentation and access controls, the attack surface is limited to authorized administrators, reducing risk to accidental or insider threats only.
🎯 Exploit Status
Exploitation requires access to BMC management interface and knowledge of firmware downgrade procedures. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply firmware updates as specified in IBM advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/6565075
Restart Required: Yes
Instructions:
1. Download latest BMC firmware from IBM Fix Central. 2. Follow IBM's firmware update procedures for Power 9 AC922 servers. 3. Verify firmware version after update. 4. Restart BMC services as required.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to BMC management interfaces to authorized administration networks only
Access Control
allImplement strong authentication and authorization controls for BMC access
🧯 If You Can't Patch
- Isolate BMC management interfaces on dedicated, restricted VLANs
- Implement strict firewall rules to allow BMC access only from authorized IP addresses
🔍 How to Verify
Check if Vulnerable:
Check BMC firmware version via BMC web interface or IPMI commands. If version is OP910, OP920, OP930, or OP940, system is vulnerable.Check Version:
ipmitool mc info (requires IPMI access) or check BMC web interface firmware versionVerify Fix Applied:
Verify BMC firmware has been updated to a version later than OP940. Check release notes for specific fixed versions.📡 Detection & Monitoring
Log Indicators:
- BMC firmware downgrade attempts
- Unauthorized firmware update events
- Multiple failed authentication attempts to BMC
Network Indicators:
- Unexpected traffic to BMC management ports (default 443/HTTPS, 623/IPMI)
- Firmware transfer traffic to BMC interfaces
SIEM Query:
source="BMC" AND (event_type="firmware_update" OR event_type="authentication_failure")