CVE-2024-4282
📋 TL;DR
This vulnerability allows attackers to perform man-in-the-middle attacks against SSH connections to Brocade SANnav OVA appliances by exploiting the use of deprecated SHA1 cryptographic hashing. Organizations using Brocade SANnav OVA versions before 2.3.1b are affected, particularly those with SSH port 22 exposed to untrusted networks.
💻 Affected Systems
- Brocade SANnav OVA
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of SANnav appliance leading to SAN management takeover, potential SAN-wide disruption, and exposure of sensitive storage network configuration data.
Likely Case
SSH session interception allowing credential theft, unauthorized access to SANnav management interface, and potential lateral movement to storage infrastructure.
If Mitigated
Limited impact if SSH access is restricted to trusted networks and proper network segmentation is in place.
🎯 Exploit Status
Exploitation requires man-in-the-middle position against SSH connections. SHA1 collision attacks are well-documented and tools are publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SANnav 2.3.1b
Vendor Advisory: https://support.broadcom.com/external/content/SecurityAdvisories/0/25400
Restart Required: Yes
Instructions:
1. Download SANnav 2.3.1b from Broadcom support portal. 2. Deploy the updated OVA. 3. Migrate configuration from existing deployment. 4. Restart services to apply changes.
🔧 Temporary Workarounds
Disable SSH or restrict access
allBlock SSH port 22 access from untrusted networks using firewall rules
Configure SSH to disable SHA1
linuxModify SSH server configuration to disable SHA1 hash algorithms
Edit /etc/ssh/sshd_config and add: HostKeyAlgorithms -sha1*, PubkeyAcceptedKeyTypes -sha1*
Restart SSH service
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SANnav SSH access to management network only
- Deploy network monitoring for SSH connection anomalies and implement certificate pinning for SSH clients
🔍 How to Verify
Check if Vulnerable:
Check SSH configuration for SHA1 support using: ssh -Q key-sig | grep sha1 or examine /etc/ssh/sshd_config for SHA1 algorithmsCheck Version:
Check SANnav version in web interface or via CLI: show versionVerify Fix Applied:
Verify SANnav version is 2.3.1b or later via management interface and confirm SSH no longer negotiates SHA1 using ssh -vvv📡 Detection & Monitoring
Log Indicators:
- Failed SSH connections with SHA1 algorithm negotiation
- Multiple SSH connection attempts from unusual sources
Network Indicators:
- SSH traffic on port 22 with SHA1 algorithm negotiation in packet captures
- Unusual SSH connection patterns to SANnav appliance
SIEM Query:
source="sshd" AND ("sha1" OR "SHA1") AND dest_port=22