CVE-2022-21524
📋 TL;DR
This vulnerability in Oracle Solaris 11's filesystem component allows authenticated attackers with network access via SMB to cause denial of service (system hangs/crashes) and perform unauthorized data manipulation. It affects Oracle Solaris 11 systems with SMB access enabled, requiring only low privilege credentials for exploitation.
💻 Affected Systems
- Oracle Solaris
📦 What is this software?
Solaris by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Complete system denial of service (hang or crash) combined with unauthorized data modification and information disclosure, potentially leading to extended downtime and data integrity issues.
Likely Case
System instability or crashes affecting availability, with potential for limited data manipulation by authenticated attackers.
If Mitigated
Minimal impact if SMB access is restricted, proper network segmentation is implemented, and only trusted users have access.
🎯 Exploit Status
Exploitation requires low privilege credentials and network access via SMB. The vulnerability is described as 'easily exploitable' by Oracle.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Oracle's July 2022 Critical Patch Update for specific patch details
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2022.html
Restart Required: Yes
Instructions:
1. Review Oracle's July 2022 Critical Patch Update advisory. 2. Download and apply the appropriate patches for Oracle Solaris 11. 3. Restart affected systems as required by the patch.
🔧 Temporary Workarounds
Disable SMB access
solarisDisable SMB file sharing if not required for business operations
svcadm disable smb/server
svcadm disable smb/client
Restrict SMB network access
solarisUse firewall rules to restrict SMB access to trusted networks only
ipf - add rule to block SMB ports (445, 139) from untrusted networks
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Solaris systems with SMB enabled
- Apply principle of least privilege to user accounts with SMB access and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check if running Oracle Solaris 11 and SMB service is enabled: 'svcs -a | grep smb'Check Version:
uname -a ; pkg list entireVerify Fix Applied:
Verify patch installation via 'pkg list' and check SMB service status📡 Detection & Monitoring
Log Indicators:
- Unusual SMB connection attempts
- System crash/hang events in system logs
- Failed authentication attempts followed by SMB activity
Network Indicators:
- SMB traffic to Solaris systems from unexpected sources
- Multiple SMB sessions from single source
SIEM Query:
source="solaris_logs" AND ("SMB" OR "smb") AND ("crash" OR "hang" OR "denial")