CVE-2023-21948
📋 TL;DR
This vulnerability in Oracle Solaris 10 allows a low-privileged local attacker to gain complete control over the system. It affects users running Oracle Solaris 10 with default configurations. Successful exploitation leads to full system compromise.
💻 Affected Systems
- Oracle Solaris
📦 What is this software?
Solaris by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root privileges, allowing data theft, system destruction, and persistent backdoor installation.
Likely Case
Local privilege escalation from low-privileged user to root, enabling unauthorized access to sensitive data and system resources.
If Mitigated
Limited impact if proper access controls restrict local user accounts and privilege separation is enforced.
🎯 Exploit Status
Described as 'easily exploitable' by Oracle. Requires authenticated local access but low technical complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle CPU April 2023
Vendor Advisory: https://www.oracle.com/security-alerts/cpuapr2023.html
Restart Required: Yes
Instructions:
1. Review Oracle CPU April 2023 advisory. 2. Download appropriate patches for Solaris 10. 3. Apply patches using Solaris patch management tools. 4. Reboot system as required.
🔧 Temporary Workarounds
Restrict Local User Access
allLimit shell access to trusted users only and implement strict privilege separation
# Review /etc/passwd and /etc/shadow for unnecessary accounts
# Implement role-based access control (RBAC) policies
# Use sudo with minimal privileges
🧯 If You Can't Patch
- Implement strict access controls to limit local user accounts
- Monitor for privilege escalation attempts and unusual root activity
🔍 How to Verify
Check if Vulnerable:
Check Solaris version with 'uname -a' and verify if running Solaris 10 without April 2023 patchesCheck Version:
uname -aVerify Fix Applied:
Check patch installation with 'showrev -p' and verify April 2023 CPU patches are applied📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Unusual root activity from non-admin users
- Failed sudo/su attempts followed by successful privilege gain
Network Indicators:
- N/A (local exploit only)
SIEM Query:
source="solaris" AND (event_type="privilege_escalation" OR user="root" AND process!="authorized_process")