CVE-2022-33915
📋 TL;DR
CVE-2022-33915 is a local privilege escalation vulnerability in Amazon AWS Apache Log4j hotpatch packages. It affects systems using AWS hotpatch versions before 1.3.5 to mitigate Log4Shell (CVE-2021-44228). Attackers can exploit a race condition to execute binaries with elevated privileges.
💻 Affected Systems
- Amazon AWS Apache Log4j hotpatch package
📦 What is this software?
Hotpatch by Amazon
⚠️ Risk & Real-World Impact
Worst Case
Local attacker gains root privileges on affected system, enabling complete system compromise, data theft, and lateral movement.
Likely Case
Local user escalates privileges to execute arbitrary code with higher permissions than intended.
If Mitigated
With proper patching, no privilege escalation is possible through this vector.
🎯 Exploit Status
Exploitation requires local access and timing race condition between process path observation and effective user ID check.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: log4j-cve-2021-44228-hotpatch-1.3.5 or later
Vendor Advisory: https://alas.aws.amazon.com/AL2/ALAS-2022-1806.html
Restart Required: No
Instructions:
1. Update AWS hotpatch package to version 1.3.5 or later. 2. Apply the updated hotpatch to running Java processes. 3. Consider full Log4j update to mitigate underlying CVE-2021-44228.
🔧 Temporary Workarounds
Remove AWS hotpatch
linuxUninstall AWS hotpatch package and apply proper Log4j updates
sudo yum remove log4j-cve-2021-44228-hotpatch
sudo apt-get remove log4j-cve-2021-44228-hotpatch
Restrict local user access
allLimit local user accounts and implement least privilege
🧯 If You Can't Patch
- Remove AWS hotpatch package entirely and rely on proper Log4j version updates
- Implement strict access controls to limit local user privileges and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check installed hotpatch version: rpm -qa | grep log4j-cve-2021-44228-hotpatch or dpkg -l | grep log4j-cve-2021-44228-hotpatchCheck Version:
rpm -q log4j-cve-2021-44228-hotpatch || dpkg -s log4j-cve-2021-44228-hotpatch | grep VersionVerify Fix Applied:
Verify version is 1.3.5 or higher: rpm -q log4j-cve-2021-44228-hotpatch or dpkg -s log4j-cve-2021-44228-hotpatch | grep Version📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- Suspicious Java process execution patterns
- Hotpatch script execution errors
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
Process execution where parent process is hotpatch script and child process has elevated privileges