CVE-2022-30065
📋 TL;DR
CVE-2022-30065 is a use-after-free vulnerability in BusyBox's awk applet that can be triggered by processing a specially crafted awk pattern. This vulnerability allows attackers to cause denial of service and potentially execute arbitrary code on affected systems. Any device or system running vulnerable versions of BusyBox with awk functionality enabled is affected.
💻 Affected Systems
- BusyBox
📦 What is this software?
Busybox by Busybox
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service causing application crashes or system instability when processing malicious awk patterns.
If Mitigated
Limited impact with proper input validation and sandboxing, potentially only causing awk process crashes.
🎯 Exploit Status
Exploitation requires crafting specific awk patterns to trigger the use-after-free condition. Proof-of-concept code is available in bug reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BusyBox 1.35.1 and later
Vendor Advisory: https://bugs.busybox.net/show_bug.cgi?id=14781
Restart Required: No
Instructions:
1. Update BusyBox to version 1.35.1 or later. 2. Recompile BusyBox if using source distribution. 3. Replace existing BusyBox binary with patched version. 4. No system reboot required, but affected awk processes need restart.
🔧 Temporary Workarounds
Disable awk applet
linuxRemove or disable the awk functionality in BusyBox build configuration
Recompile BusyBox with CONFIG_AWK disabled in .config
Input validation
allImplement strict input validation for awk patterns in applications
🧯 If You Can't Patch
- Restrict access to systems running vulnerable BusyBox versions
- Implement network segmentation to limit potential lateral movement
🔍 How to Verify
Check if Vulnerable:
Check BusyBox version and verify if awk applet is present: busybox | grep -i awk && busybox | head -1Check Version:
busybox | head -1Verify Fix Applied:
Verify BusyBox version is 1.35.1 or later: busybox | head -1📡 Detection & Monitoring
Log Indicators:
- Segmentation faults in awk processes
- Unexpected awk process termination
- High memory usage in awk processes
Network Indicators:
- Unusual network connections from awk processes
- Outbound connections following awk crashes
SIEM Query:
Process:Name='awk' AND EventID=1000 OR EventID=1001 (for Windows) OR kernel:segfault AND process:awk (for Linux)