CVE-2022-48078
📋 TL;DR
CVE-2022-48078 is a critical stack overflow vulnerability in pycdc, a Python decompiler tool. Attackers can exploit this vulnerability by providing malicious Python bytecode files, potentially leading to arbitrary code execution. Anyone using pycdc to decompile untrusted Python bytecode files is affected.
💻 Affected Systems
- pycdc (Python decompiler)
📦 What is this software?
Pycdc by Pycdc Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the pycdc process, potentially leading to full system compromise if pycdc runs with elevated privileges.
Likely Case
Application crash (denial of service) when processing malicious bytecode files, with potential for code execution in specific configurations.
If Mitigated
Limited impact if pycdc runs in sandboxed environments with minimal privileges and only processes trusted bytecode files.
🎯 Exploit Status
The GitHub issue contains technical details and proof-of-concept. Exploitation requires providing malicious Python bytecode files to pycdc.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit 44a730f3a889503014fec94ae6e62d8401cb75e5
Vendor Advisory: https://github.com/zrax/pycdc/issues/295
Restart Required: No
Instructions:
1. Update pycdc to the latest version from the official GitHub repository. 2. Rebuild from source if using compiled binaries. 3. Replace any existing pycdc binaries with the updated version.
🔧 Temporary Workarounds
Restrict pycdc usage
allLimit pycdc to only process trusted Python bytecode files from verified sources.
Run with reduced privileges
linuxExecute pycdc with minimal user privileges to limit potential damage from exploitation.
sudo -u lowprivilegeuser pycdc [options]
🧯 If You Can't Patch
- Discontinue use of pycdc for decompiling untrusted bytecode files
- Implement strict input validation and sandboxing for any pycdc execution
🔍 How to Verify
Check if Vulnerable:
Check pycdc version or commit hash. If using commit 44a730f3a889503014fec94ae6e62d8401cb75e5 or earlier, you are vulnerable.Check Version:
pycdc --version (if available) or check git commit hash in source directoryVerify Fix Applied:
Verify you have a version after commit 44a730f3a889503014fec94ae6e62d8401cb75e5 by checking git log or version information.📡 Detection & Monitoring
Log Indicators:
- Segmentation faults or abnormal termination of pycdc processes
- Large stack usage warnings in system logs
Network Indicators:
- Unusual network connections originating from pycdc processes if RCE is achieved
SIEM Query:
Process:name='pycdc' AND (EventID=1000 OR EventID=1001) OR Process:name='pycdc' AND Network:outbound=true