CVE-2009-5042
📋 TL;DR
CVE-2009-5042 is a vulnerability in python-docutils where insecure temporary file handling allows local attackers to create or overwrite arbitrary files. This affects systems running vulnerable versions of python-docutils, particularly those where untrusted users can execute docutils commands or scripts that use docutils functionality.
💻 Affected Systems
- python-docutils
📦 What is this software?
Python Docutils by Python Docutils Project
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to root/system user, arbitrary file creation/modification leading to complete system compromise.
Likely Case
Local user gains unauthorized file access or modifies configuration files to elevate privileges.
If Mitigated
Limited impact with proper file permissions and user isolation in place.
🎯 Exploit Status
Exploitation requires local access and ability to execute docutils commands. Race condition in temporary file handling can be exploited.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: python-docutils 0.6 and later
Vendor Advisory: https://security-tracker.debian.org/tracker/CVE-2009-5042
Restart Required: No
Instructions:
1. Update python-docutils to version 0.6 or later using your package manager. 2. For Debian/Ubuntu: sudo apt-get update && sudo apt-get install python-docutils. 3. For pip: pip install --upgrade docutils.
🔧 Temporary Workarounds
Restrict docutils execution
linuxLimit execution of docutils tools to trusted users only
chmod 750 /usr/bin/rst2*.py
chown root:trustedgroup /usr/bin/rst2*.py
Use secure temporary directory
linuxSet TMPDIR environment variable to a secure, user-isolated directory
export TMPDIR=/tmp/$USER
mkdir -p /tmp/$USER && chmod 700 /tmp/$USER
🧯 If You Can't Patch
- Remove execute permissions from docutils scripts for untrusted users
- Monitor for suspicious file operations in /tmp directories
🔍 How to Verify
Check if Vulnerable:
Check python-docutils version: python -c "import docutils; print(docutils.__version__)"Check Version:
python -c "import docutils; print(docutils.__version__)" or dpkg -l python-docutils | grep ^iiVerify Fix Applied:
Verify version is 0.6 or higher: python -c "import docutils; print('Vulnerable' if docutils.__version__ < '0.6' else 'Patched')"📡 Detection & Monitoring
Log Indicators:
- Failed file operations in /tmp
- Unexpected docutils process execution by non-privileged users
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
process.name:rst2* AND user.name:!root