CVE-2022-28657
📋 TL;DR
This vulnerability in Apport's crash reporting tool allows local attackers to escape chroot restrictions by exploiting the Python crash handler. It affects Ubuntu systems where Apport is enabled, potentially allowing privilege escalation or unauthorized file access.
💻 Affected Systems
- Apport
📦 What is this software?
Apport by Apport Project
Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
Ubuntu Linux by Canonical
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to root, allowing complete system compromise and data exfiltration.
Likely Case
Local user gains unauthorized access to files outside chroot jail, potentially reading sensitive system files.
If Mitigated
No impact if Apport is disabled or system is patched; chroot isolation remains effective.
🎯 Exploit Status
Requires local access and ability to trigger a Python crash within Apport's chroot environment
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apport 2.20.11-0ubuntu82.1
Vendor Advisory: https://ubuntu.com/security/notices/USN-5427-1
Restart Required: No
Instructions:
1. Update package list: sudo apt update
2. Upgrade Apport: sudo apt install --only-upgrade apport
3. Verify installation: apt-cache policy apport
🔧 Temporary Workarounds
Disable Apport
linuxCompletely disable Apport crash reporting to eliminate the vulnerability
sudo systemctl stop apport
sudo systemctl disable apport
🧯 If You Can't Patch
- Disable Apport service completely
- Restrict local user access to systems with Apport enabled
🔍 How to Verify
Check if Vulnerable:
Check Apport version: dpkg -l | grep apportCheck Version:
dpkg -l apport | grep ^iiVerify Fix Applied:
Verify version is 2.20.11-0ubuntu82.1 or later: dpkg -l apport📡 Detection & Monitoring
Log Indicators:
- Unusual Apport crash reports
- Python crash handler errors in system logs
Network Indicators:
- None (local exploit only)
SIEM Query:
process:apport AND (event:crash OR event:chroot)