How the CVE Works:
The vulnerability in Pleezer arises due to improper handling of hook scripts triggered by track changes and playback events. When these scripts execute, the parent process fails to clean up child processes properly, leading to zombie process accumulation. Zombie processes remain in the system’s process table, consuming resources. Over time, rapid event triggers (e.g., frequent track skips) exacerbate the issue, causing process table exhaustion and system instability. Attackers could manipulate Deezer Connect protocol traffic to accelerate resource depletion.
DailyCVE Form:
Platform: Pleezer
Version: <0.16.0
Vulnerability: Zombie process leak
Severity: Medium
Date: 2023-XX-XX
What Undercode Say:
Exploitation:
- Trigger Hook Scripts: Flood Pleezer with track/playback events via Deezer Connect protocol.
- Monitor Process Table: Use `ps aux | grep defunct` to confirm zombie accumulation.
- Resource Exhaustion: Sustain attacks until system denies new processes.
Protection:
- Upgrade: Install Pleezer v0.16.0+ for async process cleanup.
- Disable Hooks: Remove `–hook` flag if upgrade is delayed.
- Manual Cleanup: Restart Pleezer periodically via
killall pleezer && pleezer.
Detection Commands:
Check zombie processes: ps -elf | grep 'Z' Count Pleezer child processes: pgrep -P $(pgrep pleezer) | wc -l
Hook Script Fix (Temporary Workaround):
!/bin/sh Ensure child processes exit cleanly trap 'kill $(jobs -p)' EXIT your_script_command &
Log Monitoring:
Track hook executions: journalctl -u pleezer --grep="hook triggered"
Mitigation Script (Cron Job):
!/bin/sh Auto-restart if zombie count exceeds threshold ZOMBIES=$(ps -elf | grep -c 'Z') [ "$ZOMBIES" -gt 50 ] && systemctl restart pleezer
Network Hardening:
Restrict Deezer Connect traffic (iptables): iptables -A INPUT -p tcp --dport [bash] -m connlimit --connlimit-above 10 -j DROP
Debugging:
Trace process forks: strace -f -e trace=process pleezer --hook /path/to/script
References:
- Patch: [Pleezer v0.16.0 Changelog]
- CWE-401: Improper Resource Shutdown/Release
References:
Reported By: https://github.com/advisories/GHSA-472w-7w45-g3w5
Extra Source Hub:
Undercode
