CVE-2021-21433
📋 TL;DR
CVE-2021-21433 is a critical remote code execution vulnerability in Discord Recon Server version 0.0.1, allowing attackers to execute arbitrary commands on the server hosting the bot. This affects anyone running the vulnerable version of this Discord reconnaissance bot. The vulnerability is patched in version 0.0.2.
💻 Affected Systems
- Discord Recon Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the server hosting the Discord Recon bot, allowing attackers to execute arbitrary commands, steal data, install malware, or pivot to other systems.
Likely Case
Attackers gain remote shell access to the bot server, enabling reconnaissance, data exfiltration, and potential lateral movement within the network.
If Mitigated
Limited impact with proper network segmentation and least privilege access controls, potentially containing the breach to the isolated bot server.
🎯 Exploit Status
The vulnerability is in the code injection mechanism, making exploitation straightforward. Public GitHub issues and commits demonstrate the exploit path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.0.2
Vendor Advisory: https://github.com/DEMON1A/Discord-Recon/security/advisories/GHSA-65fm-5x64-gv9x
Restart Required: Yes
Instructions:
1. Stop the Discord Recon Server bot. 2. Update to version 0.0.2 using 'npm update discord-recon-server' or by pulling the latest code from GitHub. 3. Restart the bot service.
🔧 Temporary Workarounds
Disable vulnerable bot
linuxImmediately stop and disable the Discord Recon Server bot until patched.
sudo systemctl stop discord-recon
sudo systemctl disable discord-recon
Network isolation
linuxIsolate the bot server from critical systems using firewall rules.
iptables -A OUTPUT -d [CRITICAL_IP_RANGE] -j DROP
🧯 If You Can't Patch
- Immediately disable and remove the Discord Recon Server bot from all systems.
- Implement strict network segmentation to isolate any systems that cannot be immediately patched.
🔍 How to Verify
Check if Vulnerable:
Check package.json or version file for '0.0.1' version string. Run: grep -r "0.0.1" /path/to/discord-recon/Check Version:
grep '"version"' package.json | cut -d'"' -f4Verify Fix Applied:
Verify version is 0.0.2 or higher. Check package.json or run: node -e "console.log(require('./package.json').version)"📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Suspicious process creation from the Discord Recon bot user
- Error logs showing code injection attempts
Network Indicators:
- Unexpected outbound connections from the bot server
- Command and control traffic patterns
SIEM Query:
process_name="node" AND parent_process="discord-recon" AND command_line CONTAINS "sh" OR command_line CONTAINS "bash"🔗 References
- https://github.com/DEMON1A/Discord-Recon/commit/26e2a084679679cccdeeabbb6889ce120eff7e50
- https://github.com/DEMON1A/Discord-Recon/issues/6
- https://github.com/DEMON1A/Discord-Recon/security/advisories/GHSA-65fm-5x64-gv9x
- https://github.com/DEMON1A/Discord-Recon/commit/26e2a084679679cccdeeabbb6889ce120eff7e50
- https://github.com/DEMON1A/Discord-Recon/issues/6
- https://github.com/DEMON1A/Discord-Recon/security/advisories/GHSA-65fm-5x64-gv9x
