CVE-2023-25826
📋 TL;DR
CVE-2023-25826 is an unauthenticated remote command injection vulnerability in OpenTSDB's legacy HTTP query API. Attackers can execute arbitrary operating system commands on the OpenTSDB host system by injecting crafted commands into API parameters. This affects OpenTSDB installations with the legacy HTTP API enabled.
💻 Affected Systems
- OpenTSDB
📦 What is this software?
Opentsdb by Opentsdb
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the OpenTSDB host system leading to data theft, ransomware deployment, lateral movement within the network, and persistent backdoor installation.
Likely Case
Unauthenticated attackers executing arbitrary commands to steal sensitive data, disrupt monitoring services, or use the system as a pivot point for further attacks.
If Mitigated
Limited impact with proper network segmentation, API restrictions, and monitoring in place, potentially only service disruption if commands are blocked.
🎯 Exploit Status
Public exploit code is available, making this easily weaponizable. The vulnerability bypasses regex validation implemented after CVE-2020-35476.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: OpenTSDB 2.4.2
Vendor Advisory: https://github.com/OpenTSDB/opentsdb/pull/2275
Restart Required: Yes
Instructions:
1. Upgrade OpenTSDB to version 2.4.2 or later. 2. Apply the patch from GitHub PR #2275 if upgrading isn't possible. 3. Restart the OpenTSDB service after patching.
🔧 Temporary Workarounds
Disable Legacy HTTP Query API
allDisable the vulnerable legacy HTTP query API endpoint if not required for functionality.
Modify OpenTSDB configuration to set 'tsd.http.query.enable' to false
Network Access Control
linuxRestrict network access to OpenTSDB HTTP API endpoints using firewall rules.
iptables -A INPUT -p tcp --dport 4242 -s trusted_ips -j ACCEPT
iptables -A INPUT -p tcp --dport 4242 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate OpenTSDB from untrusted networks
- Deploy a web application firewall (WAF) with command injection rules in front of OpenTSDB
🔍 How to Verify
Check if Vulnerable:
Check if OpenTSDB version is below 2.4.2 and the legacy HTTP query API is enabled in configuration.Check Version:
curl -s http://opentsdb-host:4242/api/version | grep versionVerify Fix Applied:
Verify OpenTSDB version is 2.4.2 or later and test that command injection attempts are properly blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- HTTP requests with shell metacharacters in query parameters
- Failed authentication attempts followed by API exploitation
Network Indicators:
- HTTP requests containing shell commands or special characters in query parameters
- Unusual outbound connections from OpenTSDB host
SIEM Query:
source="opentsdb.log" AND ("cmd.exe" OR "/bin/sh" OR "bash" OR "|" OR ";" OR "$" OR "`")🔗 References
- http://packetstormsecurity.com/files/174570/OpenTSDB-2.4.1-Unauthenticated-Command-Injection.html
- https://github.com/OpenTSDB/opentsdb/pull/2275
- https://www.synopsys.com/blogs/software-security/opentsdb/
- http://packetstormsecurity.com/files/174570/OpenTSDB-2.4.1-Unauthenticated-Command-Injection.html
- https://github.com/OpenTSDB/opentsdb/pull/2275
- https://www.synopsys.com/blogs/software-security/opentsdb/
