CVE-2019-1010200
📋 TL;DR
This CVE describes a critical OS command injection vulnerability in Google Voice Builder that allows remote attackers to execute arbitrary commands on affected servers. The vulnerability exists in three endpoints across two web servers and can be exploited via specially crafted GET requests. Any organization running vulnerable versions of Voice Builder is affected.
💻 Affected Systems
- Google Voice Builder
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise leading to data exfiltration, lateral movement within the network, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to steal sensitive data, disrupt services, or use the server for further attacks.
If Mitigated
Attack blocked at network perimeter or detected before successful exploitation.
🎯 Exploit Status
The vulnerability is straightforward to exploit via HTTP GET requests with malicious query parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: After commit f6660e6d8f0d1d931359d591dbdec580fef36d36
Vendor Advisory: https://github.com/google/voice-builder/commit/f6660e6d8f0d1d931359d591dbdec580fef36d36
Restart Required: Yes
Instructions:
1. Update to the latest Voice Builder version after commit f6660e6d8f0d1d931359d591dbdec580fef36d36. 2. Restart all Voice Builder services. 3. Verify the fix by checking that the vulnerable endpoints no longer accept malicious input.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to the vulnerable endpoints using firewall rules or network segmentation.
iptables -A INPUT -p tcp --dport [VOICE_BUILDER_PORT] -s [TRUSTED_IPS] -j ACCEPT
iptables -A INPUT -p tcp --dport [VOICE_BUILDER_PORT] -j DROP
Web Application Firewall
allDeploy a WAF with command injection detection rules to block exploitation attempts.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs in the affected endpoints.
- Run Voice Builder services with minimal privileges and in isolated containers or virtual machines.
🔍 How to Verify
Check if Vulnerable:
Check if your Voice Builder version is prior to commit f6660e6d8f0d1d931359d591dbdec580fef36d36 by examining the git commit history or version metadata.Check Version:
git log --oneline -1Verify Fix Applied:
Test the /tts and /alignment endpoints with command injection payloads (e.g., '; ls' or '| cat /etc/passwd') to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- HTTP requests to /tts or /alignment endpoints with suspicious query parameters containing shell metacharacters
Network Indicators:
- HTTP GET requests to vulnerable endpoints with command injection payloads in query strings
SIEM Query:
source="web_server_logs" AND (uri_path="/tts" OR uri_path="/alignment") AND query_string MATCHES "[;|&`$()]"🔗 References
- https://github.com/google/voice-builder/commit/c145d4604df67e6fc625992412eef0bf9a85e26b
- https://github.com/google/voice-builder/commit/f6660e6d8f0d1d931359d591dbdec580fef36d36
- https://github.com/google/voice-builder/commit/c145d4604df67e6fc625992412eef0bf9a85e26b
- https://github.com/google/voice-builder/commit/f6660e6d8f0d1d931359d591dbdec580fef36d36
