CVE-2025-5277
📋 TL;DR
CVE-2025-5277 is a command injection vulnerability in aws-mcp-server that allows attackers to execute arbitrary commands on the host system by crafting malicious prompts. This affects any system running the vulnerable aws-mcp-server software, particularly those exposed to untrusted users or inputs. The vulnerability stems from improper neutralization of special elements used in OS commands.
💻 Affected Systems
- aws-mcp-server
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining root/administrator privileges, data exfiltration, ransomware deployment, or complete system destruction.
Likely Case
Unauthorized command execution leading to data theft, lateral movement within the network, or deployment of malware/backdoors.
If Mitigated
Limited impact with only non-privileged command execution if proper sandboxing and least privilege are enforced.
🎯 Exploit Status
The vulnerability is straightforward to exploit as it involves simple command injection via crafted prompts. No authentication is required if the server is accessible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit 94d20ae1798a43ac7e3a28e71900d774e5159c8a or later
Vendor Advisory: https://github.com/alexei-led/aws-mcp-server/commit/94d20ae1798a43ac7e3a28e71900d774e5159c8a
Restart Required: Yes
Instructions:
1. Pull the latest code from the GitHub repository. 2. Update to commit 94d20ae1798a43ac7e3a28e71900d774e5159c8a or later. 3. Restart the aws-mcp-server service. 4. Verify the fix by checking the updated cli_executor.py file.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation to reject any prompts containing shell metacharacters or suspicious patterns.
# Add input validation in your application code to filter: ; & | $ ` \n ( ) < >
Network Access Control
linuxRestrict network access to aws-mcp-server to only trusted IP addresses or internal networks.
# Example iptables rule: iptables -A INPUT -p tcp --dport [aws-mcp-port] -s [trusted-ip] -j ACCEPT
# Then: iptables -A INPUT -p tcp --dport [aws-mcp-port] -j DROP
🧯 If You Can't Patch
- Immediately isolate the vulnerable system from internet access and restrict internal network access.
- Run aws-mcp-server with minimal privileges using a dedicated non-root user account and containerization/sandboxing.
🔍 How to Verify
Check if Vulnerable:
Check if your aws-mcp-server version is before commit 94d20ae1798a43ac7e3a28e71900d774e5159c8a by examining the cli_executor.py file at line 92 for unsafe command execution patterns.Check Version:
git log --oneline -1 # Check the latest commit hash in your aws-mcp-server directoryVerify Fix Applied:
Verify that the cli_executor.py file has been updated to include proper input sanitization and safe command execution methods (e.g., using subprocess with shell=False).📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Unexpected processes spawned by aws-mcp-server
- Failed login attempts or unauthorized access to the server
Network Indicators:
- Unusual outbound connections from the aws-mcp-server host
- Traffic to known malicious IPs or domains
SIEM Query:
source="aws-mcp-server" AND (event="command_execution" OR event="process_spawn") | where command contains [; & | ` $]