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## https://sploitus.com/exploit?id=DBA73D9F-69AE-5A75-AD4B-8890293E4D2C
# CVE-2025-20393 Scanner
**Cisco Secure Email Gateway & Email and Web Manager - Unauthenticated Remote Code Execution Vulnerability Scanner**
## ๐จ Executive Summary
CVE-2025-20393 is a **critical unauthenticated remote code execution vulnerability** affecting Cisco Secure Email Gateway (SEG) and Cisco Secure Email and Web Manager (SEWM) appliances. This zero-day vulnerability has been **actively exploited in the wild** since at least late November 2025 by the Chinese APT group UAT-9686.
### Key Facts
- **CVSS Score:** 10.0 (Critical)
- **CWE:** CWE-20 (Improper Input Validation)
- **Attack Vector:** Network (AV:N)
- **Attack Complexity:** Low (AC:L)
- **Privileges Required:** None (PR:N)
- **User Interaction:** None (UI:N)
- **Scope:** Changed (S:C)
- **Impact:** High (CIA:HHH)
- **Exploitation Status:** Active in the wild
- **Patch Status:** No patch available (as of December 17, 2025)
## ๐ Table of Contents
- [Vulnerability Details](#-vulnerability-details)
- [Affected Products](#-affected-products)
- [Attack Campaign](#-attack-campaign)
- [Installation](#-installation)
- [Usage](#-usage)
- [Features](#-features)
- [Detection Methods](#-detection-methods)
- [Indicators of Compromise](#-indicators-of-compromise)
- [Mitigation](#-mitigation)
- [References](#-references)
- [Disclaimer](#-disclaimer)
## ๐ Vulnerability Details
### Description
CVE-2025-20393 is an **improper input validation vulnerability** in Cisco AsyncOS Software that allows unauthenticated remote attackers to execute arbitrary commands with **root privileges** on the underlying operating system of affected appliances.
The vulnerability specifically affects appliances where:
1. The **Spam Quarantine** feature is enabled
2. The Spam Quarantine port is **exposed to and reachable from the internet**
### Technical Analysis
- **Root Cause:** Improper input validation in the Spam Quarantine feature
- **Exploitation:** Unauthenticated attackers can send specially crafted requests
- **Result:** Arbitrary command execution as root
- **Persistence:** Attackers deploy persistent backdoors and tunneling tools
## ๐ฏ Affected Products
All versions of the following products are vulnerable when Spam Quarantine is exposed:
### Cisco Secure Email Gateway (SEG)
- Physical appliances
- Virtual appliances
- All releases of Cisco AsyncOS Software
### Cisco Secure Email and Web Manager (SEWM)
- Physical appliances
- Virtual appliances
- All releases of Cisco AsyncOS Software
**Note:** Cisco Secure Email Cloud is **NOT** affected.
## ๐ต๏ธ Attack Campaign
### Threat Actor: UAT-9686
Cisco Talos attributes this campaign with **moderate confidence** to a **Chinese-nexus Advanced Persistent Threat (APT)** actor designated as UAT-9686.
### Attack Timeline
- **Late November 2025:** Campaign begins
- **December 10, 2025:** Cisco becomes aware during TAC case
- **December 17, 2025:** Public disclosure and advisory release
### Attack Chain
1. **Initial Access:** Exploit CVE-2025-20393 via exposed Spam Quarantine
2. **Execution:** Execute arbitrary commands as root
3. **Persistence:** Deploy multiple backdoors and tools
4. **Command & Control:** Establish covert channels
5. **Defense Evasion:** Clear logs and disable monitoring
## ๐ Installation
### Prerequisites
- Python 3.6 or higher
- pip package manager
- Network access to target systems
### Setup
```bash
# Clone the repository
git clone https://github.com/yourusername/cve-2025-20393-scanner.git
cd cve-2025-20393-scanner
# Install dependencies
pip install -r requirements.txt
# Make the script executable
chmod +x cve-2025-20393-scanner.py
```
## ๐ป Usage
### Basic Usage
```bash
# Scan a single target
python cve-2025-20393-scanner.py -t 192.168.1.100
# Scan with output report
python cve-2025-20393-scanner.py -t mail.company.com -o report.json
```
### Advanced Usage
```bash
# Scan multiple targets from a file
python cve-2025-20393-scanner.py -t targets.txt -o results.json
# Scan a CIDR range
python cve-2025-20393-scanner.py -t 10.0.0.0/24 --threads 20
# Custom timeout and user agent
python cve-2025-20393-scanner.py -t target.com --timeout 15 --user-agent "Custom Scanner"
```
### Command-Line Options
```
Options:
-h, --help Show help message and exit
-t, --target TARGET Target IP, hostname, file, or CIDR range
-o, --output OUTPUT Output JSON report file
--timeout TIMEOUT Connection timeout in seconds (default: 10)
--threads THREADS Number of concurrent threads (default: 10)
--user-agent UA Custom User-Agent string
```
### Target Input Formats
- **Single IP:** `192.168.1.100`
- **Hostname:** `mail.company.com`
- **CIDR Range:** `10.0.0.0/24`
- **File:** `targets.txt` (one target per line)
- **URL:** `https://mail.company.com:443`
## โจ Features
### Detection Capabilities
- โ
**Banner Grabbing:** Identifies Cisco AsyncOS products
- โ
**Product Identification:** Detects SEG/SEWM appliances
- โ
**Spam Quarantine Detection:** Checks if feature is exposed
- โ
**Version Disclosure:** Attempts to identify AsyncOS version
- โ
**Multi-Port Scanning:** Tests common Spam Quarantine ports (6025, 82, 443, 8443)
- โ
**Concurrent Scanning:** Multi-threaded for fast results
- โ
**CIDR Range Support:** Scan entire network ranges
- โ
**JSON Reporting:** Structured output for integration
### Scanner Output
The scanner provides:
- Color-coded terminal output
- Real-time scanning status
- Vulnerability assessment
- Risk level classification
- Detailed findings report
- JSON export for automation
## ๐ Detection Methods
### 1. Banner Analysis
```
Server: Cisco IronPort AsyncOS
```
### 2. HTTP Response Indicators
- Content contains: "Cisco", "IronPort", "AsyncOS", "Spam Quarantine"
- Login pages with Cisco branding
- Spam Quarantine interface elements
### 3. Port Detection
- **Port 6025:** Default Spam Quarantine port
- **Port 82:** Alternative HTTP port
- **Port 443/8443:** HTTPS management interfaces
### 4. Path Enumeration
- `/quarantine`
- `/spamquarantine`
- `/spam`
- `/sma-login`
- `/login`
## ๐ด Indicators of Compromise (IOCs)
### Malware Families
#### 1. AquaShell
- **Type:** Python-based persistent backdoor
- **Function:** Remote access and command execution
- **Detection:** Python processes with suspicious network activity
#### 2. AquaTunnel
- **Type:** Reverse SSH tunnel
- **Function:** Establishes covert communication channel
- **Detection:** Unusual SSH connections to external IPs
#### 3. Chisel
- **Type:** Fast TCP/UDP tunnel over HTTP
- **Function:** Network tunneling and port forwarding
- **Detection:** Chisel binary or process execution
#### 4. AquaPurge
- **Type:** Log-clearing utility
- **Function:** Removes evidence of compromise
- **Detection:** Missing or truncated log files
### Network IOCs
Check Cisco's official advisory for the latest IP addresses and domains associated with UAT-9686.
### File System IOCs
- Unexpected Python scripts in `/opt/` or `/tmp/`
- Modified system binaries or libraries
- Suspicious cron jobs or startup scripts
- Unauthorized SSH keys in authorized_keys files
### Behavioral IOCs
- Unusual outbound connections from appliances
- Gaps in system logs
- Unexpected process executions
- Modified configuration files
- Unauthorized administrative access
## ๐ก๏ธ Mitigation
### Immediate Actions
1. **Identify Exposure**
```bash
# Check if Spam Quarantine is enabled
# Login to web interface โ Network โ IP Interfaces
# Verify if "Spam Quarantine" checkbox is enabled
```
2. **Restrict Access**
- Remove internet exposure to Spam Quarantine ports
- Implement strict firewall rules
- Use VPN for administrative access
3. **Check for Compromise**
- Open Cisco TAC case for investigation
- Enable remote access for Cisco analysis
- Review system logs for IOCs
- Check for unauthorized processes
4. **Incident Response**
- If compromised: **Rebuild appliance from scratch**
- Persistence mechanisms cannot be reliably removed
- Restore from known-good configuration backups
### Hardening Recommendations
#### Network Security
- Prevent direct internet access to appliances
- Restrict access to known, trusted hosts only
- Deploy behind filtering devices (firewalls)
- Implement two-layer firewall architecture
- Separate mail and management networks
#### Access Controls
- Disable HTTP for admin portal (use HTTPS only)
- Disable unnecessary services (HTTP, FTP)
- Implement strong authentication (SAML, LDAP)
- Change default administrator passwords
- Create operator accounts with minimal privileges
- Use SSL/TLS certificates for all interfaces
#### Monitoring
- Send logs to external server
- Retain logs for forensic analysis
- Monitor for unexpected traffic patterns
- Set up alerts for suspicious activities
- Regular security audits
#### System Hardening
- Upgrade to latest AsyncOS version
- Apply all security patches when available
- Regular configuration reviews
- Implement least privilege principle
- Document all changes
## ๐ References
### Official Advisories
- [Cisco Security Advisory (cisco-sa-sma-attack-N9bf4)](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4)
- [CISA KEV Catalog Entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog)
- [NVD CVE-2025-20393](https://nvd.nist.gov/vuln/detail/CVE-2025-20393)
### Threat Intelligence
- [Cisco Talos UAT-9686 Analysis](https://blog.talosintelligence.com/uat-9686/)
- [BleepingComputer Coverage](https://www.bleepingcomputer.com/news/security/cisco-warns-of-unpatched-asyncos-zero-day-exploited-in-attacks/)
### Technical Resources
- [Cisco SEG Deployment Guide](https://www.cisco.com/c/en/us/td/docs/security/esa/esa16-0-3/user_guide/b_ESA_Admin_Guide_16-0-3.html)
- [Cisco SEWM Deployment Guide](https://www.cisco.com/c/en/us/td/docs/security/security_management/sma/sma16-0-2/user_guide/b_sma_admin_guide_16_0_2.html)
### CVSS Calculator
- [CVSS 3.1 Vector](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
## โ๏ธ Disclaimer
**IMPORTANT LEGAL NOTICE**
This tool is provided for **authorized security testing and research purposes only**. Users must ensure they have proper authorization before scanning any systems.
### Legal Requirements
- โ
Obtain written authorization before scanning
- โ
Only scan systems you own or have explicit permission to test
- โ
Comply with all applicable laws and regulations
- โ
Report findings responsibly
- โ Do not use for unauthorized access
- โ Do not use for malicious purposes
- โ Do not scan systems without permission
### Liability
The authors and contributors of this tool:
- Provide this software "as is" without warranty
- Are not responsible for any misuse or damage
- Assume no liability for unauthorized usage
- Encourage responsible security research
### Ethical Use
This tool should be used to:
- Assess your own security posture
- Conduct authorized penetration tests
- Assist in incident response
- Support security research
- Improve overall cybersecurity
**Unauthorized access to computer systems is illegal and punishable by law.**
## ๐ค Contributing
Contributions are welcome! Please:
1. Fork the repository
2. Create a feature branch
3. Commit your changes
4. Push to the branch
5. Create a Pull Request
## ๐ License
This project is licensed under the MIT License - see the LICENSE file for details.
## ๐ค Author
**thesystemowner**
- Cybersecurity Engineer
- Red Team Specialist
- Malware Analyst
## ๐ Updates
Stay informed about CVE-2025-20393:
- Monitor Cisco Security Advisories
- Follow [@CiscoSecurity](https://twitter.com/CiscoSecurity) on Twitter
- Subscribe to [Cisco Security Notifications](https://www.cisco.com/c/en/us/support/web/tools/cns/notifications.html)
- Check CISA KEV Catalog regularly
---
**Last Updated:** December 18, 2025
**Scanner Version:** 1.0
**CVE Status:** Active Exploitation - No Patch Available
๐ด **CRITICAL:** This is an actively exploited zero-day vulnerability. Immediate action required for all Cisco SEG/SEWM deployments with exposed Spam Quarantine features.