CVE-2022-4934
📋 TL;DR
This CVE describes a post-authentication command injection vulnerability in Sophos Web Appliance's exception wizard. It allows authenticated administrators to execute arbitrary code on the system. Only administrators with valid credentials can exploit this vulnerability.
💻 Affected Systems
- Sophos Web Appliance
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with administrator credentials could gain full control of the appliance, potentially pivoting to internal networks, stealing sensitive data, or deploying persistent backdoors.
Likely Case
Malicious insider or compromised administrator account could execute arbitrary commands to disrupt services, exfiltrate data, or maintain persistence on the appliance.
If Mitigated
With proper access controls and monitoring, exploitation would be limited to authorized administrators and would be detectable through security monitoring.
🎯 Exploit Status
Exploitation requires valid administrator credentials. The vulnerability is in a post-authentication component, making it accessible only to authorized users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3.10.4
Vendor Advisory: https://www.sophos.com/en-us/security-advisories/sophos-sa-20230404-swa-rce
Restart Required: Yes
Instructions:
1. Log into Sophos Web Appliance admin interface. 2. Navigate to System > Updates. 3. Check for and apply update to version 4.3.10.4 or later. 4. Restart the appliance as prompted.
🔧 Temporary Workarounds
Restrict Administrator Access
allLimit administrator account access to only trusted personnel and implement multi-factor authentication if available.
Network Segmentation
allRestrict network access to the admin interface using firewall rules to only allow connections from trusted management networks.
🧯 If You Can't Patch
- Implement strict access controls and monitoring for administrator accounts
- Consider temporarily disabling the exception wizard feature if not required
🔍 How to Verify
Check if Vulnerable:
Check the appliance version in the admin interface under System > About. If version is older than 4.3.10.4, the system is vulnerable.Check Version:
ssh admin@appliance-ip 'cat /etc/version' or check via web interface at System > AboutVerify Fix Applied:
After updating, verify the version shows 4.3.10.4 or later in System > About.📡 Detection & Monitoring
Log Indicators:
- Unusual administrator login patterns
- Commands executed via exception wizard with suspicious parameters
- Multiple failed login attempts followed by successful login
Network Indicators:
- Unusual outbound connections from the appliance
- Traffic to unexpected destinations from appliance management interface
SIEM Query:
source="sophos-web-appliance" AND (event_type="admin_login" OR event_type="exception_wizard_exec") | stats count by user, src_ip