CVE-2022-29873
📋 TL;DR
This vulnerability in SICAM T devices allows unauthenticated attackers to send specially crafted GET/POST requests that bypass parameter validation. Attackers can cause denial of service or execute arbitrary code by controlling the program counter. All SICAM T devices before version V3.0 are affected.
💻 Affected Systems
- SICAM T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing remote code execution, potentially leading to industrial control system manipulation, data theft, or physical damage.
Likely Case
Denial of service attacks disrupting industrial operations, followed by potential remote code execution if attackers develop reliable exploits.
If Mitigated
Limited impact with proper network segmentation and access controls, though devices remain vulnerable to internal threats.
🎯 Exploit Status
The vulnerability description suggests straightforward exploitation via crafted HTTP requests without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V3.0 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-165073.html
Restart Required: Yes
Instructions:
1. Download SICAM T firmware V3.0 or later from Siemens support portal. 2. Backup device configuration. 3. Apply firmware update following Siemens documentation. 4. Restart device. 5. Verify successful update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SICAM T devices in dedicated network segments with strict firewall rules.
Access Control Lists
allImplement IP-based access restrictions to limit HTTP/HTTPS access to trusted management stations only.
🧯 If You Can't Patch
- Implement strict network segmentation with firewall rules blocking all unnecessary inbound traffic to SICAM T devices.
- Deploy intrusion detection systems monitoring for anomalous HTTP requests to SICAM T web interfaces.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI; if version is below V3.0, device is vulnerable.Check Version:
Check via web interface at /status or using device-specific CLI commands (vendor documentation required).Verify Fix Applied:
Verify firmware version is V3.0 or higher and test that parameter validation rejects malformed GET/POST requests.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to SICAM T web interface
- Multiple failed parameter validation attempts
- Unexpected device restarts
Network Indicators:
- HTTP traffic with malformed parameters to SICAM T ports
- Unusual outbound connections from SICAM T devices
SIEM Query:
source_ip=* AND dest_ip=SICAM_T_IP AND (http_method=GET OR http_method=POST) AND (uri_contains="?" OR content_length>threshold)