CVE-2022-20931
📋 TL;DR
This vulnerability allows an unauthenticated attacker on the same network to downgrade Cisco TelePresence CE Software on Cisco Touch 10 devices to an older, potentially vulnerable version. It affects Cisco Touch 10 devices running vulnerable versions of the software, enabling exploitation of known flaws in older releases.
💻 Affected Systems
- Cisco TelePresence CE Software for Cisco Touch 10 Devices
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could install an older version with critical vulnerabilities, leading to full device compromise, data theft, or disruption of telepresence services.
Likely Case
An attacker downgrades the software to exploit known vulnerabilities in older versions, potentially gaining unauthorized access or causing service interruptions.
If Mitigated
With proper network segmentation and updated software, the risk is minimal as attackers cannot access the device or exploit the downgrade.
🎯 Exploit Status
Exploitation requires adjacent network access and involves installing older software versions, but no public proof-of-concept is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Cisco advisory for specific fixed versions.
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-CTT-DAV-HSvEHHEt
Restart Required: Yes
Instructions:
1. Access the Cisco Touch 10 device management interface. 2. Download the updated software version from Cisco's support site. 3. Install the update following Cisco's documentation. 4. Restart the device to apply changes.
🧯 If You Can't Patch
- Segment the network to restrict access to Cisco Touch 10 devices, allowing only trusted devices and users.
- Monitor network traffic for unauthorized software installation attempts and review device logs regularly.
🔍 How to Verify
Check if Vulnerable:
Check the software version on the Cisco Touch 10 device via its management interface and compare with the fixed versions in the Cisco advisory.Check Version:
Use the device's web interface or CLI (if available) to run 'show version' or check system information.Verify Fix Applied:
Confirm the software version matches or exceeds the fixed version listed in the Cisco advisory after patching.📡 Detection & Monitoring
Log Indicators:
- Log entries indicating software downgrade or installation of older versions.
- Unauthorized access attempts to the device management interface.
Network Indicators:
- Unusual network traffic patterns to/from Cisco Touch 10 devices, such as unexpected software update requests.
SIEM Query:
Example: 'source="Cisco_Touch10" AND (event="software_install" OR event="version_change")'