CVE-2021-2461
📋 TL;DR
This vulnerability in Oracle Communications Interactive Session Recorder allows unauthenticated attackers to remotely manipulate data, read sensitive information, and cause partial service disruption via HTTP requests. It affects version 6.4 of the product and can impact other connected systems due to its network-accessible nature.
💻 Affected Systems
- Oracle Communications Interactive Session Recorder
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of session recording data integrity, unauthorized access to sensitive communications recordings, and denial of service affecting critical communications infrastructure.
Likely Case
Unauthorized modification or deletion of session recordings, exposure of sensitive call data, and intermittent service disruptions affecting recording functionality.
If Mitigated
Limited impact due to network segmentation and access controls preventing external exploitation, though internal threats remain possible.
🎯 Exploit Status
Oracle describes it as 'easily exploitable' with no authentication required, suggesting straightforward exploitation via crafted HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update October 2021
Vendor Advisory: https://www.oracle.com/security-alerts/cpuoct2021.html
Restart Required: Yes
Instructions:
1. Download the appropriate patch from My Oracle Support 2. Review patch documentation for prerequisites 3. Apply patch following Oracle's installation procedures 4. Restart affected services 5. Verify patch application
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to the Provision API to only trusted internal networks
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_NETWORK" port protocol="tcp" port="API_PORT" accept'
firewall-cmd --reload
Access Control Lists
windowsImplement network ACLs to limit HTTP access to the Provision API
netsh advfirewall firewall add rule name="Block_ISR_API" dir=in action=block protocol=TCP localport=API_PORT remoteip=any
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the Oracle Communications Interactive Session Recorder from untrusted networks
- Deploy web application firewall (WAF) rules to block suspicious HTTP requests to the Provision API endpoint
🔍 How to Verify
Check if Vulnerable:
Check if Oracle Communications Interactive Session Recorder version 6.4 is installed and if the Provision API is accessible via HTTP without authenticationCheck Version:
Check Oracle product documentation for version verification commands specific to Interactive Session RecorderVerify Fix Applied:
Verify patch installation via Oracle's patch verification tools and confirm the October 2021 Critical Patch Update is applied📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to Provision API endpoints
- Multiple failed authentication attempts followed by successful API calls
- Unexpected data modification or deletion events in session recording logs
Network Indicators:
- HTTP traffic to Provision API from unexpected source IPs
- Unusual patterns of API calls outside normal business hours
- High volume of requests to specific Provision API endpoints
SIEM Query:
source="oracle_isr" AND (http_method="POST" OR http_method="PUT" OR http_method="DELETE") AND uri_path="/provision/api/*" AND src_ip NOT IN (trusted_networks)