1. Introduction
The Avotus CDR mm Arbitrary File Retrieval vulnerability allows an attacker to read arbitrary files on a remote host running the Avotus CDR mm service. This could allow sensitive information, such as passwords and configuration details, to be exposed. Systems affected are those running the Avotus CDR mm service. A successful exploit could compromise confidentiality of data stored on the system.
2. Technical Explanation
The vulnerability occurs because the script attempts to force the remote Avotus CDR mm service to include a specified file in a network request. An attacker can manipulate this process to read files like /etc/passwd from the server’s filesystem. The attack requires network access to the Avotus CDR mm service and does not require authentication.
- Root cause: The script does not properly validate user-supplied input, allowing an attacker to specify an arbitrary file path.
- Exploit mechanism: An attacker sends a crafted request to the Avotus CDR mm service including the desired file path in the request. If successful, the contents of the requested file are returned as part of the response. For example, an attacker could attempt to read /etc/passwd by sending a malicious request containing that filepath.
- Scope: Affected systems include those running the Avotus CDR mm service.
3. Detection and Assessment
To confirm if a system is vulnerable, check the version of the Avotus CDR mm service installed. A thorough assessment involves attempting to retrieve known sensitive files.
- Quick checks: Check the product version using the application’s UI or command-line interface.
- Scanning: Nessus plugin ID 168239 may detect this vulnerability, but results should be verified manually.
- Logs and evidence: Examine Avotus CDR mm service logs for any unusual file access attempts or errors related to file inclusion.
# Example command placeholder:
# No specific command available without knowing the Avotus CDR mm CLI. Check application UI.
4. Solution / Remediation Steps
Apply the vendor-provided fix for this issue to all affected systems.
4.1 Preparation
- Ensure you have access to the latest version of the product from the vendor. A roll back plan involves restoring the backed-up configuration and reverting to the previous product version.
- A change window may be required for planned downtime. Approval from system owners is recommended.
4.2 Implementation
- Step 1: Download and install the latest patch or update provided by Avotus.
4.3 Config or Code Example
Before
# No specific configuration example available as this is a script-level vulnerability. The fix involves updating the Avotus CDR mm service itself.
After
# After applying the patch, the vulnerable code will be replaced with a secure version that validates user input and prevents arbitrary file access.
4.4 Security Practices Relevant to This Vulnerability
Several security practices can help prevent this type of vulnerability.
- Practice 2: Least privilege reduces the impact if an attacker gains access. Ensure services run with only the necessary permissions.
4.5 Automation (Optional)
# No automation example available as this requires patching the Avotus CDR mm service itself. Automation would depend on your patch management system.
5. Verification / Validation
Confirm the fix by checking the product version and attempting to retrieve a sensitive file.
- Post-fix check: Verify that the Avotus CDR mm service is running the updated version provided by the vendor.
- Monitoring: Monitor Avotus CDR mm service logs for any failed file access attempts or errors related to input validation.
# Post-fix command and expected output:
# Check application UI for updated version number (e.g., Version 2.5.1)
6. Preventive Measures and Monitoring
Update security baselines and implement input validation checks in your development pipelines.
- Baselines: Update your security baseline to include the latest version of Avotus CDR mm service with the applied patch.
- Pipelines: Add static application security testing (SAST) tools to your CI/CD pipeline to identify potential input validation vulnerabilities early in the development process.
- Asset and patch process: Implement a regular patch review cycle for all critical systems, including Avotus CDR mm service.
7. Risks, Side Effects, and Roll Back
Applying the patch may require downtime. A roll back plan involves restoring the backed-up configuration.
- Risk or side effect 1: Patching may cause temporary service disruption. Schedule patching during a maintenance window to minimize impact.
- Roll back: Restore the backed-up Avotus CDR mm service configuration and revert to the previous product version if necessary.
8. References and Resources
- Vendor advisory or bulletin: [email protected]
- NVD or CVE entry: No CVE available at the time of writing.