How to remediate – Opera < 8.01 Multiple Vulnerabilities

1. Introduction

Opera versions earlier than 8.01 contain multiple vulnerabilities. These weaknesses could allow a malicious website to perform actions it shouldn’t, such as displaying fake dialog boxes or accessing sensitive data. Systems running affected Opera browsers are at risk. This vulnerability has the potential for moderate impact on confidentiality, integrity and availability of user data.

2. Technical Explanation

The vulnerabilities stem from flaws in Opera’s handling of web content and internal processes. An attacker could exploit these issues by crafting a malicious webpage that targets an unpatched browser. CVE-2003-1420, CVE-2005-1475 and related BID entries describe the specific problems.

• Root cause: The Opera version does not properly validate input from websites, allowing for cross-site scripting (XSS) attacks. It also has issues with dialog box spoofing and unauthorized data access via XMLHttpRequest objects.
• Exploit mechanism: An attacker could create a webpage containing JavaScript code that exploits the XSS vulnerabilities to steal cookies or redirect users to malicious sites. They might also use it to display fake prompts asking for credentials.
• Scope: Opera versions prior to 8.01 are affected, running on Windows and other supported platforms.

3. Detection and Assessment

You can check if a system is vulnerable by identifying the installed Opera version. A thorough assessment involves scanning for XSS vulnerabilities.

• Quick checks: Open Opera and go to Help > About Opera. Note the version number. If it’s below 8.01, the system is likely vulnerable.
• Scanning: Nessus plugin ID 27946 or similar XSS scanners may detect these vulnerabilities. These are examples only.
• Logs and evidence: Look for suspicious JavaScript activity in Opera’s logs (location varies by OS). Event IDs related to cross-site scripting attempts could indicate exploitation.

opera --version

4. Solution / Remediation Steps

The solution is to update Opera to version 8.01 or later.

4.1 Preparation

• Ensure you have an internet connection for downloading the latest installer. A roll back plan is to restore from backup if issues occur.
• A standard change window may be required depending on your organisation’s policies, with approval from IT management.

4.2 Implementation

1. Step 1: Download the Opera 8.01 or later installer from the official Opera website.
2. Step 2: Run the installer and follow the on-screen instructions to upgrade Opera.

4.3 Config or Code Example

There are no configuration changes needed, only an update of the application.

Before

Opera version < 8.01

After

Opera version 8.01 or later

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help mitigate this type of vulnerability.

• Practice 1: Patch cadence – Regularly update software, including browsers, to address known vulnerabilities.
• Practice 2: Least privilege – Run the browser with limited user privileges to reduce the impact if exploited.

4.5 Automation (Optional)

Automated deployment of Opera updates can be achieved using package management tools like SCCM or Intune, but this is dependent on your environment.

# Example PowerShell script snippet for SCCM/Intune deployment:
# Install-Package -Name "Opera" -Version "latest"

5. Verification / Validation

Confirm the update was successful and that the vulnerabilities are no longer present.

• Post-fix check: Open Opera and go to Help > About Opera. Verify the version number is 8.01 or later.
• Re-test: Run a vulnerability scan using Nessus plugin ID 27946 (or similar) and confirm it no longer reports the vulnerabilities.
• Smoke test: Browse several trusted websites to ensure normal functionality remains intact.
• Monitoring: Monitor browser logs for any unusual JavaScript activity or errors that might indicate an attempted exploit.

opera --version

6. Preventive Measures and Monitoring

Implement security baselines and monitoring to prevent future occurrences.

• Baselines: Update your browser security baseline to require Opera 8.01 or later.
• Asset and patch process: Implement a regular patch review cycle for all software, including browsers.

7. Risks, Side Effects, and Roll Back

Updating Opera may cause compatibility issues with some websites or extensions.

• Roll back: Restore Opera from backup if issues occur, or uninstall the new version and reinstall the previous version.

8. References and Resources

Refer to official sources for more information.

• Vendor advisory or bulletin: Opera Changelog
• NVD or CVE entry: CVE-2003-1420, CVE-2005-1475
• Product or platform documentation relevant to the fix: None available.