How to remediate – Opera < 7.03 Multiple Vulnerabilities

1. Introduction

Opera versions prior to 7.03 contain multiple security flaws. These vulnerabilities could allow an attacker to execute code on a user’s computer by tricking them into visiting a malicious website. This affects systems running affected Opera browser versions and poses a risk to confidentiality, integrity, and availability of data.

2. Technical Explanation

The older versions of Opera are vulnerable due to several issues including cross-site scripting (XSS) and buffer overflows. An attacker needs to create a specially crafted website and convince a user running an affected version of Opera to visit it. This allows the attacker to run arbitrary code on the victim’s machine.

• Root cause: The software does not properly validate input or handle memory allocation, leading to exploitable flaws.
• Exploit mechanism: An attacker hosts a malicious website containing exploit code. When a user visits this site with an affected Opera version, the code executes on their system. For example, a buffer overflow could overwrite critical program data.
• Scope: Affected platforms are those running Opera browser versions less than 7.03.

3. Detection and Assessment

You can check if systems are vulnerable by determining the installed Opera version. A thorough assessment involves scanning for known vulnerabilities.

• Quick checks: Open Opera and go to Help > About Opera. Note the version number. If it is less than 7.03, the system is vulnerable.
• Scanning: Nessus plugin ID 21846 can identify this vulnerability as an example. Other scanners may have similar signatures.
• Logs and evidence: Check for unusual network connections or process activity originating from Opera. There are no specific event IDs associated with these vulnerabilities.

opera --version

4. Solution / Remediation Steps

To fix this issue, upgrade to Opera 7.03 or a newer version.

4.1 Preparation

• The roll back plan is to restore the backed-up profile if the upgrade fails.
• A change window may be needed depending on your organisation’s policies, and approval from a system owner might be required.

4.2 Implementation

1. Step 1: Download Opera 7.03 or newer from the official Opera website.
2. Step 2: Close all instances of Opera.
3. Step 3: Run the installer and follow the on-screen instructions to complete the upgrade.

4.3 Config or Code Example

There is no config or code change involved; this requires a software update.

Before

Opera version less than 7.03

After

Opera version 7.03 or newer

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help prevent this type of issue. Keeping software up-to-date is essential, as is using a patch management process.

• Practice 1: Implement a regular patch cadence for all software, including browsers.
• Practice 2: Use least privilege principles to limit the impact if an attacker gains control of a user’s system.

4.5 Automation (Optional)

No suitable automation script is available.

5. Verification / Validation

Confirm that the upgrade was successful by checking the Opera version again. Re-run the detection method to verify the vulnerability is no longer present.

• Post-fix check: Open Opera and go to Help > About Opera. The version number should be 7.03 or higher.
• Re-test: Run the `opera –version` command again; it should report a version of 7.03 or newer.
• Smoke test: Verify that users can still browse websites without issues and access key features.
• Monitoring: Monitor for unusual network activity originating from Opera as an example.

opera --version

6. Preventive Measures and Monitoring

Update security baselines to require a minimum Opera version. Consider using software inventory tools to track browser versions.

• Baselines: Update your security baseline or policy to specify a minimum acceptable Opera version (7.03).
• Pipelines: Implement automated checks in CI/CD pipelines to ensure that deployed systems have the required browser version.
• Asset and patch process: Review and update your asset inventory and patch management processes to include browsers.

7. Risks, Side Effects, and Roll Back

Upgrading Opera may cause compatibility issues with some websites or extensions. If problems occur, restore the backed-up user profile.

• Risk or side effect 2: User disruption due to changes in the browser interface. Mitigation is to provide training and documentation.
• Roll back: Restore the backed-up Opera user profile. Reinstall the previous version of Opera if necessary.

8. References and Resources

Refer to official Opera documentation for more information.

• Vendor advisory or bulletin: http://web.archive.org/web/20170714204641/http://www.opera.com:80/docs/changelogs/windows/703/
• NVD or CVE entry: CVE-2002-2414, CVE-2003-1387, CVE-2003-1397, CVE-2003-1420
• Product or platform documentation relevant to the fix: No specific documentation available.