Executive Summary

This vulnerability is a Deserialization of Untrusted Data issue in Mikado-Themes Halstein, specifically in versions before 1.8. It allows Object Injection, meaning that an attacker can manipulate serialized data to inject malicious objects during the deserialization process.

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Compliance Impact

The vulnerability in the Mikado-Themes Halstein WordPress theme allows unauthenticated attackers to perform malicious code injection, SQL injection, path traversal, denial of service, and other attacks. Such exploitation can lead to unauthorized access, data breaches, or data manipulation.

These security risks can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and breaches.

Therefore, if exploited, this vulnerability could lead to violations of these regulations due to potential data compromise or loss of data integrity.

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Detection Guidance

The vulnerability affects WordPress Halstein Theme versions prior to 1.8 and involves PHP Object Injection. Detection typically involves identifying if the vulnerable theme version is in use.

While no specific commands are provided in the resources, common detection steps include checking the installed theme version on your WordPress site.

• Use WP-CLI command to check the theme version: wp theme list --status=active
• Manually verify the theme version in the WordPress admin dashboard under Appearance > Themes.
• Monitor web server logs for suspicious activity indicative of PHP Object Injection attempts.

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Mitigation Strategies

The primary immediate mitigation step is to update the Halstein WordPress theme to version 1.8 or later, where the vulnerability is patched.

If updating is not possible immediately, users should seek assistance from their hosting provider or web developer to apply mitigation rules or temporary protections.

Patchstack provides mitigation rules that can block attacks targeting this vulnerability until the theme is updated.

• Update the Halstein theme to version 1.8 or later.
• Apply available mitigation rules from Patchstack or similar security providers.
• Consult with your hosting provider or web developer for additional protective measures.

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Impact Analysis

The vulnerability can allow an attacker to execute arbitrary code or perform unauthorized actions by injecting malicious objects during deserialization. This can lead to system compromise, data breaches, or other security issues depending on the context in which the vulnerable software is used.

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