CVE-2019-19326 Explained : Impact and Mitigation

Silverstripe CMS versions up to 4.4.4 are susceptible to web cache poisoning due to manipulation of HTTP Cache Headers. This can lead to the inclusion of malicious HTTP headers in cached responses.

Understanding CVE-2019-19326

In Silverstripe CMS versions up to 4.4.4, a vulnerability exists that can result in web cache poisoning if HTTP Cache Headers are utilized.

What is CVE-2019-19326?

This CVE affects Silverstripe CMS sites using HTTP Cache Headers, allowing manipulation of headers like X-Original-Url and X-HTTP-Method-Override, leading to potential web cache poisoning.

The Impact of CVE-2019-19326

The vulnerability can enable attackers to inject malicious HTTP headers into cached responses, potentially causing unexpected behavior for consumers of the cached data.

Technical Details of CVE-2019-19326

Silverstripe CMS versions up to 4.4.4 are affected by this vulnerability.

Vulnerability Description

Websites using HTTP Cache Headers in Silverstripe CMS can be exploited through manipulation of specific headers, potentially resulting in web cache poisoning.

Affected Systems and Versions

Product: Silverstripe CMS
Vendor: N/A
Versions: Up to 4.4.4

Exploitation Mechanism

Attackers manipulate X-Original-Url and X-HTTP-Method-Override headers to inject malicious HTTP headers into cached responses.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2019-19326.

Immediate Steps to Take

Disable HTTP Cache Headers if not essential for website functionality.
Regularly monitor and audit HTTP headers for any suspicious activity.

Long-Term Security Practices

Implement strict header whitelists to prevent unauthorized modifications.
Stay informed about security best practices and updates related to web cache poisoning.

Patching and Updates

Apply patches and updates provided by Silverstripe CMS to mitigate the vulnerability.