CVE-2018-10547 : Vulnerability Insights and Analysis

PHP versions prior to 5.6.36, 7.0.x before 7.0.30, 7.1.x before 7.1.17, and 7.2.x before 7.2.5 have a vulnerability in the ext/phar/phar_object.c file allowing for Reflected XSS on PHAR error pages.

Understanding CVE-2018-10547

This CVE involves a security vulnerability in PHP versions prior to 5.6.36, 7.0.x before 7.0.30, 7.1.x before 7.1.17, and 7.2.x before 7.2.5, which can lead to Reflected XSS on PHAR error pages.

What is CVE-2018-10547?

The vulnerability exists in the ext/phar/phar_object.c file in PHP versions mentioned.
It allows for Reflected XSS on the PHAR error pages (403 and 404) when request data for a .phar file is provided.
This vulnerability is a result of an incomplete fix for CVE-2018-5712.

The Impact of CVE-2018-10547

Attackers can exploit this vulnerability to execute malicious scripts in the context of a user's browser.
This could lead to unauthorized access to sensitive information or account takeover.

Technical Details of CVE-2018-10547

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability allows for Reflected XSS on PHAR error pages in PHP versions mentioned.

Affected Systems and Versions

PHP versions prior to 5.6.36, 7.0.x before 7.0.30, 7.1.x before 7.1.17, and 7.2.x before 7.2.5 are affected.

Exploitation Mechanism

Attackers can exploit this vulnerability by providing request data for a .phar file, leading to Reflected XSS on PHAR error pages.

Mitigation and Prevention

Protecting systems from CVE-2018-10547 is crucial to maintaining security.

Immediate Steps to Take

Update PHP to versions 5.6.36, 7.0.30, 7.1.17, or 7.2.5 to mitigate the vulnerability.
Regularly monitor for security advisories and patches from PHP and relevant vendors.

Long-Term Security Practices

Implement input validation and output encoding to prevent XSS attacks.
Educate users on safe browsing practices and the risks of executing untrusted code.

Patching and Updates

Apply security patches promptly to ensure systems are protected from known vulnerabilities.