CVE-2018-10545 : What You Need to Know

A vulnerability has been detected in earlier versions of PHP (before 5.6.35, 7.0.x before 7.0.29, 7.1.x before 7.1.16, and 7.2.x before 7.2.4) that allows bypassing opcache access controls by exploiting dumpable FPM child processes.

Understanding CVE-2018-10545

This CVE identifies a security flaw in PHP versions prior to 5.6.35, 7.0.x before 7.0.29, 7.1.x before 7.1.16, and 7.2.x before 7.2.4.

What is CVE-2018-10545?

This vulnerability enables an attacker to bypass opcache access controls by leveraging dumpable FPM child processes in PHP.

The Impact of CVE-2018-10545

The vulnerability allows unauthorized users to access sensitive information from the process memory of other users' PHP applications.

Technical Details of CVE-2018-10545

This section provides in-depth technical insights into the CVE.

Vulnerability Description

The issue arises from dumpable FPM child processes, which can be exploited to bypass opcache access controls.

Affected Systems and Versions

PHP versions before 5.6.35
PHP 7.0.x before 7.0.29
PHP 7.1.x before 7.1.16
PHP 7.2.x before 7.2.4

Exploitation Mechanism

The vulnerability occurs due to the execution of a PR_SET_DUMPABLE prctl call in fpm_unix.c, allowing unauthorized access to sensitive data.

Mitigation and Prevention

Protect your systems from CVE-2018-10545 with the following measures:

Immediate Steps to Take

Update PHP to versions 5.6.35, 7.0.29, 7.1.16, or 7.2.4 to patch the vulnerability.
Monitor system logs for any suspicious activity.

Long-Term Security Practices

Implement least privilege access to restrict user permissions.
Regularly audit and update PHP and related software.

Patching and Updates

Apply security patches promptly to ensure protection against known vulnerabilities.