CVE-2017-7272 : Vulnerability Insights and Analysis

PHP through version 7.1.11 has a vulnerability that can lead to SSRF attacks when applications accept specific arguments in fsockopen or pfsockopen functions.

Understanding CVE-2017-7272

This CVE involves a potential SSRF vulnerability in PHP applications using fsockopen or pfsockopen functions.

What is CVE-2017-7272?

This CVE affects PHP versions up to 7.1.11, allowing SSRF attacks due to how fsockopen handles hostname arguments.

The Impact of CVE-2017-7272

The vulnerability could be exploited to perform SSRF attacks, potentially leading to unauthorized access to internal systems.

Technical Details of CVE-2017-7272

PHP through 7.1.11 enables potential SSRF in applications that accept an fsockopen or pfsockopen hostname argument with an expectation that the port number is constrained.

Vulnerability Description

The vulnerability arises from fsockopen using the port number specified in the hostname argument instead of the expected port number in the function's second argument.

Affected Systems and Versions

PHP versions up to 7.1.11

Exploitation Mechanism

Exploitation involves manipulating the hostname argument in fsockopen to bypass port restrictions and potentially access internal resources.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Update PHP to a secure version that addresses the SSRF vulnerability.
Review and restrict access to sensitive internal systems.

Long-Term Security Practices

Regularly monitor and update PHP versions to mitigate known vulnerabilities.
Implement proper input validation and security controls to prevent SSRF attacks.

Patching and Updates

Apply patches or updates provided by PHP to fix the SSRF vulnerability.