CVE-2020-7067 : Vulnerability Insights and Analysis

PHP versions 7.2.x below 7.2.30, 7.3.x below 7.3.17, and 7.4.x below 7.4.5 are affected by an Out-of-bounds Read vulnerability in the urldecode() function.

Understanding CVE-2020-7067

This CVE involves a vulnerability in PHP versions that can lead to accessing memory locations beyond the allocated memory due to incorrect array index usage.

What is CVE-2020-7067?

In PHP versions 7.2.x below 7.2.30, 7.3.x below 7.3.17, and 7.4.x below 7.4.5, a flaw exists in the urldecode() function when PHP is compiled with EBCDIC support, allowing access to memory locations past the allocated memory.

The Impact of CVE-2020-7067

This vulnerability has a CVSS base score of 7.5, indicating a high severity issue with a significant impact on confidentiality.

Technical Details of CVE-2020-7067

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

Vulnerability Description

The vulnerability arises from the incorrect use of signed numbers as array indexes, leading to out-of-bounds memory access in PHP.

Affected Systems and Versions

PHP 7.2.x versions below 7.2.30
PHP 7.3.x versions below 7.3.17
PHP 7.4.x versions below 7.4.5

Exploitation Mechanism

The vulnerability can be exploited by manipulating the urldecode() function in PHP to access memory locations beyond the allocated memory.

Mitigation and Prevention

Protecting systems from CVE-2020-7067 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update PHP to versions 7.2.30, 7.3.17, or 7.4.5 to mitigate the vulnerability.
Disable EBCDIC support if not required to reduce the attack surface.

Long-Term Security Practices

Regularly monitor PHP security advisories and update systems promptly.
Implement secure coding practices to prevent similar vulnerabilities in the future.

Patching and Updates

Apply patches provided by PHP Group to address the vulnerability.