all user-supplied data before it reaches the database or sensitive functions. If you're planning a migration, I can help you with a compatibility checklist common syntax changes
On Debian-based systems, the dpkg -l | grep php command will show the version of installed PHP packages. For Debian 8 "Jessie", a version of 5.6.40+dfsg-0+deb8u2 or higher would indicate that the fixes for the March 2019 vulnerabilities are in place. Updates addressing the issues from 2020 would be at version 5.6.40+dfsg-0+deb8u11 or higher.
I can provide a tailored to help you move away from PHP 5.6 to a modern, supported environment. PHP 5.6.x < 5.6.40 Multiple vulnerabilities. | Tenable® php version 5640 vulnerabilities verified
Because PHP is written in C, memory management errors frequently manifest as buffer overflows or out-of-bounds reads. A series of issues validated against 5.6.x frameworks include: CVE Identifier Vulnerable Component Attack Mechanism & Severity mbstring extension
Do you have a currently deployed in front of this environment? Share public link all user-supplied data before it reaches the database
| CVE ID | Vulnerability Type | Description | Risk Level | Base Score | | :--- | :--- | :--- | :--- |:--- | | | Buffer Underflow / Remote Code Execution (RCE) | A buffer underflow in php-fpm leading to RCE in specific Nginx+php-fpm configurations, one of the most severe for this version. | Critical | 9.8 (CVSS 3.1) | | CVE-2019-9022 | Out-of-bounds Read / Denial of Service (DoS) | Hostile DNS responses could misuse memcpy , causing a read past an allocated buffer and leading to DoS or information disclosure. | High | 7.5 | | CVE-2019-9640 | Uninitialized Read / Information Disclosure | An uninitialized read in exif_process_IFD_in_MAKERNOTE within the EXIF component could lead to information disclosure. | Medium | 5.3 | | CVE-2019-9641 | Uninitialized Read / Information Disclosure | An uninitialized read in exif_process_IFD_in_TIFF within the EXIF component could lead to information disclosure. | Medium | 5.3 | | CVE-2020-7064 | Out-of-bounds Read | A one-byte out-of-bounds read that can be used to leak sensitive information from memory or cause a crash. | Medium | 5.3 | | CVE-2020-7066 | Input Validation Error (URL Truncation) | An issue in get_headers() that truncates URLs at a null ( \0 ) character, which could lead to incorrect assumptions and sending information to a wrong server. | Medium | 5.3 | | CVE-2020-7067 | Use-After-Free | A use-after-free vulnerability that could potentially be exploited to cause a crash or execute arbitrary code. | High | 7.5 | | CVE-2019-11044 | Input Validation Error | link() function accepts filenames with embedded null ( \0 ) byte, treating them as terminating at that byte, leading to path handling bypasses. | Medium | 5.3 | | CVE-2019-11045 | Input Validation Error | DirectoryIterator class accepts filenames with embedded null ( \0 ) byte, causing path truncation and potential security bypasses. | Medium | 5.3 | | CVE-2019-11046 | Buffer Under-read / Memory Disclosure | bcmath extension can be tricked into reading beyond allocated memory via crafted strings that appear numeric, leading to information disclosure. | Medium | 7.5 | | CVE-2019-9637, CVE-2019-9638, CVE-2019-9639 | EXIF Component Vulnerabilities | A set of issues within the EXIF component that could lead to various impacts, including DoS and information disclosure. | Medium | 5.3-7.5 |
According to industry vulnerability databases and security audits, PHP 5.6.40 is affected by multiple severe flaws. While the core language engine itself had patches applied, the extensions and bundled libraries it relies on contain several documented vulnerabilities. 1. Integer Underflow and Buffer Overflows (GD Library) Updates addressing the issues from 2020 would be
Popular platforms like WordPress, Drupal, and Joomla have dropped support for PHP 5.6. Running PHP 5.6.40 forces you to run outdated versions of these content management systems. This creates a compounding effect: your underlying language framework is vulnerable, and your web application layer is vulnerable. Compliance and Legal Violations
The 5.6.40 release targeted specific vulnerabilities in PHP's core functionality, particularly within the Phar extension and compatibility layers. 1. Phar Buffer Overflow (CVE-2019-6977) Heap-based Buffer Overflow Component: ext/phar/phar_object.c Impact: Remote Code Execution (RCE)