Php Version 5640 Vulnerabilities Verified

// DANGEROUS $user_object = unserialize($_COOKIE['user_data']);

The 5.6.40 environment is susceptible to memory corruption issues where a remote attacker can read sensitive memory contents or cause a system hang by providing out-of-range integer values to certain built-in functions. Data leakage and Denial of Service (DoS). Exploitation Scenarios Vulnerability Type Common Vector SQL Injection Unsanitized AJAX parameters or form inputs. Unauthorized database access. Command Injection Use of risky functions like OS-level command execution. Improper output escaping of user data. Session hijacking or credential theft. Recommended Actions Immediate Upgrade: Migrate to a supported version, such as PHP 8.2, 8.3, or 8.4 Disable Risky Functions: If an immediate upgrade is impossible, add shell_exec disable_functions directive in your Input Validation: validate and sanitize

Security Assessment Report: PHP 5.6.40 Vulnerabilities Verified Critical Release Date: January 10, 2019 End of Life (EOL): December 31, 2018 Executive Summary

PHP 5.6.40 is significant because it was the last release before the PHP team ceased all active support and security patching for the 5.x branch. php version 5640 vulnerabilities verified

| 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 |

attacks. If an application passes untrusted user input into the unserialize()

The exif and fileinfo extensions in PHP 5.6.40 fail to properly validate data bounds when parsing specially crafted JPEG or ELF files. An attacker can upload a malicious image to a web application that extracts EXIF metadata, causing the PHP process to crash or leak sensitive memory contents to the HTTP response. 3. MBSTRING Buffer Overflow (CVE-2020-7060) Type: Global Buffer Overflow Component: ext/mbstring Impact: Denial of Service / Memory Corruption Unauthorized database access

The exif_read_data() function, used to read metadata from images, suffers from unauthenticated remote read/write vulnerabilities. Attackers can upload an image with corrupted EXIF headers to read sensitive server memory or trigger execution states. 3. OpenSSL and Curl Integration Vulnerabilities

Inability to strictly enforce modern TLS protocols (like TLS 1.3), forcing connections to downgrade to exploitable protocols (like TLS 1.0 or 1.1).

Implement a WAF (like Cloudflare, AWS WAF, or ModSecurity) to detect and block malicious requests targeting known PHP 5.6 vulnerabilities. Session hijacking or credential theft

Modern PHP versions (7.x and 8.x) introduced significantly stricter security measures and improved encryption protocols that 5.6.40 lacks. This makes legacy systems more vulnerable to common exploits like SQL injection and malware infections. Vulners.com Risks of Remaining on PHP 5.6.40

function, attackers can inject malicious serialized strings to execute arbitrary PHP code on the server. Input Validation Weakness: