Php Version 5640 Vulnerabilities Verified __full__ -

Although 5.6.40 was a "security fix" release, newer research has identified critical flaws that still impact this version because it no longer receives official patches: CVE-2024-4577 (CGI Argument Injection) Critical (CVSS 9.8)

While many RCEs were patched in 5.6.40, the version is frequently targeted by exploits like (specifically when paired with NGINX and php-fpm), which allows unauthenticated remote attackers to execute arbitrary code on the server. Information Disclosure (PHAR Extension) :

Versions of Docker images running PHP 5.6.40 often contain critical vulnerabilities in bundled libraries like libcurl (e.g., stack-based buffer overflows). Recommendations

| Aspect | PHP 5.6.40 | |--------|-------------| | Security support | since Dec 2018 | | Confirmed CVEs affecting version | 50+ (including post-2019 unpatched) | | Remote Code Execution possible | Yes (CVE-2019-11043, CVE-2016-1903) | | Recommended for production | Absolutely not | | Migration target | PHP 8.2 / 8.3 | php version 5640 vulnerabilities verified

This is one of the most critical vulnerabilities affecting PHP 5.6.40. It is a buffer underflow in php-fpm (the Fast Process Manager for PHP). When PHP is run in an Nginx + php-fpm environment with certain non-default configurations, a remote attacker could exploit this flaw to execute arbitrary code on the server. An exploit was released shortly after the public disclosure.

to look out for. Would you like a list of the most frequent "breaking changes" between PHP 5.6 and 8.x?

: Multiple instances of heap-based buffer overflows were found in multibyte string regular expression functions, potentially allowing a remote attacker to compromise a system via crafted regular expressions. Although 5

This vulnerability occurs when the PHP garbage collector fails to properly clean up objects, allowing an attacker to execute arbitrary code on the server. This vulnerability can be exploited to gain RCE and execute malicious code.

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.

Threat actors actively scan the internet for servers exposing PHP 5.6.40 signatures. Legacy environments are favored targets due to three specific factors: It is a buffer underflow in php-fpm (the

5.6.40 from an older 5.6 release, it does address these verified issues CVE-2016-10166 : A use-after-free vulnerability in imagescale (GD extension). CVE-2019-9023 : Multiple heap buffer overflows in regular expression functions. CVE-2019-9021 : Heap buffer overflow in phar_detect_phar_fname_ext (PHAR extension). CVE-2019-9020 : Heap out-of-bounds read in xmlrpc_decode() Security Guide & Mitigation

What and hosting environment is your PHP 5.6.40 running on? Are you using PHP-FPM with Nginx, or mod_php with Apache?