Heap-based buffer overflow in PHP - CVE-2022-31627

Vulnerability identifier: #VU65292

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-31627

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the finfo_buffer() PHP function. A remote attacker can pass an overly long string to the script that allocates the buffer, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

PHP
Gentoo Linux
Amazon Linux AMI
Oracle Solaris
Ubuntu
Fedora
Junos OS
EasyApache
php8.1-fpm (Ubuntu package)
php8.1-cli (Ubuntu package)
libapache2-mod-php8.1 (Ubuntu package)
php8.1-mysql (Ubuntu package)
php8.1-pgsql (Ubuntu package)
php8.1-cgi (Ubuntu package)
php
php8.1

Install updates from vendor's website.

PHP - addressed in versions 8.0.21, 8.1.8
EasyApache - update to 4 2022-7-13
php8.1-fpm (Ubuntu package) - update to 8.1.2-1ubuntu2.2
php8.1-cli (Ubuntu package) - update to 8.1.2-1ubuntu2.2
libapache2-mod-php8.1 (Ubuntu package) - update to 8.1.2-1ubuntu2.2
php8.1-mysql (Ubuntu package) - update to 8.1.2-1ubuntu2.2
php8.1-pgsql (Ubuntu package) - update to 8.1.2-1ubuntu2.2
php8.1-cgi (Ubuntu package) - update to 8.1.2-1ubuntu2.2
php - update to 8.1.8-1.fc36
php8.1 - update to 8.1.14-1
Junos OS - update to 23.2R1

• https://bugs.php.net/bug.php?id=81723
• https://www.php.net/ChangeLog-8.php#8.1.8
• https://www.php.net/ChangeLog-8.php#8.0.21

• Remote code execution in PHP finfo_buffer
• cPanel EasyApache 4 update for PHP
• Ubuntu update for php8.1
• Gentoo update for PHP
• Oracle Solaris update for third-party software
• Juniper Junos OS J-Web update for PHP
• Amazon Linux AMI update for php8.1
• Fedora 36 update for php