Stack-based buffer overflow in PHP - CVE-2020-7065

Vulnerability identifier: #VU26260

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-7065

CWE-ID: CWE-121

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 php_unicode_tolower_full() function, as demonstrated by the mb_strtolower() call. A remote attacker can pass specially crafted data to the application that uses affected function, trigger stack-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
Debian Linux
Amazon Linux AMI
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Fedora
Red Hat Software Collections
Tenable.sc
php7 (Alpine package)
php7.4 (Ubuntu package)
php
php7.3 (Debian package)
rh-php73-php (Red Hat package)

Install updates from vendor's website.

PHP - addressed in versions 7.3.16, 7.4.4
Tenable.sc - update to 5.19.0
php7 (Alpine package) - update to 7.3.16-r0
php7.4 (Ubuntu package) - update to 7.4.3-4ubuntu1.1
php - addressed in versions 7.3.16-1.fc30, 7.3.16-1.fc31, 7.4.4-1.fc32
php7.3 (Debian package) - update to 7.3.19-1~deb10u1
rh-php73-php (Red Hat package) - update to 7.3.20-1.el7

• https://bugs.php.net/bug.php?id=79371
• https://www.php.net/ChangeLog-7.php#7.3.16
• https://www.php.net/ChangeLog-7.php#7.4.4

• Multiple vulnerabilities in PHP
• Gentoo update for PHP
• Ubuntu update for PHP
• Amazon Linux AMI update for php73
• Stack-based buffer overflow in php7 (Alpine package)
• Red Hat Software Collections 1 for RHEL 7.7 update for rh-php73-php
• Multiple vulnerabilities in Tenable.sc
• Debian update for php7.3
• Red Hat Enterprise Linux 8 update for the php:7.3 module
• Fedora 30 update for php
• Fedora 31 update for php
• Fedora 32 update for php