8.8
CWE
787 121
Advisory Published
Updated

CVE-2020-7065: mb_strtolower (UTF-32LE): stack-buffer-overflow at php_unicode_tolower_full

First published: Tue Mar 17 2020(Updated: )

A vulnerability was found in PHP versions 7.3.x below 7.3.16 and 7.4.x below 7.4.34, while using mb_strtolower() function with UTF-32LE encoding, certain invalid strings could cause PHP to overwrite stack-allocated buffer. This could lead to memory corruption, crashes and potentially code execution.

Credit: security@php.net security@php.net

Affected SoftwareAffected VersionHow to fix
redhat/rh-php73-php<0:7.3.20-1.el7
0:7.3.20-1.el7
PHP PHP>=7.3.0<7.3.16
PHP PHP>=7.4.0<7.4.4
Debian Debian Linux=10.0
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.10
Canonical Ubuntu Linux=20.04
Tenable Tenable.sc<5.19.0
PHP PHP<7.3.16
7.3.16
redhat/php<7.3.16
7.3.16
redhat/php<7.4.4
7.4.4
debian/php7.4
7.4.33-1+deb11u5
7.4.33-1+deb11u7

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-7065?

    CVE-2020-7065 is a vulnerability in PHP versions 7.3.x below 7.3.16 and 7.4.x below 7.4.4 that could lead to memory corruption, crashes, and potentially code execution.

  • What causes CVE-2020-7065?

    CVE-2020-7065 is caused by using the mb_strtolower() function with UTF-32LE encoding and certain invalid strings.

  • How can CVE-2020-7065 be exploited?

    CVE-2020-7065 can be exploited by crafting specially crafted strings to trigger the vulnerability in PHP.

  • Which versions of PHP are affected by CVE-2020-7065?

    PHP versions 7.3.x below 7.3.16 and 7.4.x below 7.4.4 are affected by CVE-2020-7065.

  • How can CVE-2020-7065 be remediated?

    To remediate CVE-2020-7065, update PHP to version 7.3.16 or 7.4.4 or later.

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