What is the vulnerability ID of this bug?

The vulnerability ID of this bug is CVE-2021-21706.

What is the title of this bug?

The title of this bug is Fixed bug (ZipArchive::extractTo extracts outside of destination) (CVE-2021-21706).

What is the severity of CVE-2021-21706?

The severity of CVE-2021-21706 is medium.

Which versions of PHP are affected by CVE-2021-21706?

PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24, and 8.0.x below 8.0.11 are affected by CVE-2021-21706.

How can CVE-2021-21706 be exploited?

In a Microsoft Windows environment, an attacker can trick ZipArchive::extractTo into writing a file outside the target directory when extracting a ZIP file.

Vulnerability/
CVE-2021-21706

medium

6.5

CWE

22 24

4/10/2021

16/9/2024

CVE-2021-21706: ZipArchive::extractTo may extract outside of destination dir

First published: Mon Oct 04 2021(Updated: )

In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions.

Credit: security@php.net

Affected Software	Affected Version	How to fix
PHP PHP	>=7.3.0<7.3.31
PHP PHP	>=7.4.0<7.4.24
PHP PHP	>=8.0.0<8.0.11
Microsoft Windows
	<8.1.0	8.1.0

Remedy

https://bugs.php.net/bug.php?id=81420

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Reference Links

Frequently Asked Questions

What is the vulnerability ID of this bug?
The vulnerability ID of this bug is CVE-2021-21706.
What is the title of this bug?
The title of this bug is Fixed bug (ZipArchive::extractTo extracts outside of destination) (CVE-2021-21706).
What is the severity of CVE-2021-21706?
The severity of CVE-2021-21706 is medium.
Which versions of PHP are affected by CVE-2021-21706?
PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24, and 8.0.x below 8.0.11 are affected by CVE-2021-21706.
How can CVE-2021-21706 be exploited?
In a Microsoft Windows environment, an attacker can trick ZipArchive::extractTo into writing a file outside the target directory when extracting a ZIP file.

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