#VU25592 Incorrect default permissions in PHP - CVE-2020-7063

Vulnerability identifier: #VU25592

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-7063

CWE-ID: CWE-276

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to incorrect default permissions for files and folders that are set during the Phar::buildFromIterator() call when adding files into tar archive. A local user can extract files from tar archive and gain access to otherwise restricted information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PHP: 7.2.0 - 7.2.27, 7.3.0alpha1 - 7.3.14, 7.4.0 - 7.4.2

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External links
https://www.php.net/ChangeLog-7.php
https://bugs.php.net/bug.php?id=79082

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.