Path traversal in PHP



Published: 2021-09-29 | Updated: 2021-09-30
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-21706
CWE-ID CWE-36
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		PHP
Universal components / Libraries / Scripting languages

Vendor PHP Group

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Absolute Path Traversal

EUVDB-ID: #VU56905

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-21706

CWE-ID: CWE-36 - Absolute Path Traversal

Exploit availability: No

Description

The vulnerability allows a remote attacker overwrite files on the system.

The vulnerability exists due to insufficient filtration of file names in the php_zip_make_relative_path() function on Windows systems. A remote attacker can construct a specially crafted ZIP archive, which once extracted by the ZipArchive::extractTo() function, can overwrite files outside of the destination directory.

Successful exploitation of the vulnerability may allow an attacker to overwrite arbitrary files on the system with privileges of the web server, but requires that the web application is running on Windows.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PHP: 7.4 - 7.4.23, 7.3 - 7.3.30, 8.0.0 - 8.0.10

CPE2.3 External links

http://www.php.net/ChangeLog-7.php#7.4.24
http://bugs.php.net/bug.php?id=81420
http://www.php.net/ChangeLog-7.php#7.3.31

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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