Vulnerability identifier: #VU9869

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description
The vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability exists due to improper input validation in .phar when processing 404 response. A remote attacker can create a specially crafted link, rick tyhe victim into opening it and execute arbitrary HTML and script code in victim's browser in context of vulnerable website.

Mitigation
Update to version 7.0.27,7.1.13 or 7.2.1.

Vulnerable software versions

PHP: 7.2.0, 7.1.0 - 7.1.12, 7.0.0 - 7.0.26

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External links
http://bugs.php.net/bug.php?id=74782

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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