Vulnerability identifier: #VU28318

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11048

CWE-ID: CWE-400

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 a denial of service (DoS) attack.

The vulnerability exists due to the way PHP handles long filenames or field names during file upload. A remote attacker can supply an overly long filename to the application that will lead PHP engine to try to allocate oversized memory storage, hit the memory limit and stop processing the request, without cleaning up temporary files created by upload request. This will lead to accumulation of uncleaned temporary files exhausting the disk space on the target server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PHP: 7.4.0 - 7.4.5, 7.3.0 - 7.3.17, 7.2.0 - 7.2.30

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External links
http://bugs.php.net/bug.php?id=78875
http://bugs.php.net/bug.php?id=78876
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OBA3TFZSP3TB5N4G24SO6BI64RJZXE3D/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XMDUQ7XFONY3BWTAQQUD3QUGZT6NFZUF/

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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.