#VU23560 Arbitrary file upload in class.upload.php - CVE-2019-19576

Vulnerability identifier: #VU23560

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2019-19576

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
class.upload.php
Web applications / Modules and components for CMS

Vendor: Colin Verot

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file uploads in "class.upload.php" in "verot.net". A remote attacker can upload and execute arbitrary file on the server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

class.upload.php: 1.0.0 - 2.0.3

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External links
https://github.com/getk2/k2/commit/d1344706c4b74c2ae7659b286b5a066117155124
https://github.com/jra89/CVE-2019-19576
https://github.com/verot/class.upload.php/commit/5a7505ddec956fdc9e9c071ae5089865559174f1
https://github.com/verot/class.upload.php/commit/db1b4fe50c1754696970d8b437f07e7b94a7ebf2
https://github.com/verot/class.upload.php/compare/1.0.2...1.0.3
https://github.com/verot/class.upload.php/compare/2.0.3...2.0.
https://www.verot.net/php_class_upload.htm

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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. However, proof of concept for this vulnerability is available.