#VU23779 Deserialization of Untrusted Data in Squiz Matrix - CVE-2019-19373

Vulnerability identifier: #VU23779

Vulnerability risk: High

CVSSv4.0: 8.1 [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:U/U:Amber]

CVE-ID: CVE-2019-19373

CWE-ID: CWE-502

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Squiz Matrix
Web applications / CMS

Vendor: Squiz.net

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data passed via the "page_remote_content_[pageid]_sq_remote_input_file_names" POST parameter in "packages/cms/page_templates/page_remote_content/page_remote_content.inc". A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Squiz Matrix: 5.5.0.0 - 5.5.3.2

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External links
https://packetstormsecurity.com/files/155671/Squiz-Matrix-CMS-5.5.x.x-Code-Execution-Information-Disclosure.html
https://seclists.org/fulldisclosure/2019/Dec/34
https://matrix.squiz.net/releases/5.5/5.5.3.3
https://zxsecurity.co.nz/wp-content/uploads/2019/12/ZX%20Security%20Advisory%20-%20Squiz%20Matrix%20CMS%20-%20Multiple%20Vulnerabilities.pdf

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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.