Advisory Details

November 11th, 2021

Orckestra C1 CMS Composite Deserialization of Untrusted Data Remote Code Execution Vulnerability

CVE ID	CVE-2021-34992
CVSS SCORE	8.8, AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Orckestra
AFFECTED PRODUCTS	C1 CMS
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Orckestra C1 CMS. Authentication is required to exploit this vulnerability. The specific flaw exists within Composite.dll. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the service account.
ADDITIONAL DETAILS	Orckestra has issued an update to correct this vulnerability. More details can be found at: https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.11
DISCLOSURE TIMELINE	2021-10-25 - Vulnerability reported to vendor 2021-11-11 - Coordinated public release of advisory
CREDIT	Le Ngoc Anh - Sun* Cyber Security Research Team

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