Advisory Details

February 12th, 2019

Microsoft SharePoint EntityInstanceIdEncoder Deserialization of Untrusted Data Remote Code Execution Vulnerability

CVE ID	CVE-2019-0604
CVSS SCORE	9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	SharePoint
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft SharePoint. Authentication is required to exploit this vulnerability. The specific flaw exists within the EntityInstanceIdEncoder class. 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 Administrator.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0604
DISCLOSURE TIMELINE	2018-09-23 - Vulnerability reported to vendor 2019-02-12 - Coordinated public release of advisory 2019-12-18 - Advisory Updated
CREDIT	Markus Wulftange (@mwulftange)

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