SRC-2020-0024 : Microsoft SharePoint Server TOCTOU ControlParameter Binding Remote Code Execution Vulnerability
CVE ID: CVE-2020-16951
CVSS Score: 8.6, (/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L/E:P/RL:O/RC:C)
Affected Vendors: Microsoft
Affected Products: Microsoft SharePoint Server
This vulnerability allows remote attackers to execute arbitrary code on affected installations of SharePoint Server. Authentication is required to exploit this vulnerability.
The specific flaw exists within the WebPartEditingSurfacePage class. The issue results from the lack of proper validation of user-supplied control markup. An attacker can leverage this vulnerability to execute code in the context of the local Administrator.
Microsoft has issued an update to correct this vulnerability. More details can be found at: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-16951
- 2020-08-13 – Sent to Microsoft
- 2020-11-10 – Coordinated public release of advisory
Proof of Concept:
Credit: This vulnerability was discovered by Steven Seeley (mr_me) of Qihoo 360 Vulcan Team and Yuhao Weng (@cjm00nw)