Microsoft SharePoint TypeConverter Deserialization of Untrusted Data Remote Code Execution Vulnerability

April 15th, 2020
ZDI-20-468 ZDI-CAN-10027

CVE ID

CVE-2020-0932

CVSS Score

8.8 AV:N/AC:L/PR:L/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 affected installations of Microsoft SharePoint Server. Authentication is required to exploit this vulnerability.

The specific flaw exists within the use of TypeConverter classes. 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 SharePoint service at high integrity.

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-2020-0932

Disclosure Timeline

  • 2020-02-07 - Vulnerability reported to vendor
  • 2020-04-15 - Coordinated public release of advisory
  • 2020-10-27 - Advisory Updated

Credit

Anonymous

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