Microsoft SharePoint Business Data Connectivity Service Deserialization of Untrusted Data Remote Code Execution Vulnerability

September 10th, 2019
ZDI-19-812 ZDI-CAN-8159

CVE ID

CVE-2019-1257

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. Authentication is required to exploit this vulnerability.

The specific flaw exists within the Business Data Connectivity Service. A crafted request can trigger the deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the SharePoint application pool identity.

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-2019-1257

Disclosure Timeline

  • 2019-07-03 - Vulnerability reported to vendor
  • 2019-09-10 - Coordinated public release of advisory

Credit

Markus Wulftange (@mwulftange)

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