Arbitrary file upload in Microsoft Sharepoint Enterprise Server
CVE-2020-1023
A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account. Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint. The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.037 (89.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000
Affected products
- Microsoft Sharepoint Enterprise Server — versions 2016
- Microsoft Sharepoint Enterprise Server 2016
- Microsoft Sharepoint Foundation — versions 2013 Service Pack 1
- Microsoft Sharepoint Foundation 2013 Service Pack 1
- Microsoft Sharepoint Server — versions 2019
- Microsoft Sharepoint Server 2019
- Microsoft Sharepoint Enterprise Server — versions 2016
- Microsoft Sharepoint Foundation — versions 2013
- Microsoft Sharepoint Server — versions 2019
Weakness classification (CWE)
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1023 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2020-1023?
- CVE-2020-1023 is a high-severity vulnerability in Microsoft Sharepoint Enterprise Server, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2020-05-21.
- How severe is CVE-2020-1023?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-1023 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.