cbcvebase.
CVE-2020-1102
published 2020-05-21

CVE-2020-1102: A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker…

PriorityP357high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
5.22%
92.5th percentile
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.

Affected

6 ranges
VendorProductVersion rangeFixed in
microsoftmicrosoft_sharepoint_enterprise_server_2016>= 16.0.0 < publicationpublication
microsoftmicrosoft_sharepoint_server_2019>= 16.0.0 < publicationpublication
microsoftsharepoint_enterprise_server——
microsoftsharepoint_server——
msrcmicrosoft_sharepoint_enterprise_server_2016——
msrcmicrosoft_sharepoint_server_2019——

Detection & IOCsextracted from sources · hover to see the quote

  • →CVE-2020-1102 is exploited by uploading a specially crafted SharePoint application package; monitor SharePoint for unexpected or unauthorized application package uploads. ↗
  • →Successful exploitation results in code execution under the SharePoint application pool identity and SharePoint server farm account; monitor for anomalous process activity spawned from SharePoint worker processes (w3wp.exe). ↗
  • →CVE-2020-1102 is one of three SharePoint RCEs (alongside CVE-2020-1023, CVE-2020-1024, CVE-2020-1069) triggered via malicious application package upload; correlate SharePoint app-package upload events across all four CVEs. ↗
  • ·The vulnerability exists specifically in how SharePoint checks the source markup of application packages; the fix corrects this markup validation logic. ↗
  • ·As of the advisory publication, CVE-2020-1102 had not been publicly disclosed or actively exploited in the wild, reducing immediate urgency but not eliminating risk. ↗

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.06.5MEDIUMAV:N/AC:L/Au:S/C:P/I:P/A:P
vendor_msrc8.8CRITICAL
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