#VU54753 Improper validation of integrity check value in Microsoft SharePoint Server and Microsoft SharePoint Foundation - CVE-2021-34519
Published: July 13, 2021 / Updated: July 19, 2021
Vulnerability identifier: #VU54753
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-34519
CWE-ID: CWE-354
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerable software:
Microsoft SharePoint Server
Microsoft SharePoint Foundation
Microsoft SharePoint Server
Microsoft SharePoint Foundation
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to missing integrity check on update downloads for SharePoint Help updates. A remote attacker can perform MitM attack and replace the files contents during update downloads.
Remediation
Install updates from vendor's website.