Cross-site request forgery in Microsoft Exchange Server - CVE-2021-24085
Published: February 9, 2021 / Updated: June 10, 2021
Vulnerability identifier: #VU50471
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/U:Green
CVE-ID: CVE-2021-24085
CWE-ID: CWE-352
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: Microsoft
Affected software:
Microsoft Exchange Server
Microsoft Exchange Server
Detailed vulnerability description
The vulnerability allows a remote attacker to perform cross-site request forgery attacks.
The vulnerability exists due to insecure generation of CSRF tokens for office-addins installation within the HasValidCanary function inside of the Canary15 class. A remote user can trick the victim to visit a specially crafted web page and escalate privileges on the server.
How to mitigate CVE-2021-24085
Install update from vendor's website.