Main Vulnerability Database Vulnerabilities #VU48853

Information disclosure in Microsoft Exchange Server - CVE-2020-17143

Published: December 8, 2020 / Updated: December 14, 2020

Vulnerability identifier: #VU48853

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-17143

CWE-ID: CWE-200

Exploitation vector: Remote access

Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in Microsoft Exchange. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.

Affected software

Microsoft Exchange Server

How to mitigate CVE-2020-17143

Install updates from vendor's website.

Links to Public Exploits and PoC-codes

Exploit #4928 - Microsoft Exchange Server OWA OneDriveProUtilities GetWacUrl XML External Entity Processing Information Disclosure Vulnerability (December 14, 2020)

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17143

Related Security Bulletins

Multiple vulnerabilities in Microsoft Exchange