PT-2020-4383 · Microsoft · Exchange Server

Suresh C · Published 2020-10-13 · Updated 2023-12-31 · CVE-2020-16969

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

AV:N/AC:M/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions: Microsoft Exchange Server (affected versions not specified)

Description: The issue is related to an information disclosure vulnerability in how Microsoft Exchange validates tokens when handling certain messages. This could allow a remote attacker to gain unauthorized access to protected information. The vulnerability can be exploited by including specially crafted OWA messages that could be loaded from an attacker-controlled URL, providing an information disclosure tactic used in web beacons and other types of tracking systems.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

BDU:2020-04896

BDU:2020-05460

CVE-2020-16969

Affected Products

Exchange Server

References · 8

• https://osv.dev/vulnerability/CVE-2020-16969 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-05460 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-16969 · Security Note
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16969 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-04896 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2020-16969 · Vendor Advisory
• https://cybersecurity-help.cz/vdb/SB2020101346 · Note
• https://t.me/cibsecurity/15356 · Telegram Post