SB2020111035 - Multiple vulnerabilities in Microsoft Exchange Server

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2020-17083)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Buffer overflow (CVE-ID: CVE-2020-17084)

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error. A remote user can execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

3) Input validation error (CVE-ID: CVE-2020-17085)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17083
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17084
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17085