SB2020071422 - Multiple vulnerabilities in Microsoft SharePoint

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2020-1454)

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 in the SharePoint Server. A remote authenticated 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) Spoofing attack (CVE-ID: CVE-2020-1443)

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in the SharePoint server. A remote authenticated attacker can spoof page content.

3) Input validation error (CVE-ID: CVE-2020-1444)

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

The vulnerability exists due to insufficient validation of user-supplied input when the Microsoft SharePoint software improperly parses specially crafted email messages. A remote attacker can send a specially crafted email, then convince the recipient to perform multiple actions while replying to the message and execute arbitrary code on the target system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1454
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1443
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1444