SB2019091107 - Multiple vulnerabilities in Microsoft Exchange

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2019-1266)

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 Outlook Web App (OWA). A remote attacker can trick the victim to click on 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-2019-1233)

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

The vulnerability exists due to a boundary in Microsoft Exchange Server. A remote attacker can send a specially crafted email to the affected server, trigger memory corruption and perform denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1266
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1233