SB2018100925 - Multiple vulnerabilities in Microsoft Exchange Server

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2018-8265)

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

The vulnerability exists due to an error when processing email messages within Microsoft Exchange. A remote unauthenticated attacker can send a specially crafted email, trick the victim into performing multiple actions while replying to the message and execute arbitrary code on the target system.

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

2) Privilege escalation (CVE-ID: CVE-2018-8448)

The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The vulnerability exists due to improper handling of web requests within Microsoft Exchange Outlook Web Access (OWA). A remote unauthenticated attacker can send a specially crafted email message containing a malicious link, trick the victim into clicking it and gain elevated privileges to conduct further attacks.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8265
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8448