SB2018111313 - Privilege escalation in Microsoft Exchange Server
Published: November 13, 2018
Security Bulletin ID
SB2018111313
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Man-in-the-middle attack (CVE-ID: CVE-2018-8581)
The vulnerability allows a remote attacker to gain elevated privileges on the target system.
The vulnerability exists due to use of a registry key exists called HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlLsa and lack of loopback check. A remote unauthenticated attacker can conduct a man-in-the-middle attack to forward an authentication request to a Microsoft Exchange Server, thereby allowing impersonation of another Exchange user and gain SYSTEM privileges.
Remediation
Install update from vendor's website.