Microsoft Exchange Memory Corruption Vulnerability [CVE-2018-8154]

A vulnerability in Microsoft Exchange could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerability is due to improper memory operations that are performed by the affected software. An attacker could exploit the vulnerability by sending an email that submits malicious input to the affected software. A successful exploit could allow the attacker to execute arbitrary code with the privileges of the System user and compromise the system completely.

Microsoft confirmed the vulnerability and released software updates.

CVE number – CVE-2018-8154

Analysis
  • To exploit this vulnerability, the attacker must send a malicious request to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources.

    Microsoft addressed this vulnerability by correcting how the affected software handles objects in memory.

Safeguards
  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only trusted users to have network access.

    Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.

    Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

    Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

    Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

    Administrators are advised to monitor affected systems.

Vendor Announcements

Affected Version

Microsoft Exchange Server 2010 (SP3 RU 21) | 2013 (SP1, CU19, CU20) | 2016 (CU8, CU9)

Fixed Software
  • Microsoft customers can obtain updates directly by using the links in the Microsoft Security Update Guide. These updates are also distributed by Windows automatic update features and are available from the Microsoft Update Catalog. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.





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