Rewterz Threat Advisory – Microsoft Exchange Server 2010 / 2013 / 2016 / 2019 Multiple Vulnerabilities

SEVERITY: High

ANALYSIS SUMMARY

Multiple vulnerabilities have been reported in Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, and Microsoft Exchange Server 2019, which can be exploited by malicious users to disclose potentially sensitive information and by malicious people to compromise a vulnerable system.

CVE-2019-0588
An information disclosure vulnerability exists when the Microsoft Exchange PowerShell API grants calendar contributors more view permissions than intended.

CVE-2019-0586
A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory.

IMPACT

Memory Corruption
System access
Exposure of sensitive information

AFFECTED PRODUCTS

Microsoft Exchange Server 2010
Microsoft Exchange Server 2013
Microsoft Exchange Server 2016
Microsoft Exchange Server 2019

REMEDIATION

Vendor has released updates for the following products:.

• Microsoft Exchange Server 2019 (KB4471389):
  https://www.microsoft.com/downloads/details.aspx?familyid=66370ba9-e5f6-4d38-9264-0e65bb1f1e76
• Microsoft Exchange Server 2016 Cumulative Update 10 (KB4471389):
  https://www.microsoft.com/downloads/details.aspx?familyid=ec2cdba1-1ea5-4c9a-81fc-453f50f739dd

• Microsoft Exchange Server 2016 Cumulative Update 11 (KB4471389):
  https://www.microsoft.com/downloads/details.aspx?familyid=68f7ef1c-e0a5-4628-91ee-2fd963287807

• Microsoft Exchange Server 2013 Cumulative Update 21 (KB4471389):
  https://www.microsoft.com/downloads/details.aspx?familyid=ccf6c5e6-e26b-4ed8-a868-4cf45162f566

• Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 25 (KB4468742):
  https://www.microsoft.com/downloads/details.aspx?familyid=5d92eec0-5607-4ec0-9222-b79129a95c16