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Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Information Disclosure

MS-ISAC ADVISORY NUMBER:

2018-068

DATE(S) ISSUED:

06/20/2018

OVERVIEW:

Multiple vulnerabilities have been discovered in Microsoft Exchange Server, which could allow for information disclosure. Microsoft Exchange Server is an email server software product. Successful exploitation of these vulnerabilities could result in an attacker obtaining sensitive information on the affected server or result in a denial-of-service condition.

THREAT INTELLIGENCE:

There are currently no reports of these vulnerabilities being exploited in the wild.

SYSTEMS AFFECTED:

  • Microsoft Exchange Server 2010 Service Pack 3
  • Microsoft Exchange Server 2013
  • Microsoft Exchange Server 2016

RISK:

Government:
  • Large and medium government entities: MEDIUM
  • Small government entities: MEDIUM
Businesses:
  • Large and medium business entities: MEDIUM
  • Small business entities: MEDIUM
Home Users:
N/A

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in Microsoft Exchange Server, which could allow for information disclosure. These vulnerabilities exist within the Oracle Outside In Technology software development kits (SDKs) utilized by Microsoft Exchange Server. Oracle Outside In Technology is a document extraction, conversion and viewing technology that can access the information in more than 600 file formats.

Details of these vulnerabilities are as follows:

  • A remote user can exploit a flaw in the Oracle Outside In Technology Outside In Filters component to access data and cause partial denial of service conditions. (CVE-2018-2768, CVE-2018-2806)
  • A remote user can exploit a flaw in the Oracle Outside In Technology Outside In Image Export SDK component to access data and cause partial denial of service conditions. (CVE-2018-2801)

Successful exploitation of these vulnerabilities could result in an attacker obtaining sensitive information on the affected server, or result in a denial-of-service condition.

RECOMENDATIONS:

We recommend the following actions be taken:

  • Apply appropriate patches or appropriate mitigations provided by Microsoft to vulnerable systems immediately after appropriate testing
  • Run all software as a non-privileged user (one without administrative rights) to diminish the effects of a successful attack.
  • Remind all users not to visit untrusted websites or follow links provided by unknown or untrusted sources.
  • Inform and educate users regarding threats posed by hypertext links contained in emails or attachments especially from untrusted sources
  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

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