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Multiple Vulnerabilities in VMware Products Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2017-031

DATE(S) ISSUED:

03/30/2017

OVERVIEW:

Multiple vulnerabilities have been discovered in VMware ESXi, VMware Workstation Pro/Player, and VMware Fusion Pro/Fusion. VMware ESXi is a purpose-built bare-metal hypervisor. VMware Workstation Pro and VMware Workstation Player are applications that can allow for multiple operating systems as virtual machines on a single PC. VMware Fusion Pro and VMware Fusion allow users to run Windows and hundreds of other operating systems on a Mac, without rebooting. Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution in the context of the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE:

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

SYSTEMS AFFECTED:

  • ESXi Versions prior to 6.5
  • Workstation Versions prior to 12.5.5
  • Fusion Versions prior to 8.5.6

RISK:

Government:
  • Large and medium government entities: HIGH
  • Small government entities: HIGH
Businesses:
  • Large and medium business entities: HIGH
  • Small business entities: HIGH
Home Users:
LOW

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in VMware ESXi, VMware Workstation Pro/Player, and VMware Fusion Pro/Fusion. The most severe of these vulnerabilities could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

  • A heap buffer overflow vulnerability that may allow an attacker to execute code on the host. (CVE-2017-4902)

  • An uninitialized stack memory vulnerability usage that may allow an attacker to execute code on the host (CVE-2017-4903)

  • An uninitialized memory usage vulnerability that may allow an attacker to execute code on the host (CVE-2017-4904)

  • An uninitialized memory usage that may lead to an information leak. (CVE-2017-4905)

Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution in the context of the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

RECOMENDATIONS:

We recommend the following actions be taken:

  • Apply appropriate patches provided by Google to vulnerable systems immediately after appropriate testing.

  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.

  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.

  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

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