VMware Workstation and Fusion Network Address Translation Service Integer Overflow Vulnerability

A vulnerability in the VMware Network Address Translation (NAT) service feature of VMware Workstation and Fusion could allow an authenticated, remote attacker to cause an out-of-bounds read condition on a targeted system.

The vulnerability is due to improper processing of IPv6 packets by the VMware NAT service of the affected software. An attacker could exploit this vulnerability by sending crafted IPv6 packets to the targeted system. A successful exploit could trigger an integer overflow condition, which may lead to an out-of-bounds read condition on the system. A successful exploit of this vulnerability, used in conjunction with other vulnerabilities, could allow the attacker to execute arbitrary code on the host system.

VMware has confirmed the vulnerability and released software updates.

CVE Number – CVE-2017-4950

Analysis

To exploit this vulnerability, an attacker must send malicious IPv6 packets to the targeted system. This access requirement may reduce the likelihood of a successful exploit.

For a successful exploit to occur, IPv6 mode must be enabled on systems running an affected software version. By default, IPv6 mode for VMware NAT service is not enabled.

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 monitor affected systems.

Vendor Announcements

VMware has released a security advisory at the following link: VMSA-2018-0005

Affected Products

VMware Fusion – 8.1 (.0, .1) | 8.0 (.0, .0.1, .0.2, .1, .2) | 8.5 (.0, .1, .2, .3, .4, .5, .6, .7, .8, .9) | 10.0 (.0, .1) | 10.1 (.0)

VMware Workstation Player – 12.1 (.0, .1) | 12.0 (.0, .1) | 12.5 (.0, .1, .2, .3, .4, .5, .6, .7, .8) | 14.0 (.0) | 14.1 (.0)

VMware Workstation Pro – 12.0 (.0, .1) | 12.1 (.0, .1) | 12.5 (.0, .1, .2, .3, .4, .5, .6, .7, .8) | 14.0 (.0) | 14.1 (.0)

Fixed Software

VMware has released software updates at the following links:




Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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