Advisory Details

November 21st, 2017

VMware Workstation NAT IP Fragment Reassembly Heap-based Buffer Overflow Privilege Escalation Vulnerability

ZDI-17-921
ZDI-CAN-4909

CVE ID CVE-2017-4934
CVSS SCORE 6.2, (AV:L/AC:H/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS VMware
AFFECTED PRODUCTS VMware Workstation
VULNERABILITY DETAILS


This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of VMware Workstation. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the handling of the NAT IP Fragment Reassembly. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to elevate privileges and execute arbitrary code under the context of SYSTEM in the host OS.

VENDOR RESPONSE VMware has issued an update to correct this vulnerability. More details can be found at:
https://www.vmware.com/security/advisories/VMSA-2017-0018.html
DISCLOSURE TIMELINE
  • 2017-06-16 - Vulnerability reported to vendor
  • 2017-11-21 - Coordinated public release of advisory
CREDIT Jun Mao of Tencent PC Manager
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