Advisory Details

November 21st, 2017

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

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.
ADDITIONAL DETAILS	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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