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Category:   Application (Generic)  >   VMware ESXi Vendors:   VMware
VMware ESXi Buffer Overflows in Processing VNC Packets Let Remote Authenticated Users Execute Arbitrary Code and an Input Validation Flaw in the Host Client Lets Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1040024
SecurityTracker URL:  http://securitytracker.com/id/1040024
CVE Reference:   CVE-2017-4933, CVE-2017-4940, CVE-2017-4941   (Links to External Site)
Updated:  Dec 19 2017
Original Entry Date:  Dec 19 2017
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Several vulnerabilities were reported in VMware ESXi. A remote authenticated user can execute arbitrary code on the target system. A remote user can conduct cross-site scripting attacks.

A remote authenticated user can send specially crafted VNC packets to trigger a stack overflow and execute arbitrary code within the target virtual machine [CVE-2017-4941].

Systems with VNC manually enabled in the virtual machine's '.vmx' configuration file are affected.

Versions 5.5 and 6.0 are affected.

A remote authenticated user can send specially crafted VNC packets to trigger a heap overflow and execute arbitrary code within the target virtual machine [CVE-2017-4933].

Systems with VNC manually enabled in the virtual machine's '.vmx' configuration file are affected.

Versions 5.5 and 6.0 are not affected.

The ESXi Host Client does not properly filter HTML code from user-supplied input before displaying the input [CVE-2017-4940]. A remote user can cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the Host Client interface and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Lilith Wyatt of Cisco Talos, another member of Cisco Talos, and Alain Homewood of Insomnia Security reported these vulnerabilities.

Impact:   A remote authenticated user can execute arbitrary code on the target system.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with the Host Client interface, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Solution:   VMware has issued a fix (ESXi550-201709101-SG, ESXi550-201709102-SG, ESXi600-201711101-SG, ESXi600-201711103-SG, ESXi650-201710401-BG, ESXi650-201712103-SG).

The VMware advisory is available at:

https://www.vmware.com/security/advisories/VMSA-2017-0021.html

Vendor URL:  www.vmware.com/security/advisories/VMSA-2017-0021.html (Links to External Site)
Cause:   Boundary error, Input validation error

Message History:   None.


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