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
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SecurityTracker Alert ID: 1040024 |
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SecurityTracker URL: http://securitytracker.com/id/1040024
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CVE Reference:
CVE-2017-4933, CVE-2017-4940, CVE-2017-4941
(Links to External Site)
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Updated: Dec 19 2017
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Original Entry Date: Dec 19 2017
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Impact:
Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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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.
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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.
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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
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Vendor URL: www.vmware.com/security/advisories/VMSA-2017-0021.html (Links to External Site)
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Cause:
Boundary error, Input validation error
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Message History:
None.
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Source Message Contents
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[Original Message Not Available for Viewing]
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