VMware Remote Console e.x.p build-158248 - Format String

[DSECRG-09-053] VMware Remote Console - format string vulnerability

http://www.dsecrg.com/pages/vul/show.php?id=153



VMrc vulnerable to format string attacks. Exploitation of this issue may lead to arbitrary code execution on the system where VMrc is installed.



Digital Security Research Group [DSecRG] Advisory DSECRG-09-053





Application: VMware Remoute Console

Version: e.x.p build-158248

Vendor URL: http://vmware.com

Bugs: Format String Vulnerabilitys

Exploits: YES (PoC)

Reported: 07.08.2009

Vendor response: 13.08.2009

Date of Public Advisory: 09.04.2010

CVE: CVE-2009-3732

VSA: VMSA-2010-0007

Authors: Alexey Sintsov of

Digital Security Research Group [DSecRG] (research [at] dsecrg [dot] com)







Description

********



VMware Remote Console Plug-in can be installed from WEB

interface of VMware vSphere. This software contains of ActiveX

objects and executable files for remote console of guest OS.

VMrc vulnerable to format string attacks. Exploitation of this issue

may lead to arbitrary code execution on the system where VMrc is installed.





Details

*******



Attacker can make shortcut with special parameters for

vmware-vmrc.exe and bad MOID or HOST parameter. If a user try to use

this shortcut to connect to vSphere server he will see next message

box:



"Error opening the remote virtual

machine HOST\MOID: The object has already been deleted

or has not been completely created."



If user name or password will be incorrect the user also gets error

message box.



Parameters HOST and MOID are addicted to format injection.



Also this vuln. can be exploited remotely by special crafted html page.



ActiveX element: clsid:B94C2238-346E-4C5E-9B36-8CC627F35574



Attacker can rewrite stack data and may be it's possible to code

execution.







Example(shortcut):

*****************



C:\Program Files\Common Files\VMware\VMware Remote Console Plug-in>vmware-vmrc.exe -u vmware_user -h HOST -M AAAA:%x.%x.%x.%x.:BBBB



VMDlg::ShowDialog: Error opening the remote virtual machine

HOST\AAAA:3455600.78138a94.100012b2.28e27b0.:BBBB:



Example(ActiveX):

****************



objectVMRC.connect ("host" ,"username" ,"password",

"%x:%x:%x:%x:%x:%x:%x:%x:%x" ,"X" ,2);





Fix Information

***************

VMware has released the following patch for

ESX 4.0: ESX400-200911223-UG



Also this issue solved in vCenter 4.0 Update 1



References

**********



http://dsecrg.com/pages/vul/show.php?id=153

http://lists.vmware.com/pipermail/security-announce/2010/000090.html



About

*****



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Digital Security Research Group focuses on web application and database

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Contact: research [at] dsecrg [dot] com

http://www.dsecrg.com