TITLE:
VMware NAT Networking Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA18162

VERIFY ADVISORY:
http://secunia.com/advisories/18162/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From local network

SOFTWARE:
VMware Workstation 5.x
http://secunia.com/product/5080/
VMware Workstation 4.x
http://secunia.com/product/1445/
VMware ACE 1.x
http://secunia.com/product/6593/
VMware GSX Server 1.x
http://secunia.com/product/1443/
VMware GSX Server 2.x
http://secunia.com/product/1439/
VMware GSX Server 3.x
http://secunia.com/product/3315/
VMware Player 1.x
http://secunia.com/product/6594/
VMware Workstation 2.x
http://secunia.com/product/1442/
VMware Workstation 3.x
http://secunia.com/product/1441/

DESCRIPTION:
Tim Shelton has reported a vulnerability in VMware, which potentially
can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error in "vmnat.exe" (Windows)
and "vmnet-natd" (Linux) when handling certain FTP requests. This can
be exploited to cause a heap-based buffer overflow via specially
crafted "eprt" and "port" FTP requests sent from the guest OS.

Successful exploitation allows arbitrary code execution on the host
OS, but requires that NAT networking is enabled on the virtual
machine.

The vulnerability has been reported in the following products:
* VMware Workstation 5.5 and prior.
* VMware GSX Server 3.2 and prior.
* VMware ACE 1.0.1 and prior.
* VMware Player 1.0 and prior.

SOLUTION:
Update to the latest versions.
http://www.vmware.com/download

Alternatively, disable NAT networking on the virtual machine.
http://www.vmware.com/support/kb/enduser/std_adp.php?p_faqid=2002

PROVIDED AND/OR DISCOVERED BY:
Tim Shelton

ORIGINAL ADVISORY:
VMware:
http://www.vmware.com/support/kb/enduser/std_adp.php?p_faqid=2000

Tim Shelton:
http://lists.grok.org.uk/pipermail/full-disclosure/2005-December/040442.html

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