Bugtraq mailing list archives

Re: AVG 7 granting Everyone Full Control to updated files... even its drivers


From: Matti Haack <m.haack () haack-it de>
Date: Wed, 8 Mar 2006 12:52:56 +0100

Grisoft   issued   a   fix   for   the Problem, wich installs with the
latest Update:

--- AVG Anti-Virus Update ---
(03/08/2006)

********************************
**     AVG Anti-Virus 7.1     **
********************************

--- information about Update ---

Update Summary:

* fix for the too relaxed permission after the update
* changes in scanning core, mainly new generic getection of some 
  polymorphic viruses and support for more run-time compression 
  algorithms
* ability to set up exclusions for the detection of potentially 
  unwanted programs
* in firewall, ability to define new global rules and to step back 
  firewall configuration


Update your AVG Anti-Virus 7.1 using one of the following methods:

 - Use the Update feature in AVG Anti-Virus 7.1 to perform your 
   update - select "Internet", and AVG will prompt you with the 
   update files appropriate for your installation.

 - Use the appropriate link from below to download the Update file 
   to your hard drive. Then access the Update feature 
   in AVG Anti-Virus 7.1 - select "Folder" and indicate the location 
   of the Update file which you have downloaded. 

Update file for all Program versions (size 4094665 bytes):
  http://www.grisoft.cz/softw/70/update/u7fwf3845z.bin

Update file for all Program versions (size 6974519 bytes):
  http://www.grisoft.cz/softw/70/update/u7f3845z.bin

Update file for all Program versions (size 1378218 bytes):
  http://www.grisoft.cz/softw/70/update/u7hlpf3795z.bin

Update file for all Program versions (size 2638096 bytes):
  http://www.grisoft.cz/softw/70/update/u7lngextf3785z.bin



All available Update files, including previous versions, 
may be found at the following link:
  http://www.grisoft.com/update/index.php?lng=com

-- 
GRISOFT

There is more here: http://www.dslreports.com/forum/remark,15601404

Basically, a first time install of AVG 7 will have default
permissions. \Program Files\Grisoft\AVG Free has inherited
permissions from \Program Files. This is preferred, because lower
privileged accounts can't damage it.

Once any files are updated, the permissions are changed to
"Everyone" with "Full Control" on the updated files, and will change
the owner to whomever is logged in. Even limited users become
owners. That does not stop at \Program Files\Grisoft\AVG Free, it
will even do that to AVG's drivers in %windir%\system32\drivers.


- 
Matti Haack - Hit Haack IT Service Gmbh
Poltlbauer Weg 4, D-94036 Passau
+49 851 50477-22 Fax: +49 851 50477-29
http://www.haack-it.de



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