On Mon, Feb 20, 2012 at 2:28 PM, Jeffrey Walton <noloader () gmail com>
wrote:
Hi Mitja,
On Fri, Feb 17, 2012 at 11:32 AM, ACROS Security Lists <lists () acros si>
wrote:
This blog post reveals a bit of our research and provides an advance
notification of
a largely unknown remote exploit technique on Windows. More
importantly, it provides
instructions for protecting your computers from this technique while
waiting for the
affected software to correct its behavior.
http://blog.acrossecurity.com/2012/02/downloads-folder-binary-planting.html
$ Look for the presence of any *.dll files in the Downloads
$ folder and do the same as in the previous step.
$ Delete all files from the Downloads folder.
I don't believe a PE/PE+ executable needs a DLL extension to be loaded
by LoadLibrary and friends.
They do not need a specific extension for LoadLibrary() to work.
This is more having to do with dll search paths which has been a known
exploit vector for a long while now. I do know Win7 fixes this by just
not checking the local directories when it loads a .exe, I am unsure
if Vista does the same, and I am positive WinXP checks local
directories first since I've done so under WinXP.
They might have something interesting with the msiexec.exe with it
checking the local directory first. I would call this a programming
issue by the installer not specifying a full path and no validations.
If a dev was really concerned when they called LoadLibrary() they
could just use SetDllDirectory(), GetDllDirectory(), and friends to
manipulate where they look for dlls.
Since I responded to something in this subject, I would like to share
my personal opinion this doesn't really seem like a major exploit
vector. It appears to fall to usual do and do not of basic security.
Obviously downloading files from a suspect website is a security risk.
Perhaps a scanning/cleansing tool would be helpful.
Jeff
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/
