lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <394E7FDFA9B04564B5C4A0343593E270@celsius>
Date: Sat, 16 Aug 2014 15:30:57 +0200
From: "Stefan Kanthak" <stefan.kanthak@...go.de>
To: <bugtraq@...urityfocus.com>
Cc: <fulldisclosure@...lists.org>
Subject: Beginners error: Windows Live Mail 2011 runs rogue C:\Program.exe when opening associated URLs

Hi @ll,

the following command lines associated with the URL protocols of
Windows Live Mail 2011 (15.4.3538.513)

WLMail.Url.Mailto=C:\Program Files (x86)\Windows Live\Mail\wlmail.exe /mailurl:"%1"
WLMail.Url.news=C:\Program Files (x86)\Windows Live\Mail\wlmail.exe /newsurl:"%1"
WLMail.Url.nntp=C:\Program Files (x86)\Windows Live\Mail\wlmail.exe /newsurl:"%1"
WLMail.Url.snews=C:\Program Files (x86)\Windows Live\Mail\wlmail.exe /newsurl:"%1"

execute the rogue programs "C:\Program.exe", "C:\Program Files\Windows.exe"
(on x86) resp. "C:\Program Files.exe" or "C:\Program Files (x86)\Windows.exe"
(on x64) with the credentials of the user whenever the user opens one of the
associated URLs.


>From <http://msdn.microsoft.com/library/cc144175.aspx>
or <http://msdn.microsoft.com/library/cc144101.aspx>:

| Note: If any element of the command string contains or might contain
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| spaces, it must be enclosed in quotation marks. Otherwise, if the
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| element contains a space, it will not parse correctly. For instance,
| "My Program.exe" starts the application properly. If you use
| My Program.exe without quotation marks, then the system attempts to
| launch My with Program.exe as its first command line argument.


Since every user account created during Windows setup has administrative
rights every user owning such an account can create the rogue program(s),
resulting in a privilege escalation.

JFTR: no, the "user account control" is not a security boundary!

      From <http://support.microsoft.com/kb/2526083>:

| Same-desktop Elevation in UAC is not a security boundary and can be hijacked
| by unprivileged software that runs on the same desktop. Same-desktop
| Elevation should be considered a convenience feature, and from a security
| perspective, "Protected Administrator" should be considered the equivalent
| of "Administrator."


JFTR: if you or your customers, family etc. still use Windows Live Mail 2011,
      see <https://technet.microsoft.com/library/security/ms13-045> and upgrade
      to Windows Live Mail 2012 ASAP!


regards
Stefan Kanthak


PS: the associations for .eml and .nws DONT show this beginners error:

    WindowsLiveMail.Email.1="C:\Program Files (x86)\Windows Live\Mail\wlmail.exe" /eml:%1
    WindowsLiveMail.News.1="C:\Program Files (x86)\Windows Live\Mail\wlmail.exe" /nws:%1

    Unfortunately their argument %1 is not quoted, see above!

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ