=====[ Tempest Security Intelligence - ADV-23/2018 ]===

Total AV 4.1.7 ~ 4 .6.19 - Insecure Permissions
-------------------------------------------------------
Author:
- Filipe Xavier Oliveira: < filipe.xavier () tempest.com.br
<http://tempest.com.br/>

=====[ Table of Contents
]=====================================================

* Overview 
* Detailed description 
* Timeline of disclosure 
* Thanks & Acknowledgements 
* References

=====[ Overview
]==============================================================

* System affected : Total AV [1]
* Software Version : 4.1.7 ~ 4 .6.19. Other versions or models may also
be affected.
* Impact : A malware could overwrite originals files to do persistence
or elevate privileges, because the installation folder gives full access
to any user on the system.

=====[ Detailed description
]==================================================

A vulnerability allows local attackers to escalate privilege on TotalAV
because of weak "C:\Program Files\TotalAV" permissions. The specific
flaw exists within the access control that is set and modified during
the installation of the product. The product sets weak access control
restrictions. An attacker can leverage this vulnerability to execute
arbitrary code under the context of Administrator, the IUSR account, or
SYSTEM.

The TotalAV installation folder permissions:

C:\Program Files>icacls TotalAV

TotalAV BUILTIN\Users:(OI)(CI)(F)
Everyone:(OI)(CI)(F)
NT SERVICE\TrustedInstaller:(I)(F)
NT SERVICE\TrustedInstaller:(I)(CI)(IO)(F)
NT AUTHORITY\SYSTEM:(I)(F)
NT AUTHORITY\SYSTEM:(I)(OI)(CI)(IO)(F)
BUILTIN\Administrators:(I)(F)
BUILTIN\Administrators:(I)(OI)(CI)(IO)(F)
BUILTIN\Users:(I)(RX)
BUILTIN\Users:(I)(OI)(CI)(IO)(GR,GE)
CREATOR OWNER:(I)(OI)(CI)(IO)(F)

=====[ Timeline of disclosure
]===============================================

06/28/2018 - Vendor was informed of the vulnerability, but the contact
form on the site does not seem to work.

07/12/2018 - The vendor was contacted again but did not respond.

07/12/2018 - CVE assigned [2] 

07/12/2018 - Advisory publication date.

=====[ Thanks & Acknowledgements
]============================================

- Tempest Security Intelligence / Tempest's Pentest Team [3]

=====[ References
]===========================================================

[1] - https://www.totalav.com/
[2] - https://cve.mitre.org/cgi-bin/cvename.cgi?name=
<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5313>CVE-2018-7535

[3] http://www.tempest.com.br/

-- 
Filipe Oliveira
Tempest Security Intelligence