CVSNT 2.0.51d Privilege Escalation Vulnerability

[+] Credits: John Page aka hyp3rlinx


Vendor:
======================
www.march-hare.com
www.wincvs.org
cvsgui.sourceforge.net


Product:
==============
CVSNT v2.0.51d

Is part of "WinCvs" install zip archive.

The CVSNT Versioning System implements a version control system: it keeps
track of all changes in a set of files, typically the
implementation of a software project, and allows several (potentially
geographically separated) developers to collaborate.
It is compatible with and originally based on Concurrent Versions System
(CVS), which has become popular in the open-source world.


from "Install.txt" ...

Run wincvs_setup.exe to install WinCvs. It will also run CVSNT installer
after completion.

Run cvsnt_setup.exe to setup CVSNT only.



Vulnerability Type:
=====================
Privilege Escalation



CVE Reference:
==============
N/A



Vulnerability Details:
=====================

CVSNT installs a service with an unquoted service path running with SYSTEM
privileges, to exploit a local attacker must place
a malicious executable file named "Program.exe" in the path of the service.
After service restart or system reboot, it could
potentially allow an authorized local user to execute arbitrary code with
elevated privileges on the system.


Proof:
======

C:\Users\hyp3rlinx>sc qc CVSLock
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: CVSLock
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\Program Files (x86)\cvsnt\cvslock.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : CVSNT Locking Service
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

#  0day.today [2018-03-13]  #