CVSNT 2.0.51d Privilege Escalation

`[+] Credits: John Page aka hyp3rlinx  
  
[+] Website: hyp3rlinx.altervista.org  
  
[+] Source:  
http://hyp3rlinx.altervista.org/advisories/CVSNT-PRIVILEGE-ESCALATION.txt  
  
[+] ISR: ApparitionSec  
  
  
  
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  
  
  
  
  
Exploitation Technique:  
=======================  
Local  
  
  
  
Severity Level:  
================  
Medium  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory,  
provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in  
vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the  
information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author  
prohibits any malicious use of security related information  
or exploits by the author or elsewhere.  
  
hyp3rlinx  
`