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Wampserver 3.0.6 - Insecure File Permissions Privilege Escalation Vulnerability
[=====================================================
# Vendor Homepage: http://www.wampserver.com/
# Date: 10 Dec 2016
# Version : Wampserver 3.0.6 32 bit x86
# Tested on: Windows 7 Ultimate SP1 (EN)
# Author: Heliand Dema
# Contact: heliand@cyber.al
=====================================================
Wampserver installs two services called 'wampapache' and 'wampmysqld'
with weak file permission running with SYSTEM privileges.
This could potentially allow an authorized but non-privileged local user
to execute arbitrary code with elevated privileges on the system.
C:\>sc qc wampapache
[SC] QueryServiceConfig SUCCESS
SERVICE_NAME: wampapache
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 3 DEMAND_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME :
"c:\wamp\bin\apache\apache2.4.23\bin\httpd.exe" -k runservice
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : wampapache
DEPENDENCIES : Tcpip
: Afd
SERVICE_START_NAME : LocalSystem
PS C:\> icacls c:\wamp\bin\apache\apache2.4.23\bin\httpd.exe
c:\wamp\bin\apache\apache2.4.23\bin\httpd.exe
BUILTIN\Administrators:(I)(F) <--- Full Acces
NT AUTHORITY\SYSTEM:(I)(F)
BUILTIN\Users:(I)(RX)
NT AUTHORITY\Authenticated
Users:(I)(M) <--- Modify
C:\Windows\system32>sc qc wampmysqld
[SC] QueryServiceConfig SUCCESS
SERVICE_NAME: wampmysqld
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 3 DEMAND_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME :
c:\wamp\bin\mysql\mysql5.7.14\bin\mysqld.exe wampmysqld
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : wampmysqld
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem
PS C:\> icacls c:\wamp\bin\mysql\mysql5.7.14\bin\mysqld.exe
c:\wamp\bin\mysql\mysql5.7.14\bin\mysqld.exe
BUILTIN\Administrators:(I)(F) <--- Full Acces
NT AUTHORITY\SYSTEM:(I)(F)
BUILTIN\Users:(I)(RX)
NT AUTHORITY\Authenticated
Users:(I)(M) <--- Modify
Notice the line: NT AUTHORITY\Authenticated Users:(I)(M) which lists the
permissions for authenticated however unprivileged users. The (M) stands
for Modify, which grants us, as an unprivileged user, the ability to
read, write and delete files and subfolders within this folder.
====Proof-of-Concept====
To properly exploit this vulnerability, the local attacker must insert
an executable file called mysqld.exe or httpd.exe and replace the
original files. Next time service starts the malicious file will get
executed as SYSTEM.
# 0day.today [2024-11-16] #