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>From the 'cover-your-basics' and from the 'they-still-exist-department'
Antivir insecure CreateProcess() usage - Privilege Esclation and autostart as free bonus ___________________________________________________________________ Reference : [TZO-2009-2]-Avira Antivir Priviledge escalation WWW : http://blog.zoller.lu/2009/01/tzo-2009-2-avira-antivir-priviledge.html Product : AV7/AV8 desktop products : - Avira AntiVir Premium - Avira Premium Security Suite - Avira AntiVir Professional Vendor : http://www.avira.de
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Calling an executable with a path has spaces in it and not using quotes will trigger windows to search for the executable in various areas.
Calling for instance -
c:\program files\avira\antivir PersonalEdition Classic\avwsc.exe, ...
will first look for
This is documented and intended behaviour as can be seen at : http://msdn.microsoft.com/en-us/library/ms682425.aspx
Quoting ms682425.aspx :
The lpApplicationName parameter can be NULL. In that case, the module name must be the first white space–delimited token in the lpCommandLine string. If you are using a long file name that contains a space, use quoted strings to indicate where the file name ends and the arguments begin; otherwise, the file name is ambiguous. For example, consider the string "c:\program files\sub dir\program name". This string can be interpreted in a number of ways. The system tries to interpret the possibilities in the following order:
c:\program.exe files\sub dir\program name, c:\program files\sub.exe dir\program name c:\program files\sub dir\program.exe name, c:\program files\sub dir\program name.exe
Pre-conditions for a CreateProcess() call to be insecure : - lpApplicationName contains a NULL - the path in lpCommandLine cotains white space - the path in lpCommandLine is not enclosed in quotation marks
IV. Disclosure Timeline
References :  http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038789.html  CreateProcess() - http://msdn.microsoft.com/en-us/library/ms682425.aspx  Book: Fuzzing - Brute force vulnerability discovery  Loadlibrary() - http://msdn.microsoft.com/en-us/library/ms684175(VS.85).aspx If the string does not specify a path, the function uses a standard search strategy to find the file.