Re: `Microsoft VM for Java' allows reading local files using

From: Ari Gordon-Schlosberg (regsat_private)
Date: Tue Feb 01 2000 - 15:50:55 PST

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    ["TAKAGI, Hiromitsu" <takagiat_private>]
    > Microsoft JVM allows reading local files using getSystemResourceAsStream.
    > For a detailed description, please see the following article.
    >
    
    Verified with build 5.00.2314.1003 on Win98.  Creepy.  According to the
    article above, IE 5 allows files under C:\Windows\Desktop to read, while IE
    4 gives access to C:\ itself.  Seems to me that there must be an a bug in
    either java.lang.SecurityManager.checkRead(String,Object) or
    java.lang.ClassLoader.getResourceAsStream(String).  If it's the former,
    this bug should be further exploitable to pretty much any file.  Therefore,
    most likely is that java.lang.ClassLoader.getResourceAsStream(String) is
    either a) not calling java.lang.SecurityManager.checkRead(String,Object) at
    all or b) passing it an incorrect context.
    
    --
    Ari							there is no spoon
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