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From: Oracle Security Alerts (secalert_usORACLE.COM)
Date: Mon Feb 12 2001 - 16:13:47 CST

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    Solution for Potential Vulnerability in Granting FilePermission to
    Oracle Java Virtual Machine

    Versions Affected
    Oracle8i Release 3 (8.1.7)
    Oracle Application Server 9iAS Release

    Platforms Affected

    Description of the Problem
    A potential vulnerability in Oracle JVM has been discovered. The Oracle
    Servlet Engine in the Oracle JVM security policy recommends granting
    file permissions in a very controlled manner. When this policy is
    disregarded and FilePermission is granted to <<ALL FILES>> within a web
    domain, there exists a potential vulnerability of viewing directories
    and static files outside the web root with the help of .jsp and .sqljsp

    call dbms_java.grant_permission('SCOTT', 'SYS:java.io.FilePermission',
    '<<ALL FILES>>','read');

    Thus, it may also be possible to execute .jsp files outside the web

    Likelihood of Occurrence
    In a Netscape browser, a URL containing "the current hierarchy level"
    (".") and/or "the level above this hierarchy level" ("..")

    To avoid this vulnerability, grant permission to the explicit document
    root file path only.

    call dbms_java.grant_permission('SCOTT', 'SYS:java.io.FilePermission',
    '(actually directory path)','read');