Oracle extproc directory traversal (#NISR23122004B)

From: NGSSoftware Insight Security Research (nisr_at_NEXTGENSS.COM)
Date: 12/23/04

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    Date:         Thu, 23 Dec 2004 16:32:57 -0000
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    NGSSoftware Insight Security Research Advisory

    Name: Oracle 10g/9i extproc directory traversal
    Systems Affected: Oracle 10g/9i on all operating systems
    Severity: Medium Risk
    Vendor URL: http://www.oracle.com/
    Author: David Litchfield [ davidl at ngssoftware.com ]
    Relates to: http://www.nextgenss.com/advisories/oracle-01.txt
    Date of Public Advisory: 23rd December 2004
    Advisory number: #NISR23122004B
    Advisory URL: http://www.ngssoftware.com/advisories/oracle23122004B.txt

    Description
    ***********
    The Oracle database server supports PL/SQL, a programming language. PL/SQL
    can execute external procedures via extproc. Over the past few years there
    has been a number of vulnerabilities in this area:

    http://www.nextgenss.com/advisories/oraplsextproc.txt
    http://www.nextgenss.com/advisories/ora-extproc.txt

    Extproc has been found to suffer from a directory traversal problem that
    allows attackers access to arbitray libraries.

    Details
    *******
    extproc verifies that the library to be loaded is in the $ORACLE_HOME\bin
    directory. This is to ensure that libraries outside of this directory cannot
    be loaded. However, there exists a directory traversal issue whereby an
    attacker can break outside of this constraint. This can allow attackers to
    access libraries such as libc and msvcrt.dll. By calling the system()
    function attackers can run arbitrary OS commands.

    Fix Information
    ***************
    A patch (#68) was released for this problem by Oracle. See
    http://metalink.oracle.com/ for more details. NGSSQuirreL for Oracle
    (http://www.nextgenss.com/squirrelora.htm), can be used to assess whether
    your Oracle servers are vulnerable to this.

    About NGSSoftware
    *****************
    NGSSoftware design, research and develop intelligent, advanced application
    security assessment scanners. Based in the United Kingdom, NGSSoftware have
    offices in the South of London and the East Coast of Scotland. NGSSoftware's
    sister company NGSConsulting, offers best of breed security consulting
    services, specialising in application, host and network security
    assessments.

    http://www.ngssoftware.com/

    Telephone +44 208 401 0070
    Fax +44 208 401 0076

    enquiries@ngssoftware.com 

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