[Full-Disclosure] iDEFENSE Security Advisory 09.29.04 - Macromedia JRun 4 mod_jrun Apache Module Buffer Overflow Vulnerability

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Date: 09/30/04

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Date: Thu, 30 Sep 2004 10:14:24 -0400

    Macromedia JRun 4 mod_jrun Apache Module Buffer Overflow Vulnerability

    iDEFENSE Security Advisory 09.29.04
    www.idefense.com/application/poi/display?id=145&type=vulnerabilities
    September 29, 2004

    I. BACKGROUND

    Macromedia JRun 4 is a full Java 2 Enterprise Edition (J2EE) compatible
    application server.

    Further details are available at:

       http://www.macromedia.com/software/jrun/

    II. DESCRIPTION

    Remote exploitation of a buffer overflow vulnerability in Macromedia's
    JRun 4 mod_jrun Apache module could allow execution of arbitrary code.

    The problem specifically exists in the WriteToLog function of mod_jrun
    and mod_jrun20, where a fixed size buffer is allocated on the stack. No
    bounds checking is performed on the input. When the Verbose logging
    option is set, this function may be called with user-supplied data. If
    this data is longer than the space which has been allocated, a buffer
    overflow may occur. Specially formed input may allow execution of
    arbitrary commands.

    III. ANALYSIS

    Successful exploitation allows execution of arbitrary code with the
    permissions of the user of the httpd process, typically 'nobody' or
    'apache'.

    As the Verbose option is not set by default, most installs will not be
    vulnerable. An overly long Content-Type field, among other header
    fields, can be used to trigger this buffer overflow.

    IV. DETECTION

    iDEFENSE has confirmed that JRun 4.0 SP1a is vulnerable on Apache httpd
    1.3.x and 2.0.x platforms. It is suspected that all versions of mod_jrun
    are currently affected.

    V. WORKAROUNDS

    Setting the Verbose option to "false" in the httpd.conf will prevent
    this vulnerability from being exploitable. After editing the httpd.conf,
    restart the httpd. This will reduce the amount of data logged by the
    server, but will prevent exploitation of this vulnerability.

    VI. VENDOR RESPONSE

    MPSB04-08 - Cumulative Security Patch available for JRun server
    http://www.macromedia.com/devnet/security/security_zone/mpsb04-08.html

    VII. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    name CAN-2004-0646 to this issue. This is a candidate for inclusion in
    the CVE list (http://cve.mitre.org), which standardizes names for
    security problems.

    VIII. DISCLOSURE TIMELINE

    06/18/04 iDEFENSE Clients notified
    06/18/04 Initial vendor notification
    06/18/04 Initial vendor response
    09/29/04 Public disclosure

    IX. CREDIT

    The discoverer wishes to remain anonymous.

    Get paid for vulnerability research
    http://www.idefense.com/poi/teams/vcp.jsp

    X. LEGAL NOTICES

    Copyright (c) 2004 iDEFENSE, Inc.

    Permission is granted for the redistribution of this alert
    electronically. It may not be edited in any way without the express
    written consent of iDEFENSE. If you wish to reprint the whole or any
    part of this alert in any other medium other than electronically, please
    email customerservice@idefense.com for permission.

    Disclaimer: The information in the advisory is believed to be accurate
    at the time of publishing based on currently available information. Use
    of the information constitutes acceptance for use in an AS IS condition.
    There are no warranties with regard to this information. Neither the
    author nor the publisher accepts any liability for any direct, indirect,
    or consequential loss or damage arising from use of, or reliance on,
    this information.

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