[VulnWatch] Oracle TNS Listener DoS (#NISR2122004F)

From: NGSSoftware Insight Security Research (nisr_at_nextgenss.com)
Date: 12/23/04

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    To: <bugtraq@securityfocus.com>, <ntbugtraq@listserv.ntbugtraq.com>, <vulnwatch@vulnwatch.org>
    Date: Thu, 23 Dec 2004 16:36:09 -0000
    
    

    NGSSoftware Insight Security Research Advisory

    Name: Oracle 10g TNS Listener DoS
    Systems Affected: Oracle 10g on all operating systems
    Severity: High risk on high availability systems else low
    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: #NISR2122004F
    Advisory URL: http://www.ngssoftware.com/advisories/oracle23122004F.txt

    Description
    ***********
    The 10g Oracle TNS Listener is vulnerable to a denial of service
    vulnerability.

    Details
    *******
    This occurs by sending the Listener a malformed service_register_NSGR
    request. Byte 182 of the request is used as an offset to a pointer; in a
    normal request this byte's value is 5 but by setting it to say 0xCC an
    attacker can get the Listener to access (read) an arbitrary value which
    causes the Listener to access violate/core dump.

    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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