NGSSoftware Insight Security Research Advisory
Name: Oracle RDBMS Data packet DoS Systems Affected: Oracle 22.214.171.124, 10g Release 2 and 1, Oracle 9 Severity: High Vendor URL: http://www.oracle.com/ Author: David Litchfield [ email@example.com ] Reported: 23rd June 2006 Date of Public Advisory: 17th October 2007 Advisory number: #NISR17102007D
The Oracle RDBMS on receiving an invalid TNS data packet will use 100% of the CPU's time introducing a Denial of Service condition.
Once a client connects to the database process and performs protocol negoation (TNS packet type 1) and data type represenations (packet type 2) it may then send packets of type 6 - Data packets. If the server gets a packet with the 2nd bit of the Data flags is set then the server runs at 100% CPU:
"\x00\x1D" // Packet Size "\x00\x00" // Packet Checksum "\x06" // Packet Type [DATA] "\x00" // Flags "\x00\x00" // Header Checksum "\x00\x02" // Data flags "\x03\x3B" // TTI Version function .. ..
The snippet of a packet above sets the Data flags to 0x0002 on a version request. This DoS condition can be triggered prior to authentication. This can be exploited by an unauthenticated attacker.
Oracle was alerted to this flaw on the 23rd of June 2006. A patch has now been made available:
NGSSQuirreL for Oracle, an advanced vulnerability assessment scanner designed specifically for Oracle, can be used to accurately determine whether your servers is vulnerable to this flaw. More information about NGSSQuirreL for Oracle can be found here:
NGSSoftware develops vulnerability assessment and compliancy tools for database servers including Oracle, Microsoft SQL Server, DB2, Sybase and Informix. Headquartered in the United Kingdom NGS has offices in London, St. Andrews (UK), Brisbane, and Perth (Australia) and seattle in the United States; NGSConsulting provide services to some of the largest and most demanding organizations around the globe. http://www.ngssoftware.com/ Telephone +44 208 401 0070 Fax +44 208 401 0076 firstname.lastname@example.org
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