[NEWS] Oracle RDBMS Data packet DoS

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Oracle RDBMS Data packet DoS
------------------------------------------------------------------------

SUMMARY

The Oracle RDBMS upon receiving an invalid TNS data packet will use 100%
of the CPU's time introducing a Denial of Service condition.

DETAILS

Vulnerable Systems:
* Oracle version 8.1.7.4
* Oracle version 9
* Oracle version 10g Release 2 and 1

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 0 0002 on a version
request. This DoS condition can be triggered prior to authentication. This
can be exploited by an unauthenticated attacker.

Vendor Status:
Oracle was alerted to this flaw on the 23rd of June 2006. A patch has now
been made available:

<http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpuoct2007.html> http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpuoct2007.html

ADDITIONAL INFORMATION

The information has been provided by <mailto:davidl@ngssoftware.com>
David Litchfield.
The original article can be found at:

<http://www.ngssoftware.com/advisories/high-risk-vulnerability-in-oracle-rdbms/> http://www.ngssoftware.com/advisories/high-risk-vulnerability-in-oracle-rdbms/

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