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Oracle TNS Listener DoS and Remote Memory Inspection
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SUMMARY
The TNS Listener can be crashed by an attacker causing a Denial of
Service; alternatively the attacker can use the same flaw to expose memory
contents remotely. This may reveal sensitive information.
DETAILS
There is a bug in GIOP service that can allow an attacker to crash the TNS
Listener and/or dump memory. A DWORD in the connect GIOP packet is trusted
as the size of the data in the packet.
By setting this to a large value (e.g. 0 1FFFF) causes the listener to
allocate this much memory then attempt to copy this much data to it -
which eventually leads to a read access violation because the source data
is less than this number and the process lands in uninitialized memory.
If the attacker uses a smaller number, e.g. 0xFFFF they can dump this many
bytes from memory.
This may reveal sensitive information such as the TNS Listener password.
Vendor Status:
Oracle was alerted to this flaw on the 22nd 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-tns-listener/>
http://www.ngssoftware.com/advisories/high-risk-vulnerability-in-oracle-tns-listener/
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