Summary
Buffer overflow attempt.
Details
A very long user name, password, or file name often signals an intentional
effort to overflow a buffer on a server.
By constructing the data in a particular way, the intruder may be
able to execute his own code on the attacked system.
More about this general class of attacks, which is the root cause
of many attacks on the Internet.
A HELO argument of over 1119 characters will crash the server
A HELO argument of over 12,000 characters will crash the server.
A HELO argument of over 10,000 characters overflows the buffer.
There is a buffer overflow in the HELO command of the smtp gateway
which ships as part of the Trend Micro InterScan VirusWall 3.3 product.
