Peter is a Network Admin. He is concerned that his network is vulnerable to a smurf attack. What should Peter do to prevent a smurf attack?Select the best answer.
Answer(s): E
Unicasts are one-to-one IP transmissions, by disabling this he would disable most network transmissions but still not prevent the smurf attack. Turning of multicast or fragmentation on the router has nothing to do with Peter’s concerns as a smurf attack uses broadcast, not multicast and has nothing to do with fragmentation. Anti-virus protection will not help prevent a smurf attack. A smurf attack is a broadcast from a spoofed source. If directed broadcasts are enabled on the destination all the computers at the destination will respond to the spoofed source, which is really the victim. Disabling directed broadcasts on a router can prevent the attack.
Bill successfully executed a buffer overflow against a Windows IIS web server. He has been able to spawn in interactive shell and plans to deface the main web page. He fist attempts to use the “Echo” command to simply overwrite index.html and remains unsuccessful. He then attempts to delete the page and achieves no progress. Finally, he tires to overwrite it with another page in which also he remains unsuccessful. What is the probable cause of Bill’s problem?
Answer(s): B
A honeypot has no interest in stopping an intruder from altering the “target” files. A buffer overflow is a way to gain access to the target computer. Once he has spawned a shell it is unlikely that it will not work as intended, but the user context that the shell is spawned in might stop him from altering the index.html file incase he doesn’t have sufficient rights.
Windows LAN Manager (LM) hashes are known to be weak. Which of the following are known weaknesses of LM? (Choose three)
Answer(s): A,B,D
The LM hash is computed as follows.1. The user’s password as an OEM string is converted to uppercase. 2. This password is either null-padded or truncated to 14 bytes. 3. The “fixed-length” password is split into two 7-byte halves. 4. These values are used to create two DES keys, one from each 7-byte half. 5. Each of these keys is used to DES-encrypt the constant ASCII string “KGS!@#$%”, resulting in two 8-byte ciphertext values. 6. These two ciphertext values are concatenated to form a 16-byte value, which is the LM hash. The hashes them self are sent in clear text over the network instead of sending the password in clear text.
How do you defend against ARP spoofing?
Answer(s): A,B,C
ARPWALL is a opensource tools will give early warning when arp attack occurs. This tool is still under construction.
All the web servers in the DMZ respond to ACK scan on port 80. Why is this happening ?
Answer(s): D
If they used a stateful inspection firewall this firewall would know if there has been a SYN-ACK before the ACK.
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