1_3_5 Section 1 – Attacks, Threats, and Vulnerabilities - 1.3 – Application Attacks - Replay Attacks

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Questions and Answers

What protocol should be used to prevent attackers from gathering session IDs off network flows?

  • POP3
  • SSL (correct)
  • HTTP
  • FTP

How might an attacker gather session information directly from the network?

  • Using Wireshark or Kismet (correct)
  • Sending phishing emails
  • Accessing the server physically
  • Analyzing server logs

What action could an attacker with access to a vulnerable server take to obtain session IDs?

  • Encrypt the server data
  • Change network settings
  • Redirect session IDs to themselves (correct)
  • Update antivirus software

How can replay and session attacks be prevented?

<p>Ensure all communication is encrypted (A)</p>
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What additional overhead does turning on encryption on a web server introduce?

<p>Increased processing requirements (C)</p>
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What can users do if a service doesn't support HTTPS for communication?

<p>Use an encrypted tunnel (A)</p>
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What is a common piece of information that a crafty hacker might extract from network flows?

<p>Session ID (A)</p>
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How might a hacker gather network information if they have physical access to the network?

<p>Install a network tap (A)</p>
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What is a method a hacker might use if they lack physical access to the network?

<p>ARP poisoning (D)</p>
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What type of attack involves capturing and replaying information across the network as if it originated from the victim?

<p>Replay attack (C)</p>
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What can hackers do with gathered session IDs or credentials from network traffic?

<p>Use them across the network later on (D)</p>
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Is physical access to the network always required for a replay attack to be successful?

<p>No, it can be done without being physically present on the network path (B)</p>
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What type of attack involves an attacker gaining access to the hash value associated with a password?

<p>Replay attack (A)</p>
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How can developers prevent a 'pass the hash' attack?

<p>Encrypting communication channels like SSL or TLS (D)</p>
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What technique involves adding a unique identifier to a hash to prevent a replay attack?

<p>Hash salting (B)</p>
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Why is it important for developers to ensure that cookies are secure?

<p>To prevent replay attacks (D)</p>
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How does an attacker gain access to a session ID in a session hijacking attack?

<p>By sniffing network traffic (A)</p>
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What makes SSL and TLS effective in preventing certain types of attacks?

<p>They encrypt communication channels (B)</p>
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Which of the following is NOT a reason why an attacker might target browser cookies?

<p>Accessing browser history (C)</p>
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What is the main risk of an attacker successfully performing a 'pass the hash' attack?

<p>Unauthorized access to user accounts (A)</p>
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How can developers make session IDs more secure against hijacking?

<p>'Rotating' them frequently (D)</p>
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'Pass the hash' attacks are mitigated by:

<p>'Salting' the hash values (C)</p>
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What does a crafty hacker aim to gather from network flows for an advantage during an attack?

<p>Session IDs (B)</p>
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How might an attacker gather network information if they lack physical access to the network?

<p>Injecting malicious code onto the victim's computer (A)</p>
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What type of attack involves capturing information across the network and replaying it to seem as if it originated from the victim?

<p>Replay attack (A)</p>
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What method might an attacker use to redirect network information logically?

<p>ARP poisoning (C)</p>
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In a replay attack, what can be captured by the attacker and later used across the network?

<p>Session IDs or credentials (A)</p>
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What can an attacker do if they capture information that can be replayed across the network?

<p>Conduct a replay attack (C)</p>
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How can replay and session attacks be prevented?

<p>Enabling encryption on all network traffic (C)</p>
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What action could an attacker with access to a vulnerable server take to obtain session IDs?

<p>Use a third-party utility to modify server headers (C)</p>
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What technique could prevent attackers from capturing session IDs from network flows?

<p>Implementing encrypted communication (B)</p>
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Why is it important for websites to operate over HTTPS or TLS?

<p>To protect data during transmission (A)</p>
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If a service does not support HTTPS, what alternative could be used to secure part of the communication flow?

<p>Creating an encrypted tunnel (C)</p>
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What could an attacker do in real time to modify headers being sent to a server?

<p>Employ a third-party utility for header modification (B)</p>
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How can developers prevent a 'pass the hash' attack as described in the text?

<p>Using strong encryption for communication between client and server (D)</p>
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What technique could developers use to make session IDs more secure against hijacking?

<p>Encrypting the session ID during transmission (B)</p>
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Why is salting the hash with a session ID helpful in preventing replay attacks?

<p>It creates unique hashed values even if the original data is the same (A)</p>
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What is a key benefit of using SSL or TLS for communication between client and server?

<p>Securing data transmission against unauthorized access (C)</p>
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How does an attacker potentially gain access to a user's account on a server in a 'pass the hash' attack?

<p>By replaying the captured password hash to the server (C)</p>
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What makes cookies stored in web browsers vulnerable to replay attacks as mentioned in the text?

<p>They may include sensitive session information (B)</p>
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Why are session IDs important in communication between a client and a service as outlined in the text?

<p>To avoid using usernames and passwords for every request (C)</p>
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'Pass the hash' attacks involve replaying what type of information back to the server?

<p>Hash value associated with a password (A)</p>
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What role do cookies play in facilitating session hijacking attacks as discussed in the text?

<p>Storing sensitive information including session IDs (A)</p>
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How does salting the hash with a session ID protect against replay attacks, according to the information provided?

<p>By making each password hash unique even for identical passwords (A)</p>
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