- A
Session hijacking via cross-site scripting (XSS)
Why wrong: Session hijacking via XSS requires an attacker to inject malicious script that steals the victim's session token. This scenario does not involve injecting script; it involves predicting the token without stealing it.
- B
Session replay attack
Why wrong: A session replay attack involves capturing a valid token and reusing it later to impersonate the same user. The vulnerability described allows the attacker to create a token for a different user, not replay a captured one.
- C
Session prediction
The session token is generated using the username and a timestamp with low granularity, making it possible for an attacker who knows the algorithm to calculate valid tokens for any user. This is a classic session prediction vulnerability.
- D
Session fixation
Why wrong: Session fixation occurs when an attacker forces a victim to use a session token that the attacker knows. Here, the attacker is able to compute a token for the victim without any interaction, so it is prediction, not fixation.
Quick Answer
The answer is session prediction, because the web application generates session tokens using a predictable algorithm—MD5 of the username combined with a timestamp rounded to the nearest hour. This lack of entropy means that once an attacker obtains her own valid token, she can simply substitute another user’s username into the same hash calculation to forge that user’s token, effectively predicting session identifiers for any account active within that hour window. On the Security+ SY0-701 exam, this scenario tests your understanding of secure session management and the importance of using cryptographically random, unpredictable session tokens rather than deterministic values like hashed user data or timestamps. A common trap is confusing session prediction with session hijacking or fixation; remember that prediction focuses on forging tokens before they are issued, not stealing or fixing an existing one. Memory tip: “Predictable inputs lead to predictable tokens—if you can guess it, it’s session prediction.”
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security analyst is reviewing the session management implementation of a web application. The application generates session tokens by computing the MD5 hash of the concatenation of the username and the current server timestamp rounded to the nearest hour. An attacker has obtained a valid session token for her own account and discovers that she can forge tokens for other users by simply substituting the username in the hash calculation with a known target username. Which type of attack is the web application most vulnerable to?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Session prediction
The session token is generated using MD5(username + timestamp rounded to the nearest hour). Since the attacker knows her own token and can compute the hash for any username with the same timestamp, she can predict tokens for other users. This is a classic session prediction vulnerability, as the token generation lacks sufficient entropy and relies on predictable inputs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Session hijacking via cross-site scripting (XSS)
Why it's wrong here
Session hijacking via XSS requires an attacker to inject malicious script that steals the victim's session token. This scenario does not involve injecting script; it involves predicting the token without stealing it.
- ✗
Session replay attack
Why it's wrong here
A session replay attack involves capturing a valid token and reusing it later to impersonate the same user. The vulnerability described allows the attacker to create a token for a different user, not replay a captured one.
- ✓
Session prediction
Why this is correct
The session token is generated using the username and a timestamp with low granularity, making it possible for an attacker who knows the algorithm to calculate valid tokens for any user. This is a classic session prediction vulnerability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Session fixation
Why it's wrong here
Session fixation occurs when an attacker forces a victim to use a session token that the attacker knows. Here, the attacker is able to compute a token for the victim without any interaction, so it is prediction, not fixation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing session prediction with session hijacking via XSS or session replay, but the key clue is that the attacker can compute the token herself by substituting the username, which directly indicates a predictable token generation scheme.
Trap categories for this question
Scenario analysis trap
Session hijacking via XSS requires an attacker to inject malicious script that steals the victim's session token. This scenario does not involve injecting script; it involves predicting the token without stealing it.
Detailed technical explanation
How to think about this question
MD5 is a 128-bit cryptographic hash function that is no longer considered secure for session management due to its speed and collision vulnerabilities. Rounding the timestamp to the nearest hour reduces the keyspace to at most 24 possible values per day, making brute-force or prediction trivial. In practice, secure session tokens should use a cryptographically random number generator (CSPRNG) with at least 128 bits of entropy, as recommended by RFC 6269 and OWASP guidelines.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Session prediction — The session token is generated using MD5(username + timestamp rounded to the nearest hour). Since the attacker knows her own token and can compute the hash for any username with the same timestamp, she can predict tokens for other users. This is a classic session prediction vulnerability, as the token generation lacks sufficient entropy and relies on predictable inputs.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This SY0-701 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SY0-701 exam.
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