- A
SQL injection, because the attacker likely altered a database query.
Why wrong: SQL injection targets database queries, but the scenario starts with serialized objects and leads to unexpected code behavior, which points away from a query-based attack.
- B
Cross-site scripting, because the attacker could have injected script into the portal.
Why wrong: Cross-site scripting affects a user’s browser and session context. It does not normally explain server-side code execution, LDAP calls, and local account creation.
- C
Insecure deserialization, because a crafted object triggered unexpected server-side actions.
Insecure deserialization occurs when an application accepts untrusted serialized data and rebuilds it unsafely. That can allow an attacker to trigger code paths, remote lookups, or even command execution, which matches the LDAP activity and account creation.
- D
CSRF, because the attacker may have forced an administrator to submit a form.
Why wrong: CSRF depends on a victim browser sending an authenticated request. The question instead describes malicious serialized input that alters server behavior directly, which is a different class of bug.
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 Java-based internal portal accepts a serialized object during profile import. After a recent test upload, the server made outbound LDAP calls and created a new local account. What attack pattern best explains this behavior?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Insecure deserialization, because a crafted object triggered unexpected server-side actions.
Option C is correct because the scenario describes a Java application accepting a serialized object during profile import, which is a classic vector for insecure deserialization attacks. By crafting a malicious serialized object, an attacker can trigger arbitrary code execution on the server, leading to outbound LDAP calls and local account creation—actions that are not part of normal profile import logic. This attack exploits the trust placed in serialized data without proper validation or integrity checks.
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.
- ✗
SQL injection, because the attacker likely altered a database query.
Why it's wrong here
SQL injection targets database queries, but the scenario starts with serialized objects and leads to unexpected code behavior, which points away from a query-based attack.
- ✗
Cross-site scripting, because the attacker could have injected script into the portal.
Why it's wrong here
Cross-site scripting affects a user’s browser and session context. It does not normally explain server-side code execution, LDAP calls, and local account creation.
- ✓
Insecure deserialization, because a crafted object triggered unexpected server-side actions.
Why this is correct
Insecure deserialization occurs when an application accepts untrusted serialized data and rebuilds it unsafely. That can allow an attacker to trigger code paths, remote lookups, or even command execution, which matches the LDAP activity and account creation.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
CSRF, because the attacker may have forced an administrator to submit a form.
Why it's wrong here
CSRF depends on a victim browser sending an authenticated request. The question instead describes malicious serialized input that alters server behavior directly, which is a different class of bug.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse insecure deserialization with other injection attacks (SQLi or XSS) because all involve untrusted input, but only deserialization directly allows server-side object reconstruction and arbitrary method invocation without proper validation.
Trap categories for this question
Scenario analysis trap
SQL injection targets database queries, but the scenario starts with serialized objects and leads to unexpected code behavior, which points away from a query-based attack.
Detailed technical explanation
How to think about this question
In Java, insecure deserialization exploits the readObject() method, which can execute arbitrary code if the serialized object contains references to gadget chains (e.g., Commons Collections or Spring classes). Real-world attacks like the 2015 Apache Commons Collections vulnerability (CVE-2015-4852) allowed remote code execution via crafted serialized objects, often leading to lateral movement or privilege escalation. The outbound LDAP calls suggest the attacker used a deserialization payload to invoke JNDI injection (e.g., via Log4Shell-like techniques), enabling remote class loading and account creation.
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: Insecure deserialization, because a crafted object triggered unexpected server-side actions. — Option C is correct because the scenario describes a Java application accepting a serialized object during profile import, which is a classic vector for insecure deserialization attacks. By crafting a malicious serialized object, an attacker can trigger arbitrary code execution on the server, leading to outbound LDAP calls and local account creation—actions that are not part of normal profile import logic. This attack exploits the trust placed in serialized data without proper validation or integrity checks.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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