Question 489 of 513
1Z0-829 Java I/O API and Securing Applications Practice Question
Which THREE are recommended practices to prevent privilege escalation when using doPrivileged in a security-sensitive Java application?
⚠ Common exam trap
Many candidates confuse the mechanism (SecurityManager) with a preventive practice, or think that SubjectDomainCombiner is a security control when it actually aggregates permissions and can inadvertently widen the privilege scope.
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
✓
Restrict the codebase URLs in policy files to only trusted code locations.
Restricting codebase URLs in policy files to only trusted code locations limits the sources from which privileged code can be loaded. This prevents an attacker from injecting malicious code from an untrusted URL that could otherwise be granted elevated permissions via doPrivileged. By narrowing the codebase, you reduce the attack surface for privilege escalation attacks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Restrict the codebase URLs in policy files to only trusted code locations.
Why this is correct
Limiting which code can be granted privileges reduces attack surface.
- ✗
Use SubjectDomainCombiner to merge multiple protection domains.
Why it's wrong here
SubjectDomainCombiner is for combining subjects, not directly for preventing privilege escalation.
- ✗
Always use a SecurityManager to enforce the policy.
Why it's wrong here
SecurityManager is a framework but does not by itself prevent escalation; proper policy configuration is needed.
- ✓
Sign JARs and verify signatures to ensure code integrity.
Why this is correct
Code signing prevents tampering and ensures trusted origin.
- ✓
Use AccessController.checkPermission to explicitly check permissions before privileged operations.
Why this is correct
Explicit permission checks reduce the risk of unintended privileged actions.
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Last reviewed: Jun 25, 2026
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