Server-Side Request Forgery (SSRF) via Cloud Metadata
A file-conversion API accepts a URL to generate a preview image. An attacker submits a URL for the cloud metadata service at 169.254.169.254 and receives instance credentials in the preview output. What attack is this?
Quick Answer
The correct answer is Server-Side Request Forgery (SSRF). This attack succeeds because the file-conversion API blindly fetches a user-supplied URL, and when that URL points to the cloud metadata service at 169.254.169.254, the server makes an internal HTTP request to a resource that is inaccessible from the internet. The API then returns the sensitive metadata—including instance credentials—in the generated preview image, exploiting the server’s implicit trust to access internal systems. On the Security+ SY0-701 exam, this scenario tests your ability to recognize SSRF when an internal IP or cloud metadata endpoint is used to exfiltrate data; a common trap is confusing it with a direct injection attack. Remember the key indicator: the server is tricked into making the request on the attacker’s behalf. Memory tip: “SSRF = Server Sends Request For you—the attacker controls the destination, not the data.”
⚠ Common exam trap
Many exam-takers confuse SSRF with CSRF because both involve 'request forgery,' but SSRF targets server-side requests to internal resources, while CSRF targets user-side requests to perform unauthorized actions.
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
✓
Server-side request forgery
The attack is Server-Side Request Forgery (SSRF) because the attacker manipulates the file-conversion API into making an outbound HTTP request to an internal IP address (169.254.169.254, the cloud metadata service). The API then returns the metadata (including instance credentials) in the generated preview image, exploiting the server's trust to access internal resources that are not directly accessible from the internet.
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
Why it's wrong here
SQL injection manipulates database queries through unsanitised input; this API instead fetches a URL server-side, so no SQL parser or database is involved in retrieving the metadata credentials. It is tempting because both are injection flaws, but the exploited mechanism is outbound HTTP request forgery, not query manipulation.
- ✓
Server-side request forgery
Why this is correct
Server-side request forgery occurs because the API fetches an attacker-supplied URL server-side, reaching the link-local metadata endpoint at 169.254.169.254 that the attacker cannot access directly. This satisfies the stem's constraint: the preview service returns instance credentials, confirming the server, not the client, made the request.
- ✗
Cross-site request forgery
Why it's wrong here
CSRF exploits a victim's ambient session cookies to submit forged authenticated requests; here the attacker supplies a URL directly and reads returned credentials, with no victim browser or session involved. It is tempting because the API accepts user-supplied input, but the mechanism is server-side request forgery against the metadata endpoint.
- ✗
Command injection
Why it's wrong here
Command injection appends shell metacharacters so the server executes attacker-supplied OS commands; here the server performs an HTTP fetch of the supplied URL, and no shell is invoked. It is tempting because both abuse unsanitised input, but the concrete mechanism is server-side request forgery reaching the metadata service.
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Same concept, more angles
1 more way this is tested on SY0-701
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A cloud-hosted image-processing API accepts a URL parameter so it can download a picture and generate a thumbnail. Logs show a user submitting `http://169.254.169.254/latest/meta-data/` and receiving instance credentials in the response. Which attack is being used?
medium- A.Cross-site scripting (XSS)
- ✓ B.Server-side request forgery (SSRF)
- C.Cross-site request forgery (CSRF)
- D.SQL injection
Why B: The attack is Server-Side Request Forgery (SSRF) because the cloud-hosted API is tricked into making a request to the internal metadata service at the link-local address 169.254.169.254. This endpoint is only accessible from within the cloud provider's network and exposes instance credentials, which the attacker then receives in the response. SSRF exploits the server's ability to make outbound requests to internal or restricted resources.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.