fix unresolved interactsh-url variable with fuzzing

[RamanaReddy0M]

Proposed changes

• closes unresolved variables found: interactsh-url issue - Fuzzing Template (Payloads) #5181

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[ehsandeep]

@RamanaReddy0M this works for first example, not for second one.

id: variables-example

info:
  name: Variables Example
  author: pdteam
  severity: info

variables:
  test: "{{interactsh-url}}"

http:
  - pre-condition:
      - type: dsl
        dsl:
          - 'method == "GET"' 

    fuzzing:
      - part: query
        mode: multiple
        fuzz:
          - "{{url_encode(test)}}"
          - "{{base64(test)}}"

$ echo https://example.com/test?a=b | ./nuclei -t test.yaml -debug-req -v -dast

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v3.2.8

		projectdiscovery.io

[VER] Started metrics server at localhost:9092
[INF] Current nuclei version: v3.2.8 (outdated)
[INF] Current nuclei-templates version: v9.9.1 (latest)
[WRN] Scan results upload to cloud is disabled.
[INF] New templates added in latest release: 75
[INF] Templates loaded for current scan: 1
[WRN] Loading 1 unsigned templates for scan. Use with caution.
[INF] Targets loaded for current scan: 1
[INF] Using Interactsh Server: oast.me
[INF] [variables-example] Dumped HTTP request for https://example.com/test?a=cqag4tcbajf8h6sspge0u5rs19dzrtw5p.oast.me

GET /test?a=cqag4tcbajf8h6sspge0u5rs19dzrtw5p.oast.me HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
Accept-Encoding: gzip

[VER] [variables-example] Sent HTTP request to https://example.com/test?a=cqag4tcbajf8h6sspge0u5rs19dzrtw5p.oast.me
[INF] [variables-example] Dumped HTTP request for https://example.com/test?a=e3tpbnRlcmFjdHNoLXVybH19

GET /test?a=e3tpbnRlcmFjdHNoLXVybH19 HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
Accept-Encoding: gzip

[VER] [variables-example] Sent HTTP request to https://example.com/test?a=e3tpbnRlcmFjdHNoLXVybH19
[INF] No results found. Better luck next time!

Notice e3tpbnRlcmFjdHNoLXVybH19 is {{interactsh-url}} replaced as it is.

[RamanaReddy0M]

✗ echo 'https://example.com/test?a=b' | go run . -t test.yaml -v -dast

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v3.3.0

                projectdiscovery.io

[VER] Started metrics server at localhost:9092
[INF] Current nuclei version: v3.3.0 (latest)
[INF] Current nuclei-templates version: v9.9.1 (latest)
[WRN] Scan results upload to cloud is disabled.
[INF] New templates added in latest release: 75
[INF] Templates loaded for current scan: 1
[WRN] Loading 1 unsigned templates for scan. Use with caution.
[INF] Targets loaded for current scan: 1
[INF] Using Interactsh Server: oast.fun
[VER] [variables-example] Sent HTTP request to https://example.com/test?a=cqgb9a7d5lbjdmrniu0gy7cispjegq7bj.oast.fun
[VER] [variables-example] Sent HTTP request to https://example.com/test?a=Y3FnYjlhN2Q1bGJqZG1ybml1MGd5N2Npc3BqZWdxN2JqLm9hc3QuZnVu
[INF] No results found. Better luck next time!