GMAIL Authenticated Crawling & Filtering: xss0r vs Katana

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When performing authenticated crawling in bug bounty or penetration testing, targeting the right attack surface is critical. Traditional crawlers like Katana often pull excessive public (out-of-scope) endpoints, requiring manual cleanup. In contrast, xss0r streamlines the process by logging into Gmail and focusing only on valid targets within the authenticated session.

Key Differences:

  • Katana:
  • Crawls indiscriminately, including out-of-scope public URLs.
  • Requires manual filtering to remove irrelevant endpoints.
  • xss0r:
  • Authenticates into Gmail, crawling 240 relevant URLs in this test.
  • Automatically filters 10 unique out-of-scope URLs, saving hours of post-processing.
  • Focuses on hidden XSS and vulnerabilities behind login walls.

You Should Know:

Practical Commands for Web Crawling & XSS Testing

To replicate authenticated crawling and filtering, use these verified commands and techniques:

1. Authenticated Crawling with cURL

curl -u "email:password" -L "https://mail.google.com" -o gmail_session.html

– Stores the authenticated Gmail session for analysis.

2. Filtering URLs with grep

cat crawled_urls.txt | grep -E "mail.google.com\/inbox|mail.google.com\/compose" > filtered_urls.txt

– Extracts only in-scope Gmail endpoints.

3. Automated XSS Testing with xss0r

python3 xss0r.py -u https://mail.google.com -c "PHPSESSID=COOKIE_VALUE" --deep-crawl

– Performs authenticated XSS scanning within the session.

4. Katana Crawling (Baseline Comparison)

katana -u https://gmail.com -o katana_output.txt

– Crawls all links without authentication, requiring manual filtering.

5. Extracting Hidden Endpoints with Burp Suite

  • Configure Burp’s Session Handling Rules to maintain Gmail auth.
  • Use Burp Scanner to automate vulnerability detection.

6. Linux Command for Log Analysis

awk '{print $1}' access.log | sort | uniq -c | sort -nr

– Identifies most accessed endpoints for prioritization.

Expected Output:

A refined list of only in-scope, authenticated URLs, reducing noise and maximizing efficiency in bug hunting.

What Undercode Say:

Authenticated crawling is a game-changer in web security testing. Traditional tools like Katana lack session awareness, leading to wasted effort. xss0r’s approach ensures precision, targeting only valid attack surfaces.

For advanced testers, combining curl, grep, Burp Suite, and custom scripts can replicate this workflow. Always ensure proper authorization before scanning.

Prediction:

As web apps increasingly hide vulnerabilities behind authentication, tools like xss0r will dominate over traditional crawlers in bug bounty programs. Expect more innovations in session-aware security automation.

🔗 Relevant Links:

Expected Output:

filtered_urls.txt 
mail.google.com/inbox 
mail.google.com/compose 
mail.google.com/settings 
... (only authenticated, in-scope URLs)

References:

Reported By: Ibrahim Husi%C4%87 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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