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The Sleepy User Agent

Blog post from Cloudflare

Post Details
Company
Date Published
Author
John Graham-Cumming
Word Count
1,388
Company Posts That Month
14
Language
English
Hacker News Points
10
Post removed?
No
Summary

A customer recently inquired about simple GET requests for their homepage being blocked by the Cloudflare Web Application Firewall (WAF). The issue was traced back to a SQL injection attempt hidden within the User-Agent HTTP request header. This technique is commonly used by scanning tools and can be exploited to extract information from a website or gain access. To mitigate such attacks, it's crucial for web applications to sanitize input and employ security measures like Cloudflare's WAF.

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