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Labs Failing to Respond

John | Last updated: Jan 13, 2021 12:46PM UTC

Hi, I'm having issues with this lab,"Web cache poisoning to exploit a DOM vulnerability via a cache with strict cacheability criteria". As soon as I enter the X-Forwarded-Host header, the lab server fails to respond. I've tried this with Firefox and the in built chrome browser for burp Suite Pro. I also tried disabling all extensions and doing the lab without the Param Miner extension. The Lab server still hangs. I also waited for the lab to reset and it still hangs! The only thing I have not tried is uninstalling and re-installing Burp Suite Pro. Has anyone else seen this fault? I'm 162 labs deep, so I cannot bring myself to do an uninstall/re-install.

Uthman, PortSwigger Agent | Last updated: Jan 13, 2021 01:14PM UTC

Is your issue occurring at step 4 in the solution? I have just tested it and I do not appear to be seeing the same issue. Do you have two new lines at the end of your request like in the video below? - https://www.youtube.com/watch?v=oAiG-EVemUI

John | Last updated: Jan 14, 2021 02:49PM UTC

Hi I am completely dumbfounded!!! I got the lab working and solved it!!! My Primary device = iMacPro running macOSX 11.1 = Big Sur Wasted so much time trying to get the lab completed on that system, I decided to switch to my Windows 10 Laptop(Toshiba). Tried it with the inbuilt Chrome browser. All steps in the lab worked except...for solving it...put that down to me!! Then I thought, get Firefox on there, set it up to work through Burp Suite Pro. While I was doing that I set the proxy up for 127.0.0.1 port 8080. (Windows 10 Laptop) Then thought, see what the iMac is set to for its Firefox settings. I am a terrible typist and usually do lots of typos. That was set to localhost port 8080 (iMac Big Sur) I have no idea why I done this, probably just to set the laptop and iMac to exactly the same settings, I changed the iMac to 127.0.0.1 port 8080. Flew through the lab!! And Solved it!! I have no idea if that helps anyone else, I hope it does!! I would have thought either way to use the loopback would have been fine. If you find any technical reason for this, please let me know? Completely stunned!!

John | Last updated: Jan 14, 2021 09:31PM UTC

Take it all back...the strange fault is back! The next Lab asks for an "X:Forwarded-Host:" header. When I put one in, no response from Repeater when I press the send button. Weird!!

Uthman, PortSwigger Agent | Last updated: Jan 15, 2021 09:07AM UTC

Do you have two newlines at the end of the request? I cannot replicate this, unfortunately. Can you share the title of the next lab that fails?

John | Last updated: Jan 15, 2021 07:19PM UTC