I also added support for per-chunk callbacks, for when you have a race condition that requires reading information from the server mid-attack like in LFI with PHPInfo Assistance. Ensuring every TCP connection was fully established before sending any requests reduced that window to 1.4ms, and the last-byte technique squeezed it to a tiny 0.7ms - making it roughly twice as effective at triggering race conditions. Using the basic five-thread approach caused an average difference of 2.7ms (0.0027 seconds). This repeatedly sent a batch of five requests over consumer-grade broadband to a public website and measured how close together the first and second requests hit the server. While developing this strategy I wrote a benchmark to ensure it was actually having the desired effect. To use this feature, just add a 'gate' argument when queuing your requests, and then invoke engine.openGate when you're ready to send them engine.queue(request, gate='race1')įor further details, check out the example script. I'm not sure who invented this technique - I first saw it years ago being used to improve timing attack accuracy - but it certainly works. This helps minimize the effect of network congestion and latency on our attempt to get multiple requests processed simultaneously. To address this, I added support for last-byte synchronization, where Turbo first sends the whole of every request except the last byte, then, when they're all ready, 'releases' each request by sending the last byte. However, Turbo Intruder was originally designed for total request throughput (requests per second), rather than making requests arrive simultaneously. I turned to Turbo Intruder, which uses a custom HTTP stack built from scratch with speed in mind. While researching HTTP Desync Attacks, I found I needed to send a group of HTTP requests within a tiny time window, to minimize the chance of someone else's request landing in the middle of my attack and interfering. This vulnerability was reported to Google 8 months ago but they declined to fix it, leaving the patching burden on individual websites. Tired of proving you're not a robot? In this post, I'll show how you can partially bypass Google reCAPTCHA by using a new Turbo Intruder feature to trigger a race condition. Director of 20 November 2019 at 14:59 UTC
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