| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/quic-go/quic-go | ≥ 0.38.0, < 0.38.2≥ 0.39.0, < 0.39.4≥ 0.40.0, < 0.40.1< 0.37.7 | 0.38.20.39.40.40.10.37.7 |
| quic-go | = 0.40.0≥ 0.38.0, < 0.38.2≥ 0.39.0, < 0.39.4< 0.37.7 | 0.38.20.39.40.37.7 |
An attacker can cause its peer to run out of memory sending a large number of PATH_CHALLENGE frames. The receiver is supposed to respond to each PATH_CHALLENGE frame with a PATH_RESPONSE frame. The attacker can prevent the receiver from sending out (the vast majority of) these PATH_RESPONSE frames by collapsing the peers congestion window (by selectively acknowledging received packets) and by manipulating the peer's RTT estimate.
I published a more detailed description of the attack and its mitigation in this blog post: https://seemann.io/posts/2023-12-18-exploiting-quics-path-validation/
There's no way to mitigate this attack, please update quic-go to a version that contains the fix.
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