websocket Read Limit Fix #1950
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websocket Read Limit Fix #1950
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This fix addresses a potential denial-of-service (DoS) vector that can cause an integer overflow in the presence of malicious WebSocket frames. The fix adds additional checks against the remaining bytes on a connection, as well as a test to prevent regression. Credit to Max Justicz (https://justi.cz/) for discovering and reporting this, as well as providing a robust PoC and review. * bugfix: fix DoS vector caused by readLimit bypass * bugfix: payload length 127 should read bytes as uint64 * bugfix: defend against readLength overflows
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This fix addresses a potential denial-of-service (DoS) vector that can cause an integer overflow in the presence of malicious WebSocket frames.
The fix adds additional checks against the remaining bytes on a connection, as well as a test to prevent regression.
Credit to Max Justicz (https://justi.cz/) for discovering and reporting this, as well as providing a robust PoC and review.