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Miggo AIRoot Cause AnalysisThe vulnerability description and the provided patch clearly identify readLongstr as the function responsible for the protocol desynchronization. Specifically, the vulnerability arises from an improper error-handling condition within readLongstr. When the length parameter, read from the AMQP stream, exceeded the maximum signed 32-bit integer, the function would execute a silent return statement. This meant it returned "", nil (an empty string and no error) without consuming the length bytes from the input stream. This left the unconsumed, malformed payload in the buffer, causing all subsequent read operations to become misaligned. The patch addresses this by changing the silent return to return "", ErrSyntax, which correctly signals an error and prevents the stream from becoming desynchronized. Therefore, readLongstr is the direct vulnerable function whose behavior led to the exploitation.
readLongstrread.go
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| github.com/rabbitmq/amqp091-go | go | < 1.13.0 | 1.13.0 |